[go: up one dir, main page]

US20120090254A1 - Method of forming flat strip stepped slab floor system of reinforced concrete - Google Patents

Method of forming flat strip stepped slab floor system of reinforced concrete Download PDF

Info

Publication number
US20120090254A1
US20120090254A1 US13/226,518 US201113226518A US2012090254A1 US 20120090254 A1 US20120090254 A1 US 20120090254A1 US 201113226518 A US201113226518 A US 201113226518A US 2012090254 A1 US2012090254 A1 US 2012090254A1
Authority
US
United States
Prior art keywords
strips
thickness
column
transitional
slab
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/226,518
Inventor
Venkata Rangarao Vemuri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of US20120090254A1 publication Critical patent/US20120090254A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/43—Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors

Definitions

  • the present invention generally relates to a field of reinforced concrete slab construction. More particularly the present invention is related to a flat strip slab system.
  • Beam-slab construction is the most popular floor system in reinforced concrete construction.
  • the conventional systems suffer from drawbacks of increased shuttering and insitu works, extensive rebar fabrication, congestion of column beam junctions which are structurally critical. Failures during earthquakes amply demonstrate the weakness of beam slab floor system present in the conventional system.
  • flat slabs or flat plates are a common alternatives to the beam slab floor system. Due to uniform thickness, flat slabs demand higher slab thickness resulting into higher dead weight and higher consumption of material thereby increasing the cost of a construction.
  • flat plate slabs illustrated in FIG. 1 rests directly on top of the columns which support them, wherein the flat plate slabs are subjected to large bending moments, shearing forces and the effect of these high shears and flexural stress can cause failure by “punching” of the slab at the column-slab junction. Inappropriate distribution of the material in the flat plate slab system offers less resistance against lateral loading. Further flexural Stress distribution in flat slabs indicates highly under utilization and concentration of moment peaks at a limited zone around columns. Such peak concentration at a few locations making the flat plate slab susceptible for early failures.
  • Wide beam-slab system illustrated in FIG. 2 is developed.
  • Wide beam and flat slab systems define column strip and rest of the slab area as depicted in FIG. 3 .
  • the series 1 represents flat slab system and series 2 represents wide beam system in FIG. 3 .
  • the improved wide beam and flat slab systems does not ensure smooth transfer of stresses and having a lower utility ratio as shown in FIG. 3 .
  • a column supported concrete slab disclosed in U.S. Pat. No. 4,406,103 described controlling the diagonal shear cracks in the vicinity of the column zone by providing specific inserts in the both intent and content of the patent under reference is differ from the present invention in terms of transitional strips to enable normalizing the stress peaks between column strips and middle strips accordingly the present invention leads to stepped slab, whereas stepped slab of linear strips forming closed boundaries.
  • the embodiments described in U.S. Pat. No. 4,406,103 in concrete deals with a conventional flat slab which includes uniform thickness. Flat slab requires higher slab thickness resulting into higher dead weight and higher consumption of material thereby increasing the cost of a construction.
  • a system and a method for a reinforced concrete slab are disclosed.
  • a system for a reinforced concrete slab includes a plurality of column strips of a predefined thickness positioned on a plurality of columns.
  • the system for a reinforced concrete slab includes a plurality of transitional strips positioned adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips.
  • the system for a reinforced concrete slab includes a central panel bound by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • a system for a reinforced concrete slab includes a plurality of column steps positioned in between the plurality of columns and the plurality of column strips.
  • a method for a reinforced concrete slab includes positioning a plurality of column strips of predefined thickness on a plurality of columns.
  • the method for a reinforced concrete slab includes positioning a plurality of transitional strips adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips.
  • a step of varying the thickness of the strips at a predefined regular interval enables the optimal distribution of stresses in the reinforced concrete slab.
  • the method for a reinforced concrete slab includes bounding a central panel by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • a method for a reinforced concrete slab includes positioning a plurality of column steps in between the plurality of columns and the plurality of column strips.
  • FIG. 1 is a diagram depicting a typical part plan of a conventional flat slab system.
  • FIG. 2 is a diagram depicting a typical part plan of a conventional wide beam slab system.
  • FIG. 3 is a diagram depicting a graphical representation of utility ratio in conventional slab systems.
  • FIG. 4 is a diagram depicting a typical part plan of a flat strip slab system.
  • FIG. 5 is a diagram depicting a typical part plan of a flat strip slab system with multiple column steps.
  • FIG. 6 is a diagram depicting a cross sectional view of a flat strip slab system through a central panel.
  • FIG. 7 a is a diagram depicting a cross sectional view of a flat strip slab system with multiple column steps.
  • FIG. 7 b is a diagram depicting a cross sectional view of a column steps
  • FIG. 8 is a diagram depicting an overview of a flat strip slab system.
  • FIG. 9 is a diagram depicting a graphical representation of utility ratio in different slab systems.
  • Exemplary embodiments of the present invention are directed towards a system and a method for a reinforced concrete slab.
  • a system for the reinforced concrete slab includes a plurality of column strips of a predefined thickness positioned on a plurality of columns.
  • the system for a reinforced concrete slab includes a plurality of transitional strips positioned adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips.
  • the system for a reinforced concrete slab includes a central panel bound by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • a system for a reinforced concrete slab includes a plurality of column steps positioned in between the plurality of columns and the plurality of column strips.
  • a method for a reinforced concrete slab includes positioning a plurality of column strips of predefined thickness on a plurality of columns.
  • the method for a reinforced concrete slab includes positioning a plurality of transitional strips adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips.
  • a step of varying the thickness of the strips at a predefined regular interval enables the optimal distribution of stresses in the reinforced concrete slab.
  • the method for a reinforced concrete slab includes bounding a central panel by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • a method for a reinforced concrete slab includes positioning a plurality of column steps in between the plurality of columns and the plurality of column strips.
  • a system for a reinforced concrete slab includes multiple columns 402 a, 402 b, 402 c and 402 d , multiple column strips 404 a, 404 b, 404 c and 404 d, multiple transitional strips 406 a, 406 b, 406 c and 406 d and a central panel 408 bound by multiple transitional strips 406 a, 406 b, 406 c, 406 d.
  • the column strips 404 a, 404 b, 404 c and 404 d of a predefined thickness are positioned on the columns 402 a, 402 b , 402 c and 402 d.
  • the transitional strips 406 a, 406 b, 406 c and 406 d are positioned adjacent to the column strips 404 a, 404 b, 404 c and 404 d.
  • the thickness of the transitional strips 406 a, 406 b , 406 c and 406 d is comparatively less than the predefined thickness of the column strips 404 a , 404 b, 404 c and 404 d.
  • the central panel 408 is bounded by the transitional strips 406 a, 406 b , 406 c and 406 d.
  • the thickness of the central panel 408 is comparatively less than the thickness of the transitional strips 406 a, 406 b, 406 c and 406 d.
  • the thickness of the slab is varied from the column strips 404 a, 404 b, 404 c and 404 d to the central panel 408 for enabling the optimal distribution of stresses in the reinforced concrete slab and also for an efficient utilization of the structural sections provided on the reinforced concrete slab.
  • a system for a reinforced concrete slab includes multiple columns 502 a, 502 b , 502 c and 502 d, multiple column steps 504 a, 504 b, 504 c and 504 d, multiple column strips 506 a , 506 b, 506 c and 506 d, multiple transitional strips 508 a, 508 b, 508 c and 508 d and a central panel 520 bound by the multiple transitional strips 508 a, 508 b, 508 c and 508 d.
  • FIG. 6 is a diagram 600 depicting a cross sectional view of a flat strip slab system through central panel.
  • the cross sectional view of the flat strip slab system depicts multiple columns 602 a and 602 b, multiple column strips 604 a and 604 b, multiple transitional strips 606 a and 606 b and a central panel 608 .
  • the column strips 604 a and 604 b of a predefined thickness are positioned on the columns 602 a and 602 b.
  • the transitional strips 606 a and 606 b are positioned adjacent to the column strips 604 a and 604 b.
  • the thickness of the transitional strips 606 a and 606 b is comparatively less than the predefined thickness of the column strips 604 a and 604 b.
  • the central panel 608 is bound by the transitional strips 606 a and 606 b.
  • the thickness of the central panel 608 is comparatively less than the thickness of the transitional strips 606 a and 606 b.
  • FIG. 7 a is a diagram 700 a depicting a cross sectional view of a flat strip slab system with multiple column steps through a column strip.
  • the cross sectional view of a flat strip slab with multiple column steps depicts multiple columns 702 a and 702 b, multiple column steps 704 a , 704 b and a column strip 706 .
  • the columns strip 706 of a predefined thickness is positioned on columns 702 a and 702 b.
  • the multiple column steps 704 a and 704 b are positioned in between the columns 702 a and 702 b and the column strip 706 to achieve an optimal distribution of stresses in the reinforced concrete flat strip slab.
  • FIG. 7 b is a diagram 700 b depicting a cross sectional view of a column steps.
  • the cross sectional view of a column steps depicts a column 702 , a column steps 704 , and a slab cast portion 708 .
  • the column steps 704 is positioned in between the column 702 and the slab cast portion 708 to achieve the optimal distribution of stresses in the reinforced concrete flat strip slab.
  • the slab cast portion 708 is positioned over column steps 704 .
  • FIG. 8 is a diagram 800 depicting an overview of a flat strip slab system.
  • the overview of a flat strip slab system depicts a column strip 802 , a transitional strip 804 and a central panel 806 .
  • the column strip 802 of a predefined thickness is positioned on the columns.
  • the transitional strip 804 is positioned adjacent to the column strip 802 .
  • the thickness of the transitional strip 804 is comparatively less than the predefined thickness of the column strip 802 .
  • the central panel 806 is bound by the transitional strips 804 .
  • the thickness of the central panel 806 is comparatively less than the thickness of the transitional strip.
  • the thickness of the slab is varied from the column strips 802 to the central panel 806 for enabling the optimal distribution of stresses in the reinforced concrete slab and for an efficient utilization of the structural sections provided.
  • FIG. 9 is a diagram 900 depicting a graphical representation of utility ratio in different slab systems.
  • the graphical representation of ratio in different slab systems is depicted in series 1 , series 2 and series 3 .
  • utility ratio is taken as a ratio of applied average moment to moment of resistance of section under reference using consistence units as shown in a flat strip slab system as ability to achieve higher utility ratio against to flat slab system and wide beam system.
  • series 1 represents a flat strip slab system
  • series 2 represents a flat slab system
  • series 3 represents a wide beam system.
  • Span location taken along x-axis and the utility ratio is taken along Y-axis and a graph is plotted for the flat strip slab system, the flat slab system and wide beam system. The graph shows higher utility ratio in the flat strip slab system when compared with the flat slab system and the wide beam system.
  • the plot between the span location 1 and the span location 3 represents the utility ratio of a column strip
  • the plot between the span location 3 and the span location 4 represents the utility ratio of a transitional strip
  • the plot between the span location 4 and the span location 10 represents the utility ratio of a middle strip
  • the plot between the span location 10 and the span location 11 represents the utility ratio of the transitional strip
  • the plot between the span location 11 and the span location 13 represents the utility ratio of the column strip in the flat strip slab system, the flat slab system and the wide beam system.
  • the purpose of transitional strip in the flat strip slab system is to smoothen out stress peaks between column strip and middle strip. This feature make rove appropriate to improve lateral force resisting ability of slabs particularly an encountered with rigid shear walls where stress peaks are very high.
  • the present invention provides a variety of advantages. Firstly, the invention is designed for all possible load cases of both gravity and lateral loads. Secondly, the invention provides an efficient stress leveling with optimal distribution of stresses. Thirdly, the flat strip slabs consumes less amount of concrete compared to the other conventional systems. Fourthly, the invention provides an economical and elegant alternative to the conventional floor systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

A system and a method for a reinforced concrete slab are disclosed. The system includes a plurality of column strips of a predefined thickness positioned on a plurality of columns, a plurality of transitional strips positioned adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips, a central panel bound by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips and a plurality of column steps positioned in between the plurality of columns and the plurality of column strips.

Description

    TECHNICAL FIELD OF THE INVENTION
  • The present invention generally relates to a field of reinforced concrete slab construction. More particularly the present invention is related to a flat strip slab system.
    • BACKGROUND OF THE INVENTION
  • Beam-slab construction is the most popular floor system in reinforced concrete construction. The conventional systems suffer from drawbacks of increased shuttering and insitu works, extensive rebar fabrication, congestion of column beam junctions which are structurally critical. Failures during earthquakes amply demonstrate the weakness of beam slab floor system present in the conventional system.
  • Typically, flat slabs or flat plates are a common alternatives to the beam slab floor system. Due to uniform thickness, flat slabs demand higher slab thickness resulting into higher dead weight and higher consumption of material thereby increasing the cost of a construction.
  • Generally, flat plate slabs illustrated in FIG. 1 rests directly on top of the columns which support them, wherein the flat plate slabs are subjected to large bending moments, shearing forces and the effect of these high shears and flexural stress can cause failure by “punching” of the slab at the column-slab junction. Inappropriate distribution of the material in the flat plate slab system offers less resistance against lateral loading. Further flexural Stress distribution in flat slabs indicates highly under utilization and concentration of moment peaks at a limited zone around columns. Such peak concentration at a few locations making the flat plate slab susceptible for early failures.
  • Based on forgone experiences with the above systems, in order to overcome some design deficiencies, wide beam-slab system illustrated in FIG. 2 is developed. Wide beam and flat slab systems define column strip and rest of the slab area as depicted in FIG. 3. The series 1 represents flat slab system and series 2 represents wide beam system in FIG. 3. The improved wide beam and flat slab systems does not ensure smooth transfer of stresses and having a lower utility ratio as shown in FIG. 3.
  • A column supported concrete slab disclosed in U.S. Pat. No. 4,406,103 described controlling the diagonal shear cracks in the vicinity of the column zone by providing specific inserts in the both intent and content of the patent under reference is differ from the present invention in terms of transitional strips to enable normalizing the stress peaks between column strips and middle strips accordingly the present invention leads to stepped slab, whereas stepped slab of linear strips forming closed boundaries. The embodiments described in U.S. Pat. No. 4,406,103 in concrete deals with a conventional flat slab which includes uniform thickness. Flat slab requires higher slab thickness resulting into higher dead weight and higher consumption of material thereby increasing the cost of a construction.
  • Hence there exists a need for a system and a method to achieve an optimized slab system for an optimal distribution of stresses, possible improvement under lateral loading and efficient utilization of material in a reinforced concrete slab.
    • BRIEF SUMMARY OF THE INVENTION
  • A system and a method for a reinforced concrete slab are disclosed. According to a first aspect of the present invention, a system for a reinforced concrete slab includes a plurality of column strips of a predefined thickness positioned on a plurality of columns.
  • According to the first aspect of the present invention, the system for a reinforced concrete slab includes a plurality of transitional strips positioned adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips.
  • According to the first aspect of the present invention, the system for a reinforced concrete slab includes a central panel bound by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • According to a second aspect of a present invention, a system for a reinforced concrete slab is disclosed. According to the second aspect of the present invention, the system for a reinforced concrete slab includes a plurality of column steps positioned in between the plurality of columns and the plurality of column strips.
  • According to a third aspect of a present invention, a method for a reinforced concrete slab is disclosed. According to the third aspect of the present invention, the method for a reinforced concrete slab includes positioning a plurality of column strips of predefined thickness on a plurality of columns.
  • According to the third aspect of the present invention, the method for a reinforced concrete slab includes positioning a plurality of transitional strips adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips. A step of varying the thickness of the strips at a predefined regular interval enables the optimal distribution of stresses in the reinforced concrete slab.
  • According to the third aspect of the present invention, the method for a reinforced concrete slab includes bounding a central panel by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • According to a fourth aspect of a present invention, a method for a reinforced concrete slab is disclosed. According to the fourth aspect of the present invention, the method for a reinforced concrete slab includes positioning a plurality of column steps in between the plurality of columns and the plurality of column strips.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Other objects and advantages of the present invention will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments, in conjunction with the accompanying drawings, wherein like reference numerals have been used to designate like elements, and wherein:
  • FIG. 1 is a diagram depicting a typical part plan of a conventional flat slab system.
  • FIG. 2 is a diagram depicting a typical part plan of a conventional wide beam slab system.
  • FIG. 3 is a diagram depicting a graphical representation of utility ratio in conventional slab systems.
  • FIG. 4 is a diagram depicting a typical part plan of a flat strip slab system.
  • FIG. 5 is a diagram depicting a typical part plan of a flat strip slab system with multiple column steps.
  • FIG. 6 is a diagram depicting a cross sectional view of a flat strip slab system through a central panel.
  • FIG. 7 a is a diagram depicting a cross sectional view of a flat strip slab system with multiple column steps.
  • FIG. 7 b is a diagram depicting a cross sectional view of a column steps
  • FIG. 8 is a diagram depicting an overview of a flat strip slab system.
  • FIG. 9 is a diagram depicting a graphical representation of utility ratio in different slab systems.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • It is to be understood that the present disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. The present disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
  • The use of “including”, “comprising” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. The terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. Further, the use of terms “first”, “second”, and “third”, and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
  • Exemplary embodiments of the present invention are directed towards a system and a method for a reinforced concrete slab. According to a first aspect of a present invention, a system for the reinforced concrete slab includes a plurality of column strips of a predefined thickness positioned on a plurality of columns.
  • According to the first aspect of the present invention, the system for a reinforced concrete slab includes a plurality of transitional strips positioned adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips.
  • According to the first aspect of the present invention, the system for a reinforced concrete slab includes a central panel bound by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • According to a second aspect of a present invention, a system for a reinforced concrete slab is disclosed. According to the second aspect of the present invention, the system for a reinforced concrete slab includes a plurality of column steps positioned in between the plurality of columns and the plurality of column strips.
  • According to a third aspect of a present invention, a method for a reinforced concrete slab is disclosed. According to the third aspect of the present invention, the method for a reinforced concrete slab includes positioning a plurality of column strips of predefined thickness on a plurality of columns.
  • According to the third aspect of the present invention, the method for a reinforced concrete slab includes positioning a plurality of transitional strips adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips. A step of varying the thickness of the strips at a predefined regular interval enables the optimal distribution of stresses in the reinforced concrete slab.
  • According to the third aspect of the present invention, the method for a reinforced concrete slab includes bounding a central panel by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
  • According to a fourth aspect of a present invention, a method for a reinforced concrete slab is disclosed. According to the fourth aspect of the present invention, the method for a reinforced concrete slab includes positioning a plurality of column steps in between the plurality of columns and the plurality of column strips.
  • Referring to FIG. 4 is a diagram 400 depicting a typical part plan of a flat strip slab system. In accordance with a non limiting exemplary embodiment of the present invention, a system for a reinforced concrete slab includes multiple columns 402 a, 402 b, 402 c and 402 d, multiple column strips 404 a, 404 b, 404 c and 404 d, multiple transitional strips 406 a, 406 b, 406 c and 406 d and a central panel 408 bound by multiple transitional strips 406 a, 406 b, 406 c, 406 d.
  • In accordance with an exemplary embodiment of the present invention, the column strips 404 a, 404 b, 404 c and 404 d of a predefined thickness are positioned on the columns 402 a, 402 b, 402 c and 402 d. The transitional strips 406 a, 406 b, 406 c and 406 d are positioned adjacent to the column strips 404 a, 404 b, 404 c and 404 d. The thickness of the transitional strips 406 a, 406 b, 406 c and 406 d is comparatively less than the predefined thickness of the column strips 404 a, 404 b, 404 c and 404 d. The central panel 408 is bounded by the transitional strips 406 a, 406 b, 406 c and 406 d. The thickness of the central panel 408 is comparatively less than the thickness of the transitional strips 406 a, 406 b, 406 c and 406 d.
  • According to a non limiting exemplary embodiment of the present invention, the thickness of the slab is varied from the column strips 404 a, 404 b, 404 c and 404 d to the central panel 408 for enabling the optimal distribution of stresses in the reinforced concrete slab and also for an efficient utilization of the structural sections provided on the reinforced concrete slab.
  • Referring to FIG. 5 is a diagram 500 depicting a typical part plan of a flat strip slab system with multiple column steps. In accordance with a non limiting exemplary embodiment of the present invention, a system for a reinforced concrete slab includes multiple columns 502 a, 502 b, 502 c and 502 d, multiple column steps 504 a, 504 b, 504 c and 504 d, multiple column strips 506 a, 506 b, 506 c and 506 d, multiple transitional strips 508 a, 508 b, 508 c and 508 d and a central panel 520 bound by the multiple transitional strips 508 a, 508 b, 508 c and 508 d.
  • Referring FIG. 6 is a diagram 600 depicting a cross sectional view of a flat strip slab system through central panel. In accordance with a non limiting exemplary embodiment of the present invention, the cross sectional view of the flat strip slab system depicts multiple columns 602 a and 602 b, multiple column strips 604 a and 604 b, multiple transitional strips 606 a and 606 b and a central panel 608.
  • In accordance with an exemplary embodiment of the present invention, the column strips 604 a and 604 b of a predefined thickness are positioned on the columns 602 a and 602 b. The transitional strips 606 a and 606 b are positioned adjacent to the column strips 604 a and 604 b. The thickness of the transitional strips 606 a and 606 b is comparatively less than the predefined thickness of the column strips 604 a and 604 b. The central panel 608 is bound by the transitional strips 606 a and 606 b. The thickness of the central panel 608 is comparatively less than the thickness of the transitional strips 606 a and 606 b.
  • Referring to FIG. 7 a is a diagram 700 a depicting a cross sectional view of a flat strip slab system with multiple column steps through a column strip. In accordance with a non limiting exemplary embodiment of the present invention, the cross sectional view of a flat strip slab with multiple column steps depicts multiple columns 702 a and 702 b, multiple column steps 704 a, 704 b and a column strip 706.
  • In accordance with an exemplary embodiment of the present invention, the columns strip 706 of a predefined thickness is positioned on columns 702 a and 702 b. The multiple column steps 704 a and 704 b are positioned in between the columns 702 a and 702 b and the column strip 706 to achieve an optimal distribution of stresses in the reinforced concrete flat strip slab.
  • Referring to FIG. 7 b is a diagram 700 b depicting a cross sectional view of a column steps. In accordance with a non limiting exemplary embodiment of the present invention, the cross sectional view of a column steps depicts a column 702, a column steps 704, and a slab cast portion 708.
  • In accordance with an exemplary embodiment of the present invention, the column steps 704 is positioned in between the column 702 and the slab cast portion 708 to achieve the optimal distribution of stresses in the reinforced concrete flat strip slab. The slab cast portion 708 is positioned over column steps 704.
  • Referring FIG. 8 is a diagram 800 depicting an overview of a flat strip slab system. In accordance with a non limiting exemplary embodiment of the present invention, the overview of a flat strip slab system depicts a column strip 802, a transitional strip 804 and a central panel 806.
  • In accordance with an exemplary embodiment of the present invention, the column strip 802 of a predefined thickness is positioned on the columns. The transitional strip 804 is positioned adjacent to the column strip 802. The thickness of the transitional strip 804 is comparatively less than the predefined thickness of the column strip 802. The central panel 806 is bound by the transitional strips 804. The thickness of the central panel 806 is comparatively less than the thickness of the transitional strip.
  • According to a non limiting exemplary embodiment of the present invention, the thickness of the slab is varied from the column strips 802 to the central panel 806 for enabling the optimal distribution of stresses in the reinforced concrete slab and for an efficient utilization of the structural sections provided.
  • Referring FIG. 9 is a diagram 900 depicting a graphical representation of utility ratio in different slab systems. In accordance with a non limiting exemplary embodiment of the present invention, the graphical representation of ratio in different slab systems is depicted in series 1, series 2 and series 3.
  • In accordance with an exemplary embodiment of the present invention, utility ratio is taken as a ratio of applied average moment to moment of resistance of section under reference using consistence units as shown in a flat strip slab system as ability to achieve higher utility ratio against to flat slab system and wide beam system.
  • In accordance with an exemplary embodiment of the present invention, series 1 represents a flat strip slab system, series 2 represents a flat slab system and series 3 represents a wide beam system. Span location taken along x-axis and the utility ratio is taken along Y-axis and a graph is plotted for the flat strip slab system, the flat slab system and wide beam system. The graph shows higher utility ratio in the flat strip slab system when compared with the flat slab system and the wide beam system. The plot between the span location 1 and the span location 3 represents the utility ratio of a column strip, the plot between the span location 3 and the span location 4 represents the utility ratio of a transitional strip, the plot between the span location 4 and the span location 10 represents the utility ratio of a middle strip, the plot between the span location 10 and the span location 11 represents the utility ratio of the transitional strip and the plot between the span location 11 and the span location 13 represents the utility ratio of the column strip in the flat strip slab system, the flat slab system and the wide beam system.
  • According to a non limiting exemplary embodiment of the present invention, the purpose of transitional strip in the flat strip slab system is to smoothen out stress peaks between column strip and middle strip. This feature make rove appropriate to improve lateral force resisting ability of slabs particularly an encountered with rigid shear walls where stress peaks are very high.
  • As will be appreciated by a person skilled in the art the present invention provides a variety of advantages. Firstly, the invention is designed for all possible load cases of both gravity and lateral loads. Secondly, the invention provides an efficient stress leveling with optimal distribution of stresses. Thirdly, the flat strip slabs consumes less amount of concrete compared to the other conventional systems. Fourthly, the invention provides an economical and elegant alternative to the conventional floor systems.
  • While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

Claims (5)

1. A reinforced concrete slab system, comprising:
a plurality of column strips of a predefined thickness positioned on a plurality of columns;
a plurality of transitional strips positioned adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips; and
a central panel bound by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
2. A system for a reinforced concrete slab, comprising:
a plurality of column strips of a predefined thickness positioned on a plurality of columns;
a plurality of transitional strips positioned adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips;
a central panel bound by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips; and
a plurality of column steps positioned in between the plurality of columns and the plurality of column strips;
3. A method for a reinforced concrete slab, comprising:
positioning a plurality of column strips of predefined thickness on a plurality of columns;
positioning a plurality of transitional strips adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips; and
bounding a central panel by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips.
4. The method of claim 4, wherein a step of varying the thickness of the strips at a predefined regular interval enables the optimal distribution of stresses in the reinforced concrete slab.
5. A method for a reinforced concrete slab, comprising:
positioning a plurality of column strips of predefined thickness on a plurality of columns;
positioning a plurality of transitional strips adjacent to the plurality of column strips, whereby a thickness of the plurality of transitional strips comparatively less than the predefined thickness of the plurality of column strips;
bounding a central panel by the plurality of transitional strips, whereby the thickness of the central panel comparatively less than the thickness of the plurality of transitional strips; and
positioning a plurality of column steps in between the plurality of columns and the plurality of column strips.
US13/226,518 2010-10-14 2011-09-07 Method of forming flat strip stepped slab floor system of reinforced concrete Abandoned US20120090254A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN3046CH2010 2010-10-14
IN3046/CHE/2010 2010-10-14

Publications (1)

Publication Number Publication Date
US20120090254A1 true US20120090254A1 (en) 2012-04-19

Family

ID=45932859

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/226,518 Abandoned US20120090254A1 (en) 2010-10-14 2011-09-07 Method of forming flat strip stepped slab floor system of reinforced concrete

Country Status (1)

Country Link
US (1) US20120090254A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130175102A1 (en) * 2010-09-30 2013-07-11 Honda Motor Co., Ltd. Swing arm device for electric two- or three-wheeled vehicle

Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3138899A (en) * 1959-10-15 1964-06-30 Homer M Hadley Structurally integrated composite members
US3283458A (en) * 1958-02-25 1966-11-08 Gersovitz Benjamin Shear reinforcement in reinforced concrete floor systems
US3290845A (en) * 1965-05-24 1966-12-13 Butler Manufacturing Co Prefabricated insulated panel system
US3307304A (en) * 1964-06-02 1967-03-07 Edward S Klausner Composite structural systems
US3762115A (en) * 1971-04-26 1973-10-02 Schokbeton Products Corp Multilevel concrete building of precast modular units
US4211043A (en) * 1978-01-06 1980-07-08 Coday Jerry F Precast concrete building module form
US4333280A (en) * 1978-08-23 1982-06-08 Verco Manufacturing, Inc. Shear load resistant structure
US4406103A (en) * 1978-02-28 1983-09-27 Amin Ghali Shear reinforcement for concrete flat slabs
US4604841A (en) * 1983-04-01 1986-08-12 Barnoff Robert M Continuous, precast, prestressed concrete bridge deck panel forms, precast parapets, and method of construction
US4606167A (en) * 1984-10-31 1986-08-19 Parker Thorne Fabricated round interior column and method of construction
US4646493A (en) * 1985-04-03 1987-03-03 Keith & Grossman Leasing Co. Composite pre-stressed structural member and method of forming same
US5218795A (en) * 1987-08-07 1993-06-15 Horstketter Eugene A Concrete panels, concrete decks, parts thereof, and apparatus and methods for their fabrication and use
US5412913A (en) * 1993-05-28 1995-05-09 Fluor Corporation Self-aligning beam joint suited for use in modular construction
US5749199A (en) * 1996-09-19 1998-05-12 Bale Built, Inc. Fiber bale composite structural building system
US5941035A (en) * 1997-09-03 1999-08-24 Mega Building System Ltd. Steel joist and concrete floor system
US6145270A (en) * 1997-06-24 2000-11-14 Hillman; John Plasticon-optimized composite beam system
US6568139B2 (en) * 2000-04-20 2003-05-27 Bot Construction Limited Bridge structure with concrete deck having precast slab
US6658799B1 (en) * 1998-10-20 2003-12-09 William Richard Charles Stoodley Volumetric modular building system
US7017314B2 (en) * 2002-07-17 2006-03-28 Pace Malcolm J Apparatus and method for composite concrete and steel floor construction
US7389620B1 (en) * 2004-08-19 2008-06-24 Mcmanus Ira J Composite pan for composite beam-joist construction
US7497054B2 (en) * 2001-06-06 2009-03-03 Nippon Steel Corporation Column-and-beam join structure
US7562499B2 (en) * 2006-01-13 2009-07-21 HC Bridge Company, LLC Hybrid composite beam system
US7882669B2 (en) * 2006-05-18 2011-02-08 Ping Qu Composite concrete shear wall for heat insulation

Patent Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283458A (en) * 1958-02-25 1966-11-08 Gersovitz Benjamin Shear reinforcement in reinforced concrete floor systems
US3138899A (en) * 1959-10-15 1964-06-30 Homer M Hadley Structurally integrated composite members
US3307304A (en) * 1964-06-02 1967-03-07 Edward S Klausner Composite structural systems
US3290845A (en) * 1965-05-24 1966-12-13 Butler Manufacturing Co Prefabricated insulated panel system
US3762115A (en) * 1971-04-26 1973-10-02 Schokbeton Products Corp Multilevel concrete building of precast modular units
US4211043A (en) * 1978-01-06 1980-07-08 Coday Jerry F Precast concrete building module form
US4406103A (en) * 1978-02-28 1983-09-27 Amin Ghali Shear reinforcement for concrete flat slabs
US4333280A (en) * 1978-08-23 1982-06-08 Verco Manufacturing, Inc. Shear load resistant structure
US4604841A (en) * 1983-04-01 1986-08-12 Barnoff Robert M Continuous, precast, prestressed concrete bridge deck panel forms, precast parapets, and method of construction
US4606167A (en) * 1984-10-31 1986-08-19 Parker Thorne Fabricated round interior column and method of construction
US4646493A (en) * 1985-04-03 1987-03-03 Keith & Grossman Leasing Co. Composite pre-stressed structural member and method of forming same
US5218795A (en) * 1987-08-07 1993-06-15 Horstketter Eugene A Concrete panels, concrete decks, parts thereof, and apparatus and methods for their fabrication and use
US5412913A (en) * 1993-05-28 1995-05-09 Fluor Corporation Self-aligning beam joint suited for use in modular construction
US5749199A (en) * 1996-09-19 1998-05-12 Bale Built, Inc. Fiber bale composite structural building system
US6145270A (en) * 1997-06-24 2000-11-14 Hillman; John Plasticon-optimized composite beam system
US5941035A (en) * 1997-09-03 1999-08-24 Mega Building System Ltd. Steel joist and concrete floor system
US6658799B1 (en) * 1998-10-20 2003-12-09 William Richard Charles Stoodley Volumetric modular building system
US6568139B2 (en) * 2000-04-20 2003-05-27 Bot Construction Limited Bridge structure with concrete deck having precast slab
US7497054B2 (en) * 2001-06-06 2009-03-03 Nippon Steel Corporation Column-and-beam join structure
US7017314B2 (en) * 2002-07-17 2006-03-28 Pace Malcolm J Apparatus and method for composite concrete and steel floor construction
US7389620B1 (en) * 2004-08-19 2008-06-24 Mcmanus Ira J Composite pan for composite beam-joist construction
US7562499B2 (en) * 2006-01-13 2009-07-21 HC Bridge Company, LLC Hybrid composite beam system
US7882669B2 (en) * 2006-05-18 2011-02-08 Ping Qu Composite concrete shear wall for heat insulation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130175102A1 (en) * 2010-09-30 2013-07-11 Honda Motor Co., Ltd. Swing arm device for electric two- or three-wheeled vehicle
US8893833B2 (en) * 2010-09-30 2014-11-25 Honda Motor Co., Ltd. Swing arm device for electric two- or three-wheeled vehicle

Similar Documents

Publication Publication Date Title
Foraboschi et al. Sustainable structural design of tall buildings based on embodied energy
Marimuthu et al. Experimental studies on composite deck slabs to determine the shear-bond characteristic (m–k) values of the embossed profiled sheet
Lindsay et al. Experiments on the seismic performance of hollow-core floor systems in precast concrete buildings
US20190010700A1 (en) Composite structural member for a building structure
EP2900882B1 (en) Composite steel joist
Kang et al. Seismic performance of reinforced concrete slab-column connections with thin plate stirrups
JP2014521852A (en) Combined pre-embedded anchor slot device
Abdul-Razzaq et al. Innovative use of steel plates to strengthen flange openings in reinforced concrete T-beams
US20120090254A1 (en) Method of forming flat strip stepped slab floor system of reinforced concrete
CN209942050U (en) Adjustable interim reinforcing bar split heads that can have enough to meet need of high strength for big cross-section roof beam
Patil et al. flat slab construction in India
Nie et al. Experimental and theoretical study of steel–concrete composite beams with openings in concrete flange
CN115233865B (en) Assembled buckling restrained steel plate shear wall structure with self-resetting function
Aalami et al. Guidelines for the design of post-tensioned floors
US9464437B1 (en) Precast I-beam concrete panels
Abdelaziz et al. Cost evaluation of post-tensioned slabs in multi-storey buildings considering seismic effect
CN111705916B (en) Structure system for eliminating irregular items of building body type and design method thereof
CN207314518U (en) One kind is exempted to support layered assembling type steel structure
CN207392553U (en) A kind of assembly concrete floor
CN219793594U (en) A beam structure without web reinforcement reinforced by vertical steel plates arranged at intervals in the length direction
US12291868B2 (en) Retrofitting method for a beam with an opening
US20100050565A1 (en) Flat strip slab system
CN221461471U (en) A high-strength and high-ductility plate-column joint
Kikani et al. A Comparative Review on Behavioural Aspect of Post-Tensioning Voided Flat Slab With Other Slab Systems
Bamaga et al. Push tests on innovative shear connector for composite beam with cold-formed steel section

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION