JPH0531621B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a steel reinforced concrete column.

"Problems to be solved by conventional technology and invention" In high-rise buildings made of steel-framed reinforced concrete,
In cases where earthquake-resistant elements such as earthquake-resistant walls are installed in one direction, or in the case of a tube structure, steel columns with an H-shaped cross section are used as shown in Figure 6, with the aim of reducing the amount of steel and improving workability. Steel reinforced concrete columns will be used. That is, reinforcement 2 is arranged around a steel column 1 with an H-shaped cross section by column main reinforcements 21 and hoop reinforcements 22.
It is constructed by pouring concrete 3 and relying solely on hoop reinforcements 22 on the outer periphery to restrain the concrete in one direction a.

However, in such a reinforcement arrangement 2, the column main reinforcement 21 in the middle part itself is not sufficiently restrained, and
Since the concrete 3 is divided by the web 11 of the steel column 1, when subjected to large bending shear force under high axial force during a severe earthquake, the main column reinforcements 21... bulge and buckle, causing the concrete 3 to break down prematurely. may be crushed.

The present invention attempts to solve these conventional problems.

"Means for Solving the Problems" The present invention provides reinforcement consisting of a plurality of corner and intermediate column main reinforcements and a large number of hoop reinforcements around a steel column with an H-shaped cross section, and uses the reinforcement arrangement to perform driving. In a steel reinforced concrete column with concrete restrained, a large number of through holes with a larger diameter than the core hoop reinforcement to be inserted are arranged in the web of the steel column in several rows in the longitudinal direction at the middle part of the web width direction, In addition, core hoop reinforcements are arranged at a predetermined pitch, and core hoop reinforcements are loosely inserted into these through holes, and intermediate column main reinforcements corresponding to the web are further restrained by these core hoop reinforcements.

Note that high-strength or ultra-high-strength concrete may be used as the concrete.

``Function'' Because of the above configuration, the intermediate column main reinforcement restrained by the core hoop reinforcement sufficiently restrains the core concrete in the central part divided by the web of the steel column. Improves the restraining properties of core concrete.

In addition, a large number of through holes with a diameter larger than the core hoop reinforcement drilled in the web integrate the concrete that had been divided by the web of the steel column.

Therefore, the restraint and integration of the concrete on both sides of the web greatly improves the concrete retention performance under high axial force, and prevents the concrete from expanding in the circumferential direction due to large axial force and thereby reducing the axial strength. This prevents loss as much as possible, dramatically improves the deformation ability against bending shear force under high axial force, and prevents column buckling as much as possible.

Embodiment FIGS. 1 to 3 show a first embodiment of the present invention.

The illustrated example is a steel-framed reinforced concrete column in which reinforcement 2 is provided around a steel-framed column 1 with an H-shaped cross section by a plurality of main column reinforcements 21 and hoop reinforcements 22, and concrete 3 is poured. A large number of through holes 12 with a diameter of about 100 mm are provided in the web 11 of the pillar 1...
are arranged in a staggered manner, and U-shaped core hoop muscles 4 are inserted alternately from both sides into these through holes and connected to form a continuous spiral hoop. Column main reinforcement 21... and core concrete 3 are restrained.

Core hoop reinforcement 4... Although the joint between the core hoop reinforcements is basically a lap joint which is easy to construct, the length of the joint can be shortened by using a welded joint or a mechanical joint. Furthermore, in the case of welded joints, it is preferable to overlap them on the outside of the through holes 12 for convenience of welding.

The core hoop reinforcements 4 may be installed in advance at a steel frame fabrication factory.

4 and 5 show a second embodiment of the invention.

In this case, in the previous example, a large number of through holes 12... are arranged horizontally at two locations, and the U-shaped core hoop lines 4... are placed at the same horizontal position from both sides.
are inserted and joined together to form individually closed hoops. Other details are the same as in the previous example, so explanations will be omitted.

"Effects of the Invention" According to the present invention, a large number of through holes having a larger diameter than the core hoop reinforcement to be inserted are formed in the web of a steel column in several rows in the longitudinal direction at the middle part of the web width direction. , and are arranged at a predetermined pitch, core hoop reinforcements are loosely inserted into these through holes, and the intermediate column main reinforcement corresponding to the web is restrained by these core hoop reinforcements, so that the intermediate column main reinforcement corresponding to the web is restrained. The main pillar reinforcement of the column can sufficiently restrain the core concrete in the central part divided by the web, that is, the core concrete located on both sides of the web, and the many through holes with a larger diameter than the core hoop reinforcement It is possible to give integrity to the concrete that was previously divided by It is possible to significantly improve the concrete retention performance under the column, and in turn, it is possible to dramatically improve the deformation ability against bending shear force under high axial force, and to prevent column buckling as much as possible.

It is particularly effective and suitable for high-rise and super-high-rise steel reinforced concrete columns.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
The figure is a cutaway plan view of the first example, Figure 2 is a front view of the main parts of the same example, Figure 3 is a perspective view of the main parts of the same example, and Figure 4 is the main part of the second example. FIG. 5 is a perspective view of essential parts of the same example, and FIG. 6 is a cutaway plan view showing a conventional example. 1... Steel column, 2... Reinforcement, 3... Concrete, 4... Core hoop reinforcement, 11... Web, 12
...Through hole, 21...Column main reinforcement, 22...Hoop reinforcement.

Claims (1)

[Claims] 1. In a steel reinforced concrete column in which reinforcement consisting of multiple corner and intermediate column main reinforcements and a large number of hoop reinforcements is placed around a steel column with an H-shaped cross section, and the poured concrete is restrained by the reinforcement arrangement, the steel column is A large number of through holes with a diameter larger than the core hoop muscle to be inserted are arranged in several rows in the length direction of the web at a predetermined pitch in the middle part of the web width direction, and these through holes are arranged at a predetermined pitch. A steel reinforced concrete column characterized in that core hoop reinforcements are loosely inserted into each core hoop reinforcement, and intermediate column main reinforcements corresponding to the webs are further restrained by these core hoop reinforcements.