CN103243819A - Fabricated concrete column-steel beam energy dissipation type panel point connecting device - Google Patents

Abstract

The invention discloses an assembled concrete column-steel beam energy-dissipating node connection device, which is composed of a beam-beam bolt connection part and a frictional energy-dissipating device, including a prefabricated concrete column, a pre-embedded steel beam, an intermediate steel beam and a combined connecting steel The cross-sections of the pre-embedded steel beam and the intermediate steel beam are both H-shaped, the webs of the pre-embedded steel beam and the intermediate steel beam are connected by the web cover plate, and the flanges of the embedded steel beam and the intermediate steel beam are connected by the connecting cover board connection. The friction plate attached to the combined steel parts is used to dissipate the seismic energy through the frictional energy dissipation mechanism. Compared with the prior art, the connection device in the present invention can reduce the adverse effects on the floor; the beam-hinge yield mechanism of the strong column and the weak beam can be realized by moving the plastic hinge outward; the energy dissipation device can improve the energy consumption of the assembled structure and reduce the main Damage to structural components; connection parts and steel beams can be easily repaired, replaced, disassembled and reused; at the same time, the invention adopts fully prefabricated industrial standard production, and all bolts are installed on site, which has strong engineering practicability.

Description

Prefabricated Concrete Column-Steel Beam Energy Dissipating Node Connection Device

technical field

The invention relates to a fully prefabricated assembled mixed frame structure, in particular to an assembled concrete column-steel beam energy-consuming node connection device.

Background technique

For prefabricated concrete frame structures, nodes and connections often become the weakest link in the entire structural system. Since the node connection plays an important role in transmitting, distributing internal forces and ensuring the integrity of the structure in the frame, its damage may cause the entire frame to lose its bearing capacity and cause the structure to collapse. Most areas in my country are located in earthquake-prone areas, and the connection reliability of prefabricated structures is poor, which makes it difficult to meet the performance requirements under earthquakes. In addition, the post-earthquake repair of node areas is difficult, so nodes and connections have become restrictions on the use of prefabricated structures in earthquake areas. the bottleneck. In the development of a new generation of prefabricated structural systems, the research and development of new beam-column joints and connection methods is of great significance.

In traditional cast-in-place and prefabricated frames, the structure mainly dissipates energy through its own plastic deformation. Earthquake damage and damage bring difficulties to repair and subsequent use, and it is increasingly unable to meet people's new requirements for structural seismic performance. In recent years, the shock absorption technology represented by the passive energy dissipation damper has been greatly developed. For the prefabricated structural system, the existing research and development is concentrated on the nodes, and the research and development of the connection device related to the full prefabricated assembly process is insufficient. The damage controllable connection is developed, and based on this, an inelastic response structural system with a high damage threshold is formed. It has become an important way to improve the seismic performance of joints and structural systems. For this reason, it is urgent to develop a new type of energy-consuming assembly node, which has the following characteristics:

1. Use semi-rigid joints, which are rigid under normal conditions of use, and can rotate according to reliable hysteresis characteristics under rare earthquakes. Once the rare earthquake stops, the joints will behave rigidly again.

2. When subjected to earthquake impact, there will be no unfavorable cracking effect on the floor due to the growth of the beam end when the structure is deformed. In many concrete and precast concrete frames, beam end growth will have an adverse effect, possibly cracking the slab, and may even reduce the collapse resistance of the structure by increasing the seismic demands on the columns.

3. The space requirement for placing the damping device is a key concern in the application of the damper, and it is necessary to minimize the impact of the damping device on the function of the building.

4. The damage is small under the action of large earthquakes, and it can provide repairable functions after moderate and large earthquakes.

5. It can realize the outward movement of the plastic hinge. The latest research results of steel structure joints show that the ductility of joints can be improved by using the method of moving plastic hinges outward, so as to avoid brittle failure of beam-column joints under strong earthquakes.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention proposes a prefabricated concrete column-steel beam energy-dissipating node connection device, which is rigid in normal use, and the energy-dissipating device installed at the connection part makes the structure It has good energy dissipation capacity and can provide repairable functions after moderate and large earthquakes, so as to ensure the overall stability of the structure and reduce the cost of post-disaster repairs. It can be widely used in prefabricated frame structures in earthquake areas.

Technical solution: In order to solve the above technical problems, a prefabricated concrete column-steel beam energy-dissipating node connection device of the present invention includes a prefabricated concrete column, a prefabricated concrete column embedded in the precast concrete column and a prefabricated concrete column protruding from the surface of the precast concrete column. The embedded steel beam and the intermediate steel beam connecting the pre-embedded steel beam, the cross-sections of the pre-embedded steel beam and the intermediate steel beam are both H-shaped, and the webs of the pre-embedded steel beam and the intermediate steel beam are connected by a web cover plate, The flanges of the pre-embedded steel beams and the intermediate steel beams are connected by connecting cover plates.

The connection cover plate includes an oblong hole connection cover plate and a round hole connection cover plate, the oblong hole connection cover plate is provided with an oblong hole, and the round hole connection cover plate is provided with a circular hole; the oblong hole connection cover plate There is a friction plate between the embedded steel beam and the intermediate steel beam; an additional web cover is placed on the outside of the web cover, and a web friction is provided between the additional web cover and the web cover.

The web cover plate is provided with a circular hole and an oblong hole, the web cover plate is connected with the pre-embedded steel beam through the cooperation of the bolt and the circular hole, and the web cover plate is connected with the upper circular hole, The oblong hole in the lower part is connected with the middle steel beam; the connection cover plate is provided with an oblong hole or a circular hole, and the connection cover plate is respectively connected with the preset through the cooperation of the bolt and the oblong hole or circular hole. Buried steel beams and intermediate steel beams are connected.

In the present invention, the concrete column is prefabricated in a factory, wherein a section of pre-embedded steel beam protruding from the column surface is pre-embedded. The beam-to-column connection is through-beam. The concrete column and pre-embedded steel beam are prefabricated in the factory. The beams are connected, and the prefabricated concrete columns are connected with the sleeve grout anchor technology to form an overall frame structure.

The above pre-embedded steel beams and intermediate steel beams are placed between the web and flange surfaces with friction plates made of materials such as brass or aluminum, and through the prestress on the friction-type high-strength bolts, a normal pressure perpendicular to the friction surface is provided. In normal use, the connection behaves rigidly, and forms a slip hinge under the action of a strong earthquake, which dissipates seismic energy through friction.

The above-mentioned prefabricated concrete column connection part generates relative rotation with the upper flange as the rotation center through the slippage of the lower flange and the bolt at the bottom of the web, thereby reducing the adverse effect on the floor slab from cracking.

The above-mentioned pre-embedded steel beams are connected by friction-type high-strength bolts and connecting cover plates far away from the column surface. By reasonably arranging the bolts on the connecting cover plates, the plastic hinge (slip hinge) is controlled at the connecting position, so that not only the plasticity The hinge is far away from the cylinder, which effectively reduces the shear force on the core area of the joint, creates conditions for the core area to reduce or cancel stirrups, and can improve the rotation capacity and shear performance of the plastic hinge area, and improve the ductility of the plastic hinge area and energy dissipation capacity, and finally realize the yield energy dissipation mechanism of strong columns and weak beams of the overall frame.

In view of the wide application of concrete frames in our country, and the earthquake damage of frame joints is very common and the difficulty of reinforcement and repair is relatively large. At the same time, building standardization and industrialization are the development trend of current industrialization, so the present invention has positive social and scientific significance .

Beneficial effects: Compared with the prior art, the present invention overcomes the shortcomings of traditional prefabricated concrete and steel beam through-type concrete column joints, and focuses on solving the problems of complex connection structure and energy consumption of steel beam through-type joints. The rotation and slip generated at the connection part provides ductile energy dissipation, which can meet the anti-seismic principle of strong joints and strong anchorage joints, improve the damage threshold of the structure, and make the main structural components have no damage or little damage. The present invention can obtain following excellent performance:

(1) Passive energy-dissipating devices formed by friction plates made of brass, aluminum and other materials can still provide stable inelastic resistance after many cycles of large deformation; in the late elastic stage, the structure still ensures a large enough The anti-lateral stiffness minimizes the P-△ effect; when the external action becomes smaller, the structure can recover sufficient stiffness.

(2) By setting multi-layer shear friction surfaces to shorten the connection length, reduce the number of bolts, and avoid bolt breakage. When the flange plate is broken, the web bolts on the horizontal line adjacent to the flange can provide a horizontal force transmission path for the axial action caused by the bending moment of the beam, and can still maintain a reasonable bending resistance under high rotation requirements;

(3) By setting up the connection device of multi-layer sliding of the lower flange, it not only reduces the impact of the energy-consuming device on the building function, but also avoids the common tensile crack damage to the concrete floor due to the movement of the center of rotation to the upper flange;

(4) The plastic hinge moves outward from the column surface, thereby reducing the damage to the core area of the joint, and easily realizing the beam-hinge yield mechanism of strong columns and weak beams;

(5) After the steel beams and concrete columns are prefabricated in the factory, they are connected by full bolts without welding on site, and the construction work on site is less, which is conducive to reducing labor costs, speeding up the construction progress and ensuring quality, making the cost of manufacturing and installing low-damage connections comparable to traditional connection close;

(6) Under the action of medium and large earthquakes, the shock damage is concentrated in the energy-dissipating parts and the connecting parts, and the main beam-column components can be almost free of damage under the designed displacement level, which can avoid the failure of the overall nodes, and the connecting parts and steel beams can be conveniently Repair replacement and disassembly for reuse.

Description of drawings

Fig. 1 is the schematic diagram of the connection elevation of the frame beam-column node after adopting the device of the present invention;

Fig. 2 is the rotational deformation schematic diagram of embodiment 1 in the present invention;

Fig. 3 is the elevation schematic diagram of embodiment 2 among the present invention;

Fig. 4 is the elevation schematic diagram of embodiment 3 in the present invention;

Fig. 5 is the frame structure elevation schematic diagram after adopting the device of the present invention;

In the figure: 1 prefabricated concrete column; 2 Belleville gasket; 3 intermediate steel beam; 4 embedded steel beam; 5 high-strength bolt; 6 round hole connection cover plate; 10 web additional cover plate; 11 oblong hole; 12 circular hole; 13 high-strength friction bolt; 14 web friction plate.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 5, the prefabricated concrete column-steel beam energy-dissipating node connection device of the present invention includes a precast concrete column 1, a prefabricated concrete column embedded in the precast concrete column 1 and protruding from the precast concrete column 1. The embedded steel beam 4 and the intermediate steel beam 3 connecting the embedded steel beam 4, the cross sections of the embedded steel beam 4 and the intermediate steel beam 3 are both H-shaped, and the webs of the embedded steel beam 4 and the intermediate steel beam 3 The web cover plate 8 is connected, and the flanges of the embedded steel beam 4 and the intermediate steel beam 3 are connected through the connecting cover plate.

Wherein, the connection cover plate comprises an oblong hole connection cover plate 7 and a round hole connection cover plate 6, the oblong hole connection cover plate 7 is provided with an oblong hole 11, and the round hole connection cover plate 6 is provided with a circular hole 12; A friction plate 9 is provided between the hole connection cover plate 7 and the embedded steel beam 4 and the middle steel beam 3; the web additional cover plate 10 is placed on the outside of the web cover plate 8, and the web cover plate 8 and the additional web cover plate A web friction plate 14 is provided between the plates 10; a circular hole 12 and an oblong hole 11 are provided on the web cover plate 8, and the web cover plate 8 cooperates with the embedded steel beam through the cooperation of the bolt and the circular hole 12 4 connection, the web cover plate 8 is connected with the middle steel beam 3 through the cooperation of bolts and the upper circular hole 12 and the lower oblong hole 11; the connecting cover plate is provided with an oblong hole 11 or a circular hole 12 , the connecting cover plate is respectively connected with the embedded steel beam 4 and the intermediate steel beam 3 through the cooperation of the bolts and the oblong hole 11 or the circular hole 12 . The connection cover plate includes a round hole connection cover plate 6 and an oblong hole connection cover plate 7 ; the bolts include high-strength bolts 5 and high-strength friction bolts 13 .

Specifically, the prefabricated concrete column-steel beam energy-dissipating node connection device of the present invention is mainly composed of beam-beam bolt connection parts and a frictional energy-dissipating device. As shown in Figure 1, it includes prefabricated concrete columns 1, intermediate steel beams 3, outstretched embedded steel beams 4, high-strength bolts 5, round hole connection cover plates 6, oblong hole connection cover plates 7, web cover plates 8, Friction plate 9, web additional cover plate 10, high-strength friction bolt 13, web friction plate 14, wherein high-strength bolt 5 and high-strength friction bolt 13 are provided with Belleville washers 2.

The pre-embedded steel beam 4 is pre-embedded in the precast concrete column 1 and protrudes from the column surface of the precast concrete column 1, leaving a gap between the pre-embedded steel beam 4 and the middle steel beam 3, and the middle steel beam 3 and the pre-embedded steel beam Place the round hole connection cover plate 6 on the upper side of the 4 end; place the web cover plate 8 on both sides or one side of the web of the middle steel beam 3 and the embedded steel beam 4, and place the web additional cover on the outside of the web cover plate 8 The plate 10 and the oblong hole connection cover plate 7 are respectively placed on the upper and lower edges of the middle steel beam 3 and the lower flange of the embedded steel beam 4 . The upper flange and web of the intermediate steel beam 3 and the embedded steel beam 4 are connected by high-strength bolts 5, and high-strength friction is installed on the lower flange of the intermediate steel beam 3 and the embedded steel beam 4 and the additional web plate 10 type bolt 13 for connection. Both the upper flange and the web connected by high-strength bolts 5 have circular holes 12, and the additional cover plate 10 of the web connected by high-strength friction bolts 13 and the lower flange of the intermediate steel beam 3 and the embedded steel beam 4 Offer oblong hole 11.

The prefabricated concrete column-steel beam energy-consuming node connection device of the present invention is prepared through the following steps: first, the prefabricated concrete column 1 and the intermediate steel beam 3 are made in the prefabrication factory, and the prefabricated concrete column 1 is prefabricated in the factory. The concrete of the beam 4 and the column is poured at one time, the longitudinal reinforcement of each precast concrete column 1 protrudes from the top of the column, and a grout anchor sleeve is reserved at the bottom of the column. After the prefabricated column is transported to the construction site, the connection between the upper and lower columns is completed by using the grout anchor method, that is, the precast concrete column 1 is hoisted so that the longitudinal reinforcement protruding from the lower column is aligned and inserted into the grout anchor sleeve, and the grout is adjusted after the verticality of the column is corrected. Anchor sleeves are grouted.

The joints of beams and columns are composed of combined steel parts to form a friction energy dissipation device. The energy dissipation components include the middle steel beam 3, the lower flange plate of the embedded steel beam 4, the oblong hole connection cover plate 7, the web additional cover plate 10 and friction Sheet 9, web friction sheet 14, friction type high-strength bolt 13 and supporting spring washer. Among them, there are four oblong hole connection cover plates 7, which are respectively arranged on the upper and lower edges of the middle steel beam 3 and the lower flange of the embedded steel beam 4; there are two additional web plate cover plates 10, which are symmetrically arranged on both sides of the steel beam web. side; four friction plates 9 are set between the middle steel beam 3, the lower flange of the embedded steel beam 4 and the oblong hole connection cover plate 7, and are attached to the inner side of the oblong hole connection cover plate 7; two web friction plates 14 has the same plane size as the additional web cover 10, is arranged between the web cover 8 and the additional web cover 10, and is attached to the inner side of the additional web cover 10; friction-type high-strength bolts 13 will include Each component including the intermediate steel beam 3 and the embedded steel beam 4 is fixed together. Through the prestress on the friction-type high-strength bolts 13, a normal pressure perpendicular to the friction surface is provided. When the beam-column connection produces relative displacement under the action of a strong earthquake, the friction plate 9, the web plate friction plate 14 and the lower flange of the steel beam The contact surface with the web cover plate 8 will dissipate the seismic energy through friction.

After the prefabricated beams and columns are assembled and connected by high-strength bolts 5 and high-strength friction bolts 13, an integral hybrid frame structure is formed.

According to the different arrangement modes of the friction energy dissipation device, the fabricated concrete column-steel beam energy dissipation node connection device of the present invention can be divided into three different implementation situations.

Example 1:

This embodiment is an asymmetrical frictional connection. In the connection form shown in Figure 1, the friction plate 9 is only arranged at the lower flange, the web friction plate 14 is arranged at the web near the lower flange, and the friction plate 9 and the web friction plate 14 are respectively located in the oblong hole connecting cover The plate 7 and the web are attached to the inner side of the cover plate 10 . The joint behaves rigidly in normal use, and the beam-to-column connection under strong earthquakes generates relative rotation with the upper flange as the center of rotation through the slippage of the high-strength friction bolts 13 at the lower flange and the bottom of the web, as shown in Figure 2 Shown, so as to reduce the impact on the floor. When the contact surface between the friction plate 9 and the lower flange of the steel beam and the web cover plate 8 slips, the seismic energy is dissipated through friction to form a slip hinge. By setting the gap at the beam end, the oblong hole 11 is opened to meet the requirements of the node for the rotation capacity.

Example 2:

This embodiment is a symmetrical frictional connection. As shown in Figure 3, the oblong hole connection cover plate 7 is symmetrically arranged on the upper and lower flanges, and the friction plate 9 is respectively arranged between the oblong hole connection cover plate 7 and the upper and lower flanges, and the friction plate 9 is located on the inner side of the oblong hole connection cover plate 7, The bolt holes connecting the cover plate are oblong holes 11, the bolt holes connecting the web cover plate 8 and the embedded steel beam 4 are circular holes 12, and the bolt holes connecting the web cover plate and the intermediate steel beam 3 are open It is oblong hole 11.

Example 3:

This embodiment is a connection mode without friction plates. As shown in Figure 4, round hole connection cover plates 6 are arranged symmetrically on the upper and lower flanges, but there is no friction plate between the round hole connection cover plate 6 and the flange, and there is no web additional cover plate 10 and web plate at the web. Plate friction plate 14. Circular holes 12 are provided on the flange and the web, and are connected by high-strength bolts 5 to form a nearly rigid connection.

To sum up, the fabricated concrete column-steel beam energy-dissipating node connection device of the present invention is mainly composed of beam-beam bolt connection parts and a frictional energy-dissipating device. The invention aims to develop a connecting device matched with the full prefabricated assembly process, reduce the adverse effect on the floor, and improve the energy consumption capacity of the assembled structure. The prefabricated concrete column 1 is prefabricated by the factory, and the joint adopts the beam through type. The embedded steel beam 4 protruding from the column surface and the intermediate steel beam 3 are connected at the flange and web by connecting cover plates and high-strength bolts. The friction plate 9 and the web friction plate 14 are respectively provided at the edge and the additional cover plate 10 of the web near the lower flange. The beam-column connection generates relative rotation with the upper flange as the center of rotation through the slippage of the lower flange and the bolts at the bottom of the web, thereby reducing the impact on the force and use of the floor. When the friction plate 9 and the lower flange of the steel beam and the contact surfaces of the web friction plate 14 and the web cover plate 8 slip, a sliding hinge is formed, and the seismic energy is dissipated through the frictional energy dissipation mechanism. Compared with the prior art, in the present invention, the nodes exhibit rigid behavior during normal use; the friction energy dissipation device provides good energy dissipation capacity; the plastic hinge moves outward to easily realize the beam-hinge yield mechanism of strong columns and weak beams; Focusing on energy-dissipating components and connecting parts can reduce the damage of main components such as beams and columns. The connecting parts and steel beams can be easily repaired, replaced, disassembled and reused. The fabricated concrete column-steel beam energy-dissipating node connection device of the present invention adopts fully prefabricated industrial standard production, is installed with all bolts on site, has strong construction operability, simple node structure, and strong engineering practicability.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (5)

1. A prefabricated concrete column-steel beam energy-dissipating node connection device, characterized in that it includes a precast concrete column (1), pre-embedded precast concrete column (1) and protruding precast concrete column (1) column The pre-embedded steel beam (4) on the surface and the intermediate steel beam (3) connecting the pre-embedded steel beam (4), the cross-sections of the pre-embedded steel beam (4) and the intermediate steel beam (3) are both H-shaped, The webs of the pre-embedded steel beam (4) and the intermediate steel beam (3) are connected through the web cover plate (8), and the flanges of the pre-embedded steel beam (4) and the intermediate steel beam (3) are connected through the connecting cover plate. 2. The prefabricated concrete column-steel beam energy-dissipating node connection device according to claim 1, characterized in that: the connection cover plate includes a long round hole connection cover plate (7) and a round hole connection cover plate (6) , the oblong hole connection cover plate (7) is provided with an oblong hole (11), and the round hole connection cover plate (6) is provided with a circular hole (12); the oblong hole connection cover plate (7) is connected to the preset A friction plate (9) is provided between the buried steel beam (4) and the intermediate steel beam (3). 3. The prefabricated concrete column-steel beam energy-dissipating node connection device according to claim 1, characterized in that: an additional web cover (10) is placed on the outside of the web cover (8), and the web A web friction plate (14) is provided between the plate additional cover plate (10) and the web cover plate (8). 4. The assembled concrete column-steel beam energy-dissipating node connection device according to claim 1, characterized in that: the web cover (8) is provided with circular holes (12) and oblong holes (11); the web cover plate (8) is connected to the pre-embedded steel beam (4) through the cooperation of bolts and circular holes (12); the web cover plate (8) is connected to the upper circular hole (12) through bolts , The oblong hole (11) at the bottom is connected with the middle steel beam (3). 5. The prefabricated concrete column-steel beam energy-dissipating node connection device according to claim 2, characterized in that: the oblong hole connection cover plate (7) is respectively It is connected with the embedded steel beam (4) and the intermediate steel beam (3).

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