CN201343782Y - Combined coupling beam for inclined steel bracing strut concrete shear wall - Google Patents

Abstract

The utility model relates to a composite connecting beam for a concrete shear wall supported by inclined steel, which belongs to a connecting beam for a shear wall. The utility model comprises a horizontal steel bar, a connecting beam stirrup bound on the outside of the horizontal steel bar, two inclined steel bar supports arranged in an X shape and an inclined steel support arranged inside the inclined steel bar supports. The two ends of the inclined steel bars extend into the concrete shear wall on both sides of the coupling beam. Frame beams are arranged at the upper and lower parts of the connecting beams, and the frame beams, inclined steel supports and inclined steel supports are combined to form a combined connecting beam of inclined steel supporting concrete shear walls. The axial force in the wall body of the utility model is reduced, and the ductility of the connecting beam is increased. Diagonal intersecting oblique steel supports and oblique steel supports are more evenly distributed on the height of the coupling beam along the direction of the main tensile stress, which can better resist the oblique main tensile stress of the coupling beam. The shear stiffness reduces the shear deformation; in the direction of the main compressive stress, the inclined steel support and the inclined steel support will also assist the concrete to bear the main compressive stress.

Description

Composite Coupling Beams Supported by Inclined Steel Concrete Shear Walls

technical field

The invention relates to a composite connecting beam of a concrete shear wall supported by inclined steel, which belongs to a shear wall connecting beam.

Background technique

Beams connected to shear walls are called coupling beams. Coupling beams generally have a relatively small span height, and the shear walls connected to them have high stiffness. Therefore, under the action of horizontal forces in high-rise buildings, the internal force of the coupling beams is often large, and the section design often exceeds the limit. In the design, it is always necessary to take appropriate measures to adjust the internal force of the coupling beam, so that the structure can not only bear the vertical load capacity, but also meet the strength and stiffness requirements under the horizontal force.

Under the action of wind load and earthquake load, the shear wall pier produces bending deformation, which makes the coupling beam produce a corner, so that the coupling beam generates internal force. At the same time, the bending moment, shear force and axial force at the end of the connecting beam in turn constrain the internal force and deformation of the wall pier, improving the stress state of the wall pier. The failure of coupling beams in the shear walls of high-rise buildings under horizontal load can be divided into two types, namely brittle failure (shear failure) and ductile failure (bending failure). Coupling beams lose their bearing capacity when brittle failure occurs. When shear failure occurs to all coupling beams along the full height of the wall, each wall pier loses the restraining effect of the coupling beams on it and becomes a single-piece independent beam. This will greatly reduce the lateral stiffness of the structure, increase the deformation, increase the bending moment of the wall pier, and further increase the P-Δ effect (the additional bending moment caused by the vertical load due to the horizontal displacement), and may eventually lead to the structural failure. collapse. When the ductile failure of the coupling beam occurs, vertical cracks will appear at the end of the beam, micro-cracks will appear in the tension area, and cross cracks will appear under the action of the earthquake, and plastic hinges will be formed, the structural stiffness will decrease, and the deformation will increase, thereby absorbing a large amount of earthquakes. At the same time, the bending moment and shear force can still be transmitted through the plastic hinge, which plays a certain restraint role on the wall pier, so that the shear wall maintains sufficient rigidity and strength. In this process, the coupling beam plays a role of energy consumption, which plays an important role in reducing the internal force of the wall and delaying the yield of the wall. However, under the repeated action of earthquakes, the cracks of the coupling beam will continue to develop until the concrete is damaged under compression.

In the cooperative work of wall piers and coupling beams, the shear wall should have sufficient rigidity and strength. Under normal service loads and wind loads, the structure should be in an elastic working state, and the connecting beams will not produce plastic hinges. Under earthquake action, the structure is allowed to enter an elastic-plastic state, and the coupling beams are allowed to produce plastic hinges. According to the requirements of the general principles of seismic design codes, when buildings are affected by frequent earthquakes lower than the local fortification intensity, they can generally be used without damage or without repairs; when subjected to rare earthquakes higher than the local fortification intensity, not to collapse or cause life-threatening serious damage. Therefore, the design of the shear wall should ensure that no shear failure occurs, that is, the design of the wall piers and coupling beams must comply with the principle of strong shear-weak bending, and the yield of the coupling beams should be earlier than that of the wall piers, and the wall Legs and coupling beams have good ductility.

The design of shear wall coupling beams in high-rise buildings is restricted by many factors. Coupling beams generally have the characteristics of small span, large cross-section, and high stiffness of the wall connected to the coupling beam. Generally, under the action of wind load and earthquake load, the internal force of the coupling beam is often very large, so that the coupling beam is over-reinforced or overrun. In the slender connecting beam with relatively large span height, the dominant shear force transfer mechanism is a truss mechanism composed of concrete oblique compression rods, vertical stirrup rods, and upper and lower chords parallel to each other. With the decrease of the span-to-height ratio, controlled by the coordination conditions of bending and shear deformation of the entire beam section, a considerable part of the shear force will be transmitted through the diagonal oblique bars. In this case, the slope of the oblique cracks generally increases. From the general trend, the principal tensile stress in the coupling beam also becomes mainly acting along the diagonal direction. At this time, the effect of the stirrup, that is, the effect of the truss mechanism, will gradually weaken with the decrease of the span-to-height ratio. In addition, in high-rise buildings, due to the uneven compression of the wall piers at both ends of the coupling beam, the vertical displacement difference between the two ends of the coupling beam will also generate internal forces in the coupling beam. Therefore, the design of a new type of coupling beam structure is a necessary link to ensure that high-rise buildings have good seismic performance.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects of the existing coupling beam structure, and to provide a composite coupling beam supported by inclined steel concrete shear walls, which significantly improves the bearing capacity, ductility and seismic energy consumption of the coupling beam of high-rise buildings Ability.

In order to achieve the above object, the present invention adopts the following technical solutions. The invention comprises a horizontal steel bar, a connecting beam stirrup bound on the outside of the horizontal steel bar, two inclined steel bar supports arranged in an X shape and an inclined steel support arranged inside the inclined steel bar support. In the concrete shear wall on the side, and make it anchored reliably in the shear wall.

Frame beams are also arranged at the upper and lower parts of the connecting beams, and the frame beams include horizontal reinforcing bars of the connecting beams arranged in the connecting beams and stirrups bound outside the horizontal reinforcing bars of the connecting beams. The two ends of the horizontal steel bars of the frame beam are respectively inserted into the shear wall body, and are reliably anchored in the shear wall body.

The section of the inclined steel support is "I" shape.

A method for manufacturing a composite connecting beam of a concrete shear wall supported by inclined steel, the method comprising the following steps:

1) Configure the longitudinal reinforcement and horizontal reinforcement in the shear wall;

2) Configure the longitudinal reinforcement of the concealed column at the end of the shear wall close to the connecting beam;

3) The oblique steel support is prepared in the connecting beam. The oblique steel support is arranged in the middle of the two shear walls in an X shape, and its two ends are reliably anchored in the shear wall.

4) Diagonal steel support is arranged on the outside of the oblique steel support, and the support stirrups are evenly tied on the outside of the oblique steel support, and the two ends of the oblique steel support are reliably anchored in the shear wall;

5) Bundle the connecting beam stirrup outside the horizontal reinforcement in the connecting beam;

6) Bind the longitudinal reinforcement of the concealed column at the end of the shear wall, and evenly bind the quadrilateral stirrup on the outside of the longitudinal reinforcement of the concealed column;

7) The horizontal steel bars of the connecting beam are arranged on the upper and lower parts of the connecting beam, and the stirrups are tied on the outside of the horizontal steel bars of the connecting beam to form a frame beam;

8) Leave a certain thickness of protective layer on the outside of the coupling beam for supporting formwork;

9) The frame beam, the shear wall body, the inclined steel support and the inclined steel support are poured and rammed at one time to form the inclined steel supported concrete shear wall composite coupling beam.

Compared with the traditional coupling beam, the invention adds a diagonal steel support inside the support of the diagonal steel bar, so that the axial force in the wall body is reduced and the ductility of the coupling beam is increased. Diagonal intersecting oblique steel supports and oblique steel supports are evenly distributed on the height of the coupling beam along the main tensile stress direction, which can better resist the oblique main tensile stress of the coupling beam and limit the development of oblique cracks. It can significantly improve the shear stiffness of the component and reduce the shear deformation; in the direction of the principal compressive stress, the inclined steel support and the inclined steel support will also assist the concrete to bear the principal compressive stress. Using inclined steel to support concrete shear wall combined beams can improve the overall seismic performance of the shear wall structure system, and when the building encounters a strong earthquake, it can reduce its earthquake damage and prevent its collapse.

Description of drawings

Fig. 1 is the reinforcement schematic diagram of a structural unit of inclined steel support concrete shear wall composite connecting beam of the present invention;

Fig. 2 is the enlarged schematic view of A-A section in Fig. 1;

Fig. 3 is the enlarged schematic view of B-B section in Fig. 1;

In the figure: 1. Shear wall body, 2. Slanted steel support, 3. Horizontal reinforcement of frame beam, 4. Rectangular stirrup of frame beam, 5. Slanted steel support, 6. Rectangular stirrup supported by slanted steel, 7. Concealed column longitudinal reinforcement, 8, wall longitudinal reinforcement, 9, wall horizontal reinforcement, 10, concealed column rectangular stirrup, 11, frame beam, 12, coupling beam stirrup.

Detailed ways

Below in conjunction with accompanying drawing 1～accompanying drawing 3 the embodiment of the present invention is described in further detail:

The schematic diagram of the structural reinforcement of a structural unit of the composite coupling beam of the concrete shear wall supported by inclined steel is shown in Fig. 1, Fig. 2 and Fig. 3. The inclined steel support 2 inside the reinforcement support 5 is composed of concrete composite connecting beams. The reinforcement of the shear wall body 1 is the longitudinal steel bar 8 and the horizontal steel bar 9, and the end of the wall close to the connecting beam is provided with a concealed column, and the concealed column is equipped with a concealed column longitudinal steel bar 7 and bound on the outside of the concealed column longitudinal steel bar 7 10 of hidden column rectangular stirrups.

As shown in Figure 1, frame beams 11 are arranged on the upper and lower parts of the connecting beams. The reinforcement of the frame beams 11 with rectangular cross-sections is the frame beam horizontal reinforcement 3, and the two ends of the frame beam horizontal reinforcement 3 are respectively inserted into the shear wall pier 1, and make them respectively meet the requirements of the anchorage length, rectangular stirrups 4 are evenly bound on the outside of the frame beam horizontal reinforcement 3 along the direction of the longitudinal reinforcement of the connecting beam, and the stirrups 4 of the frame beam are evenly distributed to the beam end.

Two inclined steel supports 5 are arranged in an X shape inside the connecting beam, and each inclined steel support 5 is composed of four steel bars, and an inclined steel support 2 is arranged inside the four steel bars, and the outside of the inclined steel supports 5 is uniformly fixed The upper and lower ends of the rectangular stirrup 6, the inclined steel support 5 and the inclined steel support 2 all extend into the concrete shear walls 1 on both sides, and are reliably anchored with the concrete shear walls. The inclined steel support 2 is a steel plate, and its cross-sectional shape is "I" shape. The relative position between the inclined steel support 2 and the inclined steel bar support 5 can be realized by welding and binding. The frame beam 11, the inclined steel support 2 and the inclined steel bar support 5 are combined to form a composite connecting beam of the inclined steel support concrete shear wall.

As shown in FIG. 3 , stirrups 12 are fixed along the outer sides of the horizontal steel bars in the coupling beam. Finally, the frame beam 11, the shear wall body 1, the inclined steel support 2 and the inclined steel support 5 are poured and stamped at one time to form the inclined steel supported concrete shear wall composite coupling beam.

In this embodiment, the manufacturing method of the composite connecting beam of inclined steel braced concrete shear wall is as follows:

1) Binding the longitudinal reinforcement 8 and the horizontal reinforcement 9 in the shear wall body 1;

2) Arranging concealed column longitudinal reinforcement 7 at the end of the shear wall body 1;

3) Two oblique steel supports 2 are prepared, and the two oblique steel supports 2 are arranged in the middle of the two shear wall bodies 1 in an X shape, and their two ends are reliably anchored in the shear wall bodies 1 . When the section of the oblique steel support 2 is larger than the distance between the longitudinal steel bars 7 of the concealed columns on both sides of the shear wall, holes are opened at the place where the longitudinal reinforcement 7 of the concealed column of the shear wall passes through the flange of the oblique steel support 2, and the oblique The steel support 2 is reliably anchored in the shear wall body 1;

4) Arrange diagonal steel support 5 on the outside of diagonal steel support 2, tie support stirrups 6 evenly on the outside of diagonal steel support 5, and diagonal steel support 5 is reliably anchored in shear wall body 1. Reliable anchoring of the inclined steel support 2 and the inclined steel bar support 5 in the shear wall body 1 means that the degree of anchorage must meet the relevant requirements in the current "Code for Seismic Design of Buildings" and "Technical Regulations for Concrete Structures of High-Rise Buildings".

5) binding the connecting beam stirrup 12 on the outside of the horizontal steel bar 9 in the connecting beam 11;

6) binding the concealed column longitudinal reinforcement 7 at the end of the shear wall body 1, and binding the quadrilateral stirrup 10 evenly outside the concealed column longitudinal reinforcement 7;

7) Bind the frame beam horizontal steel bar 3 in the frame beam 11, insert the two ends of the frame beam horizontal steel bar 3 into the shear wall body 1 respectively, and make the two ends be reliably anchored in the shear wall body 1. Bind rectangular stirrups 4 evenly along the direction of the longitudinal reinforcement of the connecting beam on the outer side of the horizontal reinforcement 3;

8) A certain protective layer thickness is left on the outer side of the coupling beam 11 for supporting formwork;

9) The frame beam 11, the shear wall body 1, the inclined steel support 2 and the inclined steel support 5 are poured and rammed at one time to form a composite connecting beam of the inclined steel supported concrete shear wall.

Claims (3)

1, oblique steel support concrete shear wall composite coupling beams, comprise horizontal reinforcement, colligation at the coupling beam stirrup in the horizontal reinforcement outside be two diagonal reinforcements that X-shaped arranges and support (5), diagonal reinforcement supports the two ends of (5) and stretches in the concrete shear force wall body of wall (1) of coupling beam both sides; It is characterized in that: comprise that also being arranged in diagonal reinforcement supports (5) inner oblique steel support (2).

2, oblique steel support concrete shear wall composite coupling beams according to claim 1, it is characterized in that: also be provided with frame beam (11) in the upper and lower of coupling beam, described frame beam (11) comprises coupling beam horizontal reinforcement (3) and the frame beam stirrup (4) of colligation outside coupling beam horizontal reinforcement (3) that is arranged in the coupling beam, insert respectively in the shear wall body of wall (1) at the two ends of frame beam horizontal reinforcement (3), and make its reliable anchoring in shear wall body of wall (1).

3, oblique steel support concrete shear wall composite coupling beams according to claim 1 is characterized in that: the cross section that described oblique steel supports (2) is " worker " font.

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