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[The role of Liang Liang]
In a high-rise building, due to the non-uniform compression of the wall limbs at both ends of the coupling beam, vertical displacements at both ends of the coupling beam will be caused, and the coupling beam will also generate internal forces in the coupling beam. In designing, even taking various measures to reduce the internal forces of the coupling beam, such as: increasing the width of the opening of the shear wall; opening the horizontal seam in the middle of the coupling beam; reducing the stiffness of the coupling beam when calculating the internal force and displacement; It is still difficult for the design of the coupling beam to meet the requirements by adjusting the coupling beams with excessive internal forces.
Under the action of wind load and seismic load, the wall limbs are bent and deformed, so that the coupling beams generate a turning angle, so that the coupling beams generate internal forces. At the same time, the bending moment, shear force, and axial force at the ends of the coupling beam in turn reduce the internal forces and deformation of the wall limbs, and play a certain role in restraining the wall limbs and improving the stress state of the wall limbs. There are two types of failures of coupling beams in high-rise buildings shear walls under horizontal loads, namely brittle failure (shear failure) and ductile failure (bending failure). Coupling beams lose their bearing capacity in the event of brittle failure. When all coupling beams at the full height along the wall undergo shear failure, each wall limb loses its restraining effect on the coupling beam and will become a single piece of independent wall. This will greatly reduce the lateral stiffness of the structure, increase the deformation, increase the bending moment of the pier, and further increase the P-Δ effect (additional bending moment due to the vertical load due to the horizontal displacement), and may eventually lead to structural collapse. In the event of ductile failure of coupling beam, vertical cracks will appear at the beam end, micro-cracks will appear in the tension zone, cross cracks will appear under the action of earthquakes, and plastic strands will form, the structural rigidity will decrease, and the deformation will increase to absorb a large number of earthquakes. Energy, while still passing through the plastic hinge, can continue to transmit bending moments and shear forces, and it can play a certain role in restraining the wall limbs, so that the shear wall can maintain sufficient rigidity and strength. In this process, the coupling beams play a role in energy consumption, which plays an important role in reducing the internal forces of the limbs and delaying the submission of the limbs. However, under the repeated action of the earthquake, the cracks in the coupling beams will continue to develop and widen until the concrete is destroyed by pressure.
[Be careful when designing] 
Therefore, in the actual project, to make the design of the coupling beam satisfy the principle of strong shearing and weak bending, we must consider the following aspects: The reduction of the stiffness of the coupling beam. Due to the small span-to-height ratio and the stiffness of the connected limbs, the internal forces under the horizontal force are often very large. When the beams are yielded, they show cracks at the ends of the beams, the stiffness is weakened, and the internal forces are redistributed. Therefore, at the beginning of the overall calculation of the structure, it is necessary to reduce the stiffness of the coupling beam. According to Article 417 of the "Regulations for the Design and Construction of Reinforced Concrete High-rise Building Structures": "In the calculation of internal forces and displacements, all components may adopt elastic stiffness. In the frame-shear wall structure, the stiffness of coupling beams may be Reduction, the reduction factor should not be less than 0.50. "Generally in actual design, we take values ​​between 0.50-1 to meet the requirements of the cross-section design. The clause 5.2.1 of “Technical Specification for High-Rise Building Concrete Structures†JGJ3-2010 states that the calculation of the effect of gravity load and wind load should not consider the reduction of the coupling beam stiffness, and the coupling beam stiffness can be considered for combined conditions with earthquake effect effects. Reduction. The description in Section 6.2.13 of "Code for Seismic Design of Buildings" GB50011-20102 states that the stiffness of coupling beams may not be reduced when the displacement is calculated.
The span beam reduces the height. In the coupling beam design, after the stiffness is reduced, the bending capacity of the normal section of the coupling beam or the shear bearing capacity of the oblique section may still be insufficient. At this time, the width of the opening may be increased to reduce the stiffness of the coupling beam. The overall stiffness of the structure is reduced, which also reduces the effect of earthquakes, so that the bearing capacity of coupling beams may not exceed the limit. If only part of the beam is over-reinforced or out-of-limit, the inner force of the coupling beam can be adjusted to solve the problem. The adjustment range should not be greater than 20%, and the coupling beam must meet the requirements of "strong shear weak curve". 
Xiaobian conclusion: Through the introduction of the above content, I believe that everyone has a more comprehensive understanding of the role of Liang Liang , if you need to know more relevant knowledge, please continue to pay attention to this site information platform.
Coupling beam refers to the connection of wall and wall limbs in shear wall structures and frame-shear wall structures. Coupling beams are beams that connect two ends with a shear wall in a plane. Coupling beams generally have characteristics such as small span and large cross-section, and large wall stiffness connected with coupling beams. What are the roles of beams ? Let's get to know it soon.