Mechanical Performance Analysis Of Hybrid Reinforced Shear Wall

As an important defense line against earthquake,shear wall plays a very important role in the field of earthquake resistance.Due to the complexity of building structure and the uncertainty of earthquake influence,the damage of shear wall after earthquake is very serious,the stressed components degrade in advance,the bearing capacity is reduced,and even collapse.However,the stressed components can not be replaced,so strengthening the structure becomes particularly important.Fiber reinforced composites are widely used in reinforcement because of their high strength,good durability and easy construction.In this paper,a hybrid reinforced shear wall structure is studied.FRP reinforcement is added to the concealed column at the corner of the shear wall to improve the stiffness of the shear wall in the later stage of loading.At the same time,the influence of height width ratio on the performance of the shear wall is also considered.The main conclusions are as follows:（1）The experimental results of SW-2 and FRPSW-2 shear walls are compared with the seismic performance indexes of SW-1 and FRPSW-1 shear walls completed by the research group in the early stage,and the effects of reinforcement form and aspect ratio on the mechanical performance of hybrid reinforced shear walls are obtained.（2）It can be seen from the test that under the condition of the same height width ratio,the bearing capacity of the hybrid reinforced shear wall increases slightly.When the test reaches the peak load,the bearing capacity of the hybrid reinforced shear wall decreases slowly at this stage.Under the condition of the same reinforcement form,the bearing capacity and stiffness of the hybrid reinforced shear wall with low height width ratio are greater.（3）The energy dissipation coefficient and equivalent viscous damping coefficient are used to evaluate the energy dissipation capacity of four shear walls.The calculation results show that the energy dissipation capacity of FRPSW-1 is good.Adding FRP reinforcement and lifting height width ratio can effectively improve the energy dissipation capacity of shear walls.（4）When the reinforcement forms are the same,the ductility of high shear wall is greater.When the height width ratio is the same,the ductility coefficient of the hybrid reinforced shear wall is greater,indicating that the addition of FRP reinforcement enhances the ductility of the shear wall,enhances the later stiffness,reduces the residual deformation,and can effectively resist the influence of aftershocks.（5）The finite element software ABAQUS is used to simulate the test.It is studied from the aspects of reinforcement stress,concrete stress,FRP reinforcement stress and tensile damage of concrete.It is found that the simulation results are basically consistent with the results presented by the test phenomenon.At the same time,the simulation is compared with the skeleton curve obtained from the test,and the trend of the curve is basically consistent.This result can prove that the simulation is effective.In order to explore the influence of more factors on the bearing capacity of shear wall,the distribution position of FRP reinforcement,the diameter of FRP reinforcement,the type of FRP reinforcement and the axial compression ratio are analyzed.（6）The finite element software ABAQUS is used to load four shear walls with seismic waves,and the structural dynamic analysis is carried out.The results show that the later stiffness of the hybrid reinforced shear wall is greater,which can effectively reduce the vertex displacement of the shear wall and have stronger resistance to seismic damage.