Experimental Study On Seismic Performance Of A Self-centering Shear Wall With Replaceable BRBs At Base

The self-centering wall structure is mainly developed on the basis of the rocking wall structure.The self-centering wall structure is formed by adding the self-centering device to the rocking wall structure.The replaceable component structure is a structure that can quickly restore the function by changing damaged component after the earthquake.The self-centering shear wall with BRB at base of the study combines the characteristics of several structural forms.In this paper,a self-centering shear wall with BRB at base is studied.The corner fragile position of the ordinary self-centering shear wall is replaced by BRB.BRB dissipates seismic energy through tension and compression in the earthquake to protect the wall from damage.The prestressed device of the specimen is prestressed steel strand.The wall is self-centering after earthquake through steel strand and its own gravity.The main work and conclusions of this paper are as follows :In this paper,the quasi-static test of self-centering shear wall with BRB at base is carried out.The crack and BRB deformation damage phenomena of the wall and the test data of thrust,displacement and strain of the specimen are recorded.The energy dissipation capacity,self-centering capacity,stiffness degradation,strength degradation and ductility of the wall are analyzed.The results show that the wall proposed in this paper has good energy dissipation capacity,and has a certain self-centering capacity.The wall has less damage after the earthquake,and the damage is concentrated on the BRB.After the first quasi-static test,the damaged BRB of the specimen was replaced,and the same test as the first quasi-static test was carried out.Through the comparison of the two test results,the results show that the self-centering shear wall with BRB designed in this paper has better earthquake-resilience performance after earthquake.ABAQUS finite element software was used for numerical simulation of the specimen in this paper,and the results were compared with the experimental results.The results were in good agreement.The calibrated finite element model is used to analyze the variable parameters.The main parameters are the initial prestress value of steel strand,the cross-sectional area of BRB and the number of prestressed steel strands.The results show that the initial prestress of prestressed steel strand has little effect on the energy dissipation capacity and bearing capacity of the wall,has large effect on the self-centering capacity of the wall.BRB cross-sectional area has a great influence on the energy dissipation capacity,self-centering capacity and bearing capacity of the wall.The number of steel strands has great influence on the energy dissipation capacity,self-centering capacity and bearing capacity of the wall.In order to study the theoretical design method of self-centering shear wall,the skeleton curve and hysteresis curve are derived and calculated,and the theoretical calculation results are compared with the experimental and numerical simulation results.Further determine the wall self-centering conditions.This method can provide reference for the design and calculation of self-centering shear wall.