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Experimental study on the restoring force model of shear wall supported on the frame with steel reinforcing

LI Guoqiang1,CUI Daguang1,2(1.State Key Laboratory for Disaster Mitigation in Civil Engineering,Tongji University,Shanghai 200092,China;2.Architectural Design and Research Institute of Shanghai Tongji Kaiyuan,Shanghai 200092,China)  
The structure of shear wall supported on frame has been used widely.In order to improve the seismic performance of this structure,the paper proposed to use steel reinforced concrete transfer beams and frame-supported columns.Combined vertical load and monotonic and low cyclic lateral load pseudo-static tests were carried out on four one-forth-scale specimens,three consisting steel members encased in beams and columns.The structural load-bearing capacity,deformation,stiffness,ductility,energy dissipation capability and failure modes were discussed.The testing results indicate that the structural performance indexes are improved with steel reinforcement,and ductility coefficient is 2.29-3.43 times larger than that of structures without steel reinforcement.Based on the theoretic formulas and testing data,the three trilinear restoring models under monotonic and low cyclic load were established with degradation of strength and stiffness taken into account.The models show good agreement with the testing results.
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