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Experimental study on seismic behavior of double thin skin hybrid walls filled with demolished concrete lumps

WU Bo1,LIU Chunhui1,ZHAO Xinyu1,LIU Qiongxiang2(1.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China; 2.Shenzhen General Institute of Architectural Design and Research,Shenzhen 518000,China)  
Quasi-static tests of seven double thin skin hybrid walls filled with demolished concrete lumps(DCLs) were conducted,the influences of various parameters(i.e.,mix ratio of demolished concrete,thickness of steel plate,axial load ratio,rib plate spacing,height-width ratio) on the seismic behavior of specimens were investigated.Based on the concept of combined strength of new and old concrete,lateral load carrying capacities of the specimens were calculated approximately,and compared with those of reinforced concrete walls with similar total steel weight.Test results show that:(a) the influences of the mix ratio of demolished concrete within a range of 0~33% on the initial lateral stiffness,lateral load carrying capacity,destructive drift ratio,energy dissipation capacity,and shape of hysteretic curves of the specimens are limited;(b) the axial load ratio of a double thin skin hybrid wall filled with DCLs should be less than 0.35;(c) even the ratio of wall thickness to steel plate thickness is 120,the hysteretic behavior and deformation capacity of a double thin skin hybrid wall filled with DCLs are still well.Its ultimate drift ratio can meet the requirement of the Chinese seismic design code;(d) the energy dissipation capacity of a double thin skin hybrid wall filled with DCLs is similar to or a little larger than that of a reinforced concrete wall;and(e) in the case where the sectional area and total steel weight are close,the lateral load bearing capacity of a double thin skin hybrid wall filled with DCLs is similar to that of a reinforced concrete wall.
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