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《Journal of Building Structures》 2010-08
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Axial behavior of thin-walled steel stub columns filled with demolished concrete segment/lump

WU Bo1,LIU Wei1,2,LIU Qiongxiang2,XU Zhe1,2(1.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;2.Shenzhen General Institute of Architectural Design and Research,Shenzhen 518000,China)  
Twenty thin-walled steel stub columns filled with demolished concrete segment/lump(DCS/L) or cast-in-situ concrete(CC) were tested under axial loading.The influence of such factors as type of demolished concrete(DC),mix ratio of DC,and strength difference between CC and DC,on measured load-deformation curves of the specimens were investigated.According to domestic and foreign formulas for concrete filled steel tubular column,the axial load bearing capacities of the specimens were calculated and compared with the test results.A comparison was conducted between the axial load bearing capacities of the specimens and those of reinforced concrete stub columns whose sectional dimensions and steel ratios were the same as those of the specimens.Test results show that: a) the axial load bearing capacity of the column filled with DCS is larger than that of the column filled with DCL when their mix ratios of DC are similar.b) the mix ratio of DC within the range of 25%-35% has little effect on the axial load bearing capacity of the column filled with DCL.c) the mix ratio of DC within the range of 35%-50% has little effect on the axial load bearing capacity of the column filled with DCS.d) within the ranges of mix ratio mentioned above,the axial load bearing capacities of the columns filled with DCS/L are close to those of the columns filled with CC when the strength difference between CC and DC is less than 15MPa.
【Fund】: 广东省科技计划项目(2009B060700094);; 亚热带建筑科学国家重点实验室人才培养基金项目(2008ZB15);; 华南理工大学中央高校基本科研业务费重点项目(2009zz0046)
【CateGory Index】: TU398.9
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