实腹式型钢混凝土十字形柱抗震性能研究  

Research on seismic behavior of solid-web steel reinforced high-performance concrete cross-shaped column

作　　者：李凯文[1,2] 王玉玲[2] 万鑫[2] 张波[3] 

机构地区：[1]无锡环境科学与工程研究中心,无锡214153 [2]无锡城市职业技术学院,无锡214153 [3]同济大学结构工程与防灾研究所,上海200092

出　　处：《建筑结构》2015年第22期80-84,共5页Building Structure

基　　金：江苏省第四期"333工程"培养资金省级资助项目(BRA2012027)

摘　　要：对4个不同轴压比、配钢率、加载方向的实腹式型钢混凝土十字形柱进行了低周反复加载试验,通过观测试件各阶段的开裂变形及破坏形态,并分析其破坏机理,得到其荷载-位移滞回曲线、骨架曲线、刚度退化、强度衰减、耗能能力及位移延性系数。通过分析试件的位移延性系数,得到影响实腹式型钢混凝土十字形柱延性的主要因素。结果表明,实腹式型钢混凝土十字形柱试件在其剪跨比为3.25时发生弯曲破坏形态;轴压比较高时,试件强度衰减幅值较小,试件达到极限承载力后刚度退化较快,延性降低;配钢率加大,试件极限承载力有较大提高,强度衰减和刚度退化相对平稳;相同条件下,沿45°方向加载的试件极限承载力比沿工程轴加载的试件极限承载力高,且达到极限承载力后刚度退化较快。A series of low cyclic loading tests were carried out on 4 solid-web steel reinforced concrete cross-shaped columns with different axial compression ratios,steel ratios and loading directions. Through the observation of cracking and failure modes in each process and analysis of failure mechanism,the load-displacement hysteresis curves were obtained as well as skeleton curves, stiffness degradation, strength degradation, energy dissipation capacity and displacement ductility coefficients. The main factors which influence the ductility of the column were studied by analyzing displacement ductility coefficients. The test results indicate that the column will bend failure with the shear span ratio of 3. 25. When the axial pressure is relatively high,the attenuation amplitude of the specimen strength is smaller,and the stiffness degradation is faster while the ductility decreases. When the steel ratio increases,the ultimate bearing capacity of the specimen is improved,and the strength attenuation is relatively smooth as well as stiffness degradation. Under the same conditions,the ultimate bearing capacity of the specimen along the loading direction of 45° is higher than that of the specimen along the loading direction of engineering axis,and the stiffness degradation of the former one is more rapid than the latter one.

关 键 词：十字形柱 实腹式型钢 轴压比 配钢率 抗震性能 

分 类 号：TU398.7[建筑科学—结构工程]