HSRC框架柱的恢复力特性  

Characteristics of Restoring Force of High Strength Reinforced Concrete Frame Columns

作　　者：李正良[1] 冯宏[1] 陈永庆[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《西南交通大学学报》2010年第6期888-892,共5页Journal of Southwest Jiaotong University

基　　金：重庆市建设委员会基金资助项目(重庆市建设委员2004第25号)

摘　　要：为了对在地震作用下的构件受力性能全过程进行动力分析,通过对19根参数不同的剪跨比λ≥3型钢高强混凝土框架柱的低周反复加载拟静力试验结果进行分析,运用试验拟合法,模拟了型钢高强混凝土框架柱的无量纲骨架曲线和无量纲标准滞回环,得出了型钢高强混凝土框架柱的刚度退化规律,建立了型钢高强混凝土框架柱的恢复力模型.实验结果表明:无量纲骨架曲线可以用4折线表示;无量纲标准滞回环可以用3折线表示,每循环一周,刚度退化就更严重一些,循环一周后不指向原来卸载点,产生超前指向;从屈服点到极限点之间的刚度退化随着水平位移绝对值的增加而加大.A restoring force model was necessary for dynamic analysis of members under seismic action.In this paper,by analysis of the test results of low cyclic reversed loading experiments conducted on totally 19 steel reinforced high-strength concrete（HSRC） columns with different parameters（the slenderness ratio λ≥3）,the dimensionless skeleton curves,dimensionless hysteresis loops,and stiffness degradation rules of the HSRC columns were simulated using the experimental fitting method.Based on these simulations,a restoring force model was established for the HSRC columns.The results show that the dimensionless skeleton curves can be expressed by a four-segment polygonal line;the dimensionless hysteresis loops can be expressed by a three-segment polygonal line;after each cycle,the stiffness degradation become more serious,and the curve returns but overshoots the original unloading point;the stiffness degradation between the yield point and limit point increases with an increase in the absolute horizontal displacement.

关 键 词：HSRC框架柱 低周反复加载 骨架曲线 滞回环 刚度退化 恢复力模型 

分 类 号：TU398.2[建筑科学—结构工程]