横向冲击后圆钢管混凝土柱剩余轴压承载力研究  

Research on residual axial bearing capacity of CFST columns with circular cross-section subjected to lateral impact

作　　者：曾希 李锐 杜国锋[1] Zeng Xi;Li Rui;Du Guofeng(School of Urban Construction,Yangtze University,Jingzhou 434023,China)

机构地区：[1]长江大学城市建设学院

出　　处：《建筑结构》2019年第23期64-69,共6页Building Structure

基　　金：国家自然科学基金项目(51378077);湖北省自然科学基金项目(创新群体)(2016CFA022);中国石油科技创新基金研究项目(2016D-5007-0605)

摘　　要：为研究钢管混凝土构件横向冲击后的剩余轴压承载力,通过圆形截面钢管混凝土柱横向落锤冲击及竖向静力抗压试验,绘制了圆形截面钢管混凝土柱荷载-位移曲线及荷载-应变曲线,研究结果表明,试件最终破坏模式均为偏心破坏,呈现“弓”形;荷载-位移曲线经历了上升、峰值和下降三个阶段,随着冲击能量增大,试件剩余承载力降低;试件纵向应变值要大于横向应变值,处于试件弯曲凹面的纵向应变增长速度最快,始终受压,处于试件凸面的纵向应变由初始受压转为最终受拉;得到了剩余承载力系数与试件长细比、约束效应系数、冲击能量的关系曲线。In order to study the residual bearing capacity of concrete-filled steel tubular(CFST)columns subjected to lateral impact,the load-displacement curves and load-strain curves of CFST columns with circular cross-section were obtained by means of drop hammer impact test and vertical static compression test.The results show that the ultimate failure mode of the specimens is eccentric failure,showing a“bow”shape.In the three stages of rising,peak and falling of loaddisplacement curve,the residual bearing capacity of specimens decreases with the increase of impact energy;the longitudinal strain value of specimens is larger than the transverse strain value,and the longitudinal strain on the concave surface of the bending specimens grows fastest and is always under compression,and the longitudinal strain on the convex surface of the specimens changes from initial compression to final tension;the relationship curves of residual bearing capacity coefficient with slenderness ratio,restraint effect coefficient and impact energy are obtained.

关 键 词：钢管混凝土柱 竖向剩余轴压承载力 破坏形态 

分 类 号：TU318[建筑科学—结构工程]