摘要
为了对四肢钢管混凝土格构柱构件的变形及受力特征进行分析,进行了轴压试验。该试验在5 MN的压力试验机上进行,以长细比为参数,共计7个试件,用IMP数据采集系统采集数据。试验结果表明:长细比越大,格构柱整体性变形越来越显著;钢管混凝土格构柱各柱肢均处于小偏压受力状态,构件具有非常好的变形性能;格构柱达到极限承载力时,各柱肢均早已进入塑性阶段。因此,格构柱的极限承载力基本上随长细比的增大而减少;初始缺陷对极限承载力也有较大影响。
Seven four-legged concrete-filled steel tubular（CFST） laced columns were tested with axial loads in a 5 MN pressure tester using an IMP data acquisition system to investigate the deformation and load behavior.The load-deflection curves,deformation,and ultimate load carrying capacities were analyzed with the slenderness ratio as the test parameter.The results show that the deformability of the laced columns becomes more like full-web columns as the slenderness ratio increases.All the CFST legs bore minor eccentric compression,and all models had good deformation capacity.The steel tubes yielded before the ultimate load;thus,the ultimate bearing capacities decrease with increasing slenderness ratio.Initial imperfection also affects the bearing capacity.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第12期1919-1924,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(50438020)
关键词
钢管混凝土
格构柱
轴压荷载
concrete-filled steel tubular column
laced column
axial load
