摘要
为研究变轴力对圆截面钢管混凝土框架柱抗震性能的影响,对6根钢管混凝土柱分别在4个水准地震作用下的子结构进行了拟动力试验。基于试验结果,分析了轴力变化、径厚比和柱子类型等参数对钢管混凝土柱滞回特性、刚度退化、耗能等性能的影响。最后采用Open SEES软件对钢管混凝土模型柱进行有限元分析,并与试验结果进行对比分析,结果表明:钢管混凝土柱破坏现象主要为柱子塑性铰区域钢管的局部屈曲;罕遇地震作用下,轴力变化导致钢管混凝土柱滞回曲线"捏缩效应"相比定轴力柱的滞回曲线更加明显;变轴力试验柱的侧向最大位移和极限荷载相对较小;理论分析结果和试验结果吻合良好,表明Open SEES软件可准确地模拟地震作用下钢管混凝土框架柱的力学特性。
To evaluate the impact of variable axial force on seismic behavior of circular CFST columns under earthquake,substructure pseudo-dynamic tests of six columns under four levels of earthquake excitation were conducted and the effect of the axial force,radius-thickness ratio and type of columns on the hysteretic behavior,stiffness degradation and energy dissipation of CFST columns were analyzed. A finite element analysis was performed and made comparison with the test results. The test results showed that the failure mode could be defined as the local buckling of the steel tube. It could be found that pinching effect in the hysteretic curves of variable axial force became more pronounced when compared with that of constant axial force. Besides,varying axial force could reduce the ultimate strength of concrete-filled steel tube column as well as ultimate displacement. The results of finite element analysis agreed well with experimental results,and indicated that the Open SEES could be used to accurately simulate the mechanical properties of frame column under the seismic action.
作者
张国伟
陈博珊
詹远
郭玉荣
高玉春
Zhang Guowei Chen Boshan Zhan Yuan Guo Yurong Gao Yuchun(Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material Beijing University of Civil Engineering and Architecture, Beijing 100044, China College of Civil Engineering Hunan University, Changsha 410082, China)
出处
《钢结构》
北大核心
2017年第6期31-38,共8页
Steel Construction
基金
教师队伍建设--青年英才计划(21147514036)
国家自然科学基金项目(51308026)
关键词
变轴力
钢管混凝土柱
子结构拟动力试验
有限元分析
variable axial force
CFST columns
substructure pseudo-dynamic test
finite element analysis
