摘要
为研究多腔钢管混凝土异形柱在不同加载方向的性能差异,设计并制作了5个1/30缩尺多腔钢管混凝土异形柱模型试件,截面构造包括13腔体基本型截面和5腔体简化型截面,基本型试件包括沿截面长轴加载、短轴加载和与长轴成45°方向加载的试件,简化型试件包括沿截面长轴加载和短轴加载试件。采用拟静力试验方法,对各试件的破坏特征、滞回性能、承载力、刚度退化、延性以及耗能能力进行研究。结果表明:各试件屈服位移角均值为1/92,破坏位移角均值为1/30,具有良好的延性;对于基本型试件,随着加载方向由长轴转向短轴,承载力及耗能能力逐渐降低,不同加载方向的性能差异显著;简化型试件的承载力较基本型试件的小,但具有更好的延性,耗能能力相当,且不同加载方向性能差异较小。使用ABAQUS有限元软件进行数值模拟,所得模拟结果与试验结果吻合良好,由此进一步分析了钢筋笼、轴压比以及混凝土强度对异形钢管混凝土柱受力性能的影响,结果显示:钢筋笼能够提高试件承载力;随着轴压比增大,试件延性和承载力逐渐降低;试件承载力随混凝土强度增大而增大。
In order to study the differences in loading behavior of specially-shaped multi-cell concrete-filled steel tubular columns(CFST)loaded along different directions,five 1/30 scaled CFST specimens were designed.The specimens have two types of cross-section:13-cell type(basic)and 5-cell type(simplified).Basic-type specimens were loaded along long axis,short axis and 45°directions,respectively,while simplified-type specimens were loaded along long axis and short axis.Failure patterns,hysteretic characteristics,bearing capacity,stiffness degradation,ductility and energy-dissipating capacity were analyzed through quasi-static test.The results show that the average yielding drift ratio and damage drift ratio of specimens are 1/92 and 1/30,respectively,demonstrating good ductility of CFST.The bearing capacity of basic-type specimens decreases while their ductility improves with loading directions changing from long axis to short axis.Significant differences in behavior can be observed when specimens were loaded along different directions.Though the bearing capacity of simplified-type specimens is lower than that of basic-type specimens,their ductility is better and their behavior doesn’t have significant differences when loaded along different directions.Numerical simulation results by ABAQUS show good agreement with experimental results including stiffness,yielding load,yielding displacement,peak load and peak displacement.The influence of reinforcement cage,axial compression ratio and concrete strength on the behavior of specially-shaped CFST were analyzed.Analysis results show that the reinforcement cage can improve the bearing capacity which increases with the increasing of concrete strength;on the other hand,the bearing capacity and ductility decrease with the increasing of axial compression ratio.
作者
殷飞
薛素铎
曹万林
董宏英
武海鹏
YIN Fei;XUE Suduo;CAO Wanlin;DONG Hongying;WU Haipeng(Key Lab of Urban Security and Disaster Engineering of China Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2019年第11期150-161,共12页
Journal of Building Structures
基金
国家自然科学基金项目(51578020)
北京市自然科学基金项目(8182005)
