摘要
通过4个仿古建筑方钢管混凝土柱（CFST）与钢筋混凝土圆柱（RC）连接的低周反复加载试验,观察了试件在不同轴压比下的破坏形态,分析了试件的滞回曲线、骨架曲线、变形能力、耗能能力、刚度退化及承载力衰减等。试验结果表明：CFST-RC柱连接的破坏形态以弯曲破坏为主,且有一定的剪切破坏特征,CFST柱及RC柱根部均形成塑性铰,RC柱中、上部出现较为明显的剪切斜裂缝;滞回曲线较为饱满,刚度退化及承载力衰减较慢,破坏时试件的位移延性系数介于4.42-5.54之间,等效黏滞阻尼系数介于0.233-0.311之间,具有良好的变形及耗能性能。在试验设计的轴压比范围内,增大轴压比,试件的峰值荷载和延性提高;当轴压比相同时,随长细比增大,试件的峰值荷载和延性降低。
According to the experiments of four imitated ancient building connections between concrete filled square steel tubular columns （CFST） and reinforced concrete circular columns （RC） under low cyclic reversed loading, the failure modes under different axial compression ratios were obtained. The hysteretic loops, skeleton curves, deformability, energy dissipation capacity, stiffness degradation and strength degradation were analyzed. It is shown that the failure modes of CFST-RC column connections are flexural failure, with some characteristics of shear failure. Plastic hinges are formed at the root of CFST column and RC column, and there are obvious shear oblique cracks in the middle and upper part of RC column. The hysteretic loops are full, and the connections have insignificant stiffness degradation and strength degradation. As the connections fail, the ductility factor is between 4.42 and 5.54, and the equivalent viscous damping ratio is between 0. 233 and 0. 311, showing excellent deformation capacity and energy dissipation capacity. In the range of experimental axial compression ratio, the peak load and ductility of the connections increase with the increase of the axial compression ratio. The peak load and ductility of the connections with the same axial compression ratio decrease with the increase of slenderness ratio.
作者
薛建阳
马林林
林建鹏
吴琨
葛鸿鹏
XUE Jianyang1 , MA Linlin1, LIN Jianpeng 1, WU Kun2 , GE Hongpeng2(1. School of Civil Engineering, Xi＇ an University of Architecture and Technology, Xi＇ an 710055, China; 2. China Northwest Architecture Design and Research Institute Co., Ltd, Xi＇an 710018, Chin)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第4期37-44,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51678478)
中建股份科技研发课题(CSCEC-2012-Z-16)
关键词
仿古建筑
CFST-RC柱连接
轴压比
拟静力试验
抗震性能
imitated ancient building
CFST-RC column connection
axial compression ratio
quasi-static test
seismic behavior
