装配式复式钢管混凝土节点抗震性能试验  

Study on seismic performance of prefabricated CFDST joint

作　　者：樊军超 赵均海[1] 尤浩镪 FAN Junchao;ZHAO Junhai;YOU Haoqiang(School of Civil Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《哈尔滨工业大学学报》2023年第10期49-62,共14页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51878056)。

摘　　要：提出一种便于灾后修复的装配式复式钢管混凝土节点。为明确端板厚度、柱轴压比、螺栓直径、混凝土填充度和内钢管截面形状对节点抗震性能的影响,对6个缩尺比为1∶2的节点试件进行拟静力试验,研究了节点的承载力、延性、刚度退化、承载力退化和耗能能力。结果表明:节点的破坏形态包含端板弯曲、钢梁翼缘屈曲、端板与翼缘间焊缝开裂和螺栓翘曲断裂;6个试件的荷载-位移滞回曲线饱满,表明节点具有较强的耗能能力;位移延性系数均大于4.89,具有良好的塑性变形能力和延性;强度退化系数基本保持在0.9~1.0,表现出良好的承载力稳定性;增大端板厚度,可显著提高节点的各项抗震性能指标;增大柱轴压比、提高混凝土填充度和方钢管代替内圆钢管均会提高节点承载力,而螺栓直径几乎不影响节点承载力;改变柱轴压比和螺栓直径对节点耗能影响极小,提高混凝土填充度和方钢管代替内圆钢管均会明显降低节点耗能能力。建立的非线性有限元模型得到的节点破坏形态、承载力与试验结果吻合良好。This paper introduces a prefabricated concrete-filled double-skin steel tubular(CFDST)joint designed for easy repair following a disaster.To investigate the influence of endplate thickness,axial compression ratio,bolt diameter,concrete filling degree and shape of inner steel tube on the seismic performance of the joints,quasi-static tests were performed on six scaled 1∶2 joint specimens.The bearing capacity,ductility,stiffness degradation,strength degradation,and energy dissipation capacity of the joints were analyzed.The failure modes of joints included endplate bending,flanges buckling,weld cracking between endplate and flange,bolt warpage,and bolt fracture.The load-displacement hysteretic curves were plump,indicating the joint has good energy dissipation capacity.The displacement ductility coefficients of joints were greater than 4.89,indicating that the joint has good plastic deformation ability and ductility.The strength degradation coefficients were basically maintained at 0.9-1.0,showing good bearing capacity stability.Increasing the endplate thickness significantly improved the seismic performance of the joint.Increasing the axial compression ratio,the concrete filling degree,and replacing the inner circular steel tube with a square steel tube increased the bearing capacity of the joint,and changing the bolt diameter had little effect on the bearing capacity.Changing the axial compression ratio and the bolt diameter had little effect on the energy dissipation of the joint.Increasing the concrete filling degree and replacing the inner circular steel tube with a square steel tube noticeably decreased the energy dissipation of the joint.The failure modes and bearing capacity of the joint obtained by the established nonlinear finite element model were in good agreement with the test results.

关 键 词：复式钢管混凝土 装配式节点 拟静力试验 抗震性能 有限元模拟 

分 类 号：TU398[建筑科学—结构工程]