RC环梁式圆钢管约束SRC柱-狗骨式钢梁节点抗震性能研究  

An Investigation on the Seismic Behavior of Circular Steel Tube Confined SRC Column-RBS Joints with RC Ring Beam

作　　者：聂少锋[1] 张犇 叶梦娜 王硕 韩勇 NIE Shaofeng;ZHANG Ben;YE Mengna;WANG Shuo;HAN Yong(School ofCivil Engineering,Chang'an University,Xian710061,China;Sunac North ChinaGroup Xi'an Company,Xi'an710065,China)

机构地区：[1]长安大学建筑工程学院,西安710061 [2]融创中国华北区域集团西安公司,西安710065

出　　处：《建筑钢结构进展》2022年第9期1-11,共11页Progress in Steel Building Structures

基　　金：国家自然科学基金(51408052);陕西省重点研发计划项目(2021SF-519);陕西省青年科技新星项目(2016KJXX-51)。

摘　　要：对RC环梁式圆钢管约束型钢混凝土柱-狗骨式削弱型钢梁节点在低周反复荷载作用下的抗震性能开展数值研究。在验证有限元模型正确性的基础上,研究了狗骨式梁端翼缘削弱参数、梁柱线刚度比和柱轴压比对该节点破坏模式、滞回性能、骨架曲线等的影响。结果表明:对钢梁梁端进行狗骨式削弱,可使节点塑性铰位置明显外移,起到保护RC环梁及节点区的作用,从而更好地满足“强节点弱构件”的抗震要求;梁端削弱参数对RC环梁的破坏程度和梁端塑性铰位置影响较大;在合理削弱参数范围内,狗骨式节点基本试件的最大荷载较未削弱型节点的最大荷载降低了5.95%,节点位移延性系数均大于4.4,表明狗骨式节点具有良好的抗震性能;随着梁柱线刚度比的增大,RC环梁破坏越严重;节点最大荷载和延性随柱轴压比的增大而降低,建议轴压比取值不大于0.7。The seismic performance of the joint of circular steel tube confined concrete(SRC)columns and reduced beam section(RBS)under low cycle reversed loading is studied.Based on verifying the correctness of the finite element model,the influences of the weakening parameters,the linear stiffness ratio of the beam to column,and the axial compression ratio of the column on failure mode,hysteretic performance,skeleton curve,are analyzed in details.The results show that the plastic hinge of the joint moves outward obviously through weakening the beam end.The RC ring beam and joint zone are protected effectively,which meets the requirement of“strong joint and weak member”.The weakening parameters of RBS joints have a significant influence on the damage of the RC ring beam and the plastic hinge position of the steel beam.If the weakening parameters are in the reasonable range,the difference between the maximum load of the basic RBS joint and that of the non-weakened joint is reduced by 5.95%.The displacement ductility factors of the joints are larger than 4.4,which indicates that the RBS joint has a good seismic performance.With the increase of the linear stiffness ratio of beam to column,the damage of the RC ring beam is more severe.The maximum load and ductility of the joints decrease with the increase of the axial compression ratio of column.Therefore,the axial compression ratio should not be larger than 0.7.

关 键 词：圆钢管约束型钢混凝土柱 RC环梁节点 狗骨式削弱钢梁 抗震性能 数值分析 

分 类 号：TU352.11[建筑科学—结构工程] TU398