钢管混凝土柱-钢梁刚接节点拉弯受力性能研究及有限元分析  

Performance of CFST-steel beam rigid connection under combined moment and tension

作　　者：徐嫚[1,2] 高山[3,4] 王玉银[3] 郭兰慧[3] 

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [4]列日大学应用科学学院

出　　处：《建筑结构学报》2013年第S1期89-95,共7页Journal of Building Structures

基　　金：东北林业大学中央高校基本科研业务费专项资金项目(DL13BB07)

摘　　要：在正常使用荷载作用下,梁柱节点将承受负弯矩的作用,然而当结构中关键柱受到破坏而失效后,荷载向下的传力路径被切断,由柱承担的荷载转而由与之相连的梁来承担,此时梁柱节点将承受正弯矩和拉力的共同作用。为研究钢管混凝土柱-钢梁刚接节点在拉弯共同作用下的力学性能,共完成了2个钢管混凝土柱-钢梁刚性节点的试验,并建立了相应的有限元模型,进行了节点拉弯性能的参数分析。研究结果表明:外环板节点和外伸内隔板节点的初始刚度相近,均能满足刚接节点对初始刚度的要求;节点弯矩-拉力关系曲线表现为随着拉力的增大,其受弯能力不断降低,但初期降低不显著;不同初始弯矩条件下,拉力对节点受弯承载力均有不同程度的降低,初始弯矩越低,在受荷初期拉力对其受弯承载力的影响越小。Beam-to-column connections are subjected to negative bending moment after service loads are applied to structures.However,when the vertical load path are cut off which is caused by column removal,the loads supposed to be sustained by the removed column are consequently sustained and spread by the beams connected to the removed column.In this case,the beam-to-column connections are under combined sagging moment and tension.In order to investigate the behavior of CFST-steel beam rigid connection under combined moment and tension,two kinds of common rigid connections were tested.The finite element models of the specimens were also developed and analyzed.The experimental and numerical results show that outer-ring connection has similar initial stiffness with overhanging diaphragm connection.They can both be considered as rigid connection.With the increase of tensile loads,the moment resistance of connections is decreased consequently.Tensile loads would influence the moment resistance of connections even under different initial moment level.Lower initial moment level would decrease the influence that tensile forces have on moment resistance of connection.

关 键 词：钢管混凝土结构 刚性节点 静力试验 有限元分析 受力性能 

分 类 号：TU398.9[建筑科学—结构工程]