钢管初应力对钢管混凝土节点力学性能影响研究  

Research on Behavior of the Joint with Concrete-filled Steel Tubular Column Under Pre-load in Steel Tube

作　　者：史艳莉[1] 王双[1] 王文达[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《工程抗震与加固改造》2012年第6期19-24,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：甘肃省建设科技攻关项目(JK2011-16)

摘　　要：钢管混凝土结构中的钢管在施工期间首先作为施工支撑和混凝土浇筑模板,因此钢管中已存在初始的应力。基于ABAQUS软件,对有初应力的钢管混凝土构件进行了数值分析,理论计算结果与试验结果吻合良好。在此基础上对有钢管初应力的钢管混凝土柱-钢梁节点力学性能进行了数值模拟和参数分析。结果表明:钢管初应力的存在使得钢管混凝土节点极限承载力有一定程度降低;参数分析结果表明,钢管初应力对节点承载力的降低随柱轴压比和长细比的增大而趋于更加明显,而梁柱强度比和梁柱线刚度比的变化对其影响不明显。The hollow steel tubes of concrete-filled steel tubular（CFST） structure have initial stress because they are served as construction support and concrete casting framework during construction stage.The CFST members with pro-load in steel tubes are analyzed using ABAQUS,and the numerical results are matched well with the others＇ experiments.The composite joints with CFST column and steel beam are simulated based on the same numerical model under the pre-load in the hollow steel tubes or not.Parametric study is performed to investigate the performance of the joints under the parameters,the axial load ratio of column,slenderness ratio,the beam to columns strength ratio and beam-column linear stiffness ratio.The results show that the ultimate strength of the composite joints is slightly decreased because of the initial stress in steel tubes in general.The descend of the ultimate strength of the joints with pro-load in steel tubes became much more evident with the incremental axial load ratio and slenderness ratio of the CFST column.It is not obvious change for the joint with the incremental beam to columns strength ratio and beam-column linear stiffness ratio.

关 键 词：钢管混凝土 钢管初应力 钢梁 节点 力学性能 

分 类 号：TU398.9[建筑科学—结构工程]