SRC梁-CFT柱节点受力性能研究

Research on mechanical behavior of connections between steel reinforced concrete beams and concrete-filled steel tubular columns

型钢混凝土(SRC)梁-钢管混凝土柱(CFT)节点具有承载力高、刚度大、延性好等优点。以银川国际机场T3航站楼SRC梁-CFT柱节点为原型,基于商用软件ABAQUS建立了综合考虑材料非线性、几何非线性以及钢材和混凝土之间界面特性的有限元分析模型,并利用已有试验结果对该模型进行了试验验证。在此基础上,对型钢混凝土梁-CFT柱节点的受力性能、破坏机理、承载能力及延性等进行了非线性有限元分析研究。研究表明,节点具有较大的承载能力与延性,满足工程安全性要求;节点破坏机制为梁铰破坏;水平荷载-位移曲线表明节点强度、刚度退化缓慢。

Connections between pre-stressed steel reinforced concrete （SRC） beams and concrete-filled steel tubular （CFT） columns are characterized with good bearing capacity, stiffness, ductility and the like. Taking the connections between steel reinforced concrete beams and concrete-filled steel tubular columns in the T3 terminal building of Yincbuan international airport as the prototype, the paper established the nonlinear finite element analysis （FEA） models by the aid of ABAQUS software, and the large nonlinear geometric deformation, material nonlinear property and interface property between steel tube and concrete were incorporated into the model. Based on existing experimental results, the paper presented the research on mechanical behavior, failure mechanism, bearing capacity and ductility of the connections through the nonlinear FEA. Results show that the connections not only show good bearing capacity and ductility but also meet the requirements of safety, and the failure mechanism of connections is typical beam hinge failure, finally the relationship curve between the horizontal load and displacement indicates that the bearing capacity and stiffness of the connections degrade slowly.