钢管混凝土梁柱加强环螺栓节点受力性能优化研究

Optimal analysis on mechanical behavior of exterior diaphragm bolt joints of concrete-filled steel tubular beam and column

为研究具有不同构造形式的加强环螺栓连接节点的力学性能,基于圆钢管混凝土柱-钢梁外加强环螺栓连接节点单调加载试验结果,采用合适的混凝土与钢材本构模型,通过ABAQUS建立该类节点的三维精细化有限元分析模型;对比分析试验和模型的受力特征和破坏形式,验证了数值模型的可靠性;与加强环焊接刚接节点对比,通过对不同构造措施下的加强环螺栓连接节点进行数值模拟,分析结果表明:加强环上采用4排螺栓并加设腹板加劲肋和环板加劲肋的加强环螺栓连接节点可达到全焊加强环刚接节点的初始刚度和抗弯承载力。

In order to investigate the mechanical properties of bolted joints with exterior diaphragm in different structural forms,this paper is based on the monotonic loading test results of bolted joints between circular concrete filled steel tubular(CFST)column-H-shaped steel beam with exterior diaphragm.Appropriate constitutive models of concrete and steel are adopted.Subsequently,finite element software ABAQUS is used to build an elaborate 3 D solid finite element model(FEM)of the joints.By comparison,it is found that the numerical results agreed well with the mechanics characteristics and failure forms of the experiment,verifying the reliability of the FEM.Finally,taking a traditional welded exterior diaphragm plates rigid connection joint as the benchmark,the numerical simulation of bolted joints with exterior diaphragms under different construction measures are compared.The analysis results show that when four rows of bolts are provided on the structural diaphragms,the steel beam web is welded with stiffeners,and the top and bottom diaphragms are also added with stiffeners,this type of bolted joints with external diaphragms can achieve initial rigidity and flexural capacity of fully welded exterior diaphragm plates rigid connection.