钢管混凝土柱-钢梁节点的力学性能分析

基于弹塑性有限元理论建立了钢管混凝土柱-钢梁节点荷载-位移全过程非线性有限元模型,在单元分析中采用改进的AUL表述推导得到梁柱单元刚度矩阵方程,同时考虑了材料的物理非线性和单元的几何非线性,并编制了非线性有限元程序NLFEACFST。采用该模型对相关研究者和作者进行的节点试验进行了分析,理论计算结果与试验结果比较表明,该模型具有很好的适用性和精度。在理论分析模型得到试验结果验证的基础上,对典型的中柱节点进行了荷载-位移全过程非线性特性分析,并对影响节点承载力和荷载-位移骨架曲线的因素进行了参数分析,为进一步从理论研究钢管混凝土框架结构的力学性能创造了条件。

Nonlinear finite element analysis of steel beam to concrete-filled steel tubular column connection

A nonlinear finite element model was developed,based on the elasto-plastic finite element theory,to analyze the load vs deformation relation of the steel beam to concrete-filled steel tubular column connection.The beam-column element is analyzed using approximate updated Lagrangian formulation to obtain the stiffness matrix,in which material and geometric nonlinearities are considered.Accordingly,a program for the nonlinear finite element analysis of concretefilled steel tubular connection was obtained.The model was used to analyze the experiments on the steel beam to concrete-filled steel tubular column connections conducted by related researchers and authors herein.It was shown from the comparisons between the calculated and tested results that the model has good applicability and precision.On the base of the verification by the tested results,the nonlinear load vs deformation relation characteristics of the typical connection was studied,and the influences on the load and load vs deformation skeleton curves of the essential parameters were discussed.The work in this paper provides a basis for further theoretical research on the behaviors of the concrete-filled steel tubular frames.