节点等代建模的索穹顶结构模型连续倒塌分析

Progressive collapse analysis of cable dome structure model with equivalent joints

采用非线性动力分析方法,利用一组线单元模型等效替代节点实体模型,对Geiger型索穹顶结构模型进行节点等代建模的连续倒塌分析,并将仿真分析结果与试验实测数据进行对比。有限元分析结果表明:移除单根索后,数值模拟得到的结构破坏形态、杆件内力以及节点位移变化均与试验结果吻合良好,验证了所提出的节点等代建模方法的有效性,为索结构的精细化连续倒塌仿真分析提供参考。

By using the nonlinear dynamic analysis method,a group of linear element models were used to replace the solid joint model to carry out the progressive collapse analysis of the Geiger cable dome structure model with the joint equivalent model,and the results of the simulation analysis were compared with the experimental data.The finite element analysis results show that the failure modes,internal forces and joint displacements obtained by numerical simulation are in good agreement with the experimental results after the removal of a single cable,which verifies the effectiveness of the proposed joint equivalent modeling method and provides a reference for the refined progressive collapse simulation analysis of cable structures.