钢管混凝土框架穿心节点连续倒塌数值模拟

Numerical simulation of progressive collapse of concrete-filled steel tube frame with continuous web plate joint

为了研究穿心节点形式对钢管混凝土柱—钢梁连续倒塌的影响及不同参数下的力学性能,利用ANSYS有限元软件,采用非线性静力方法对2层2跨的穿心节点平面钢管混凝土框架进行抗连续倒塌性能研究,主要研究在中柱失效后框架的剩余结构在内力重分布过程中的受力特性、传力机制,并着重分析不同的节点连接形式对平面框架抗连续倒塌性能的作用,探讨了钢梁截面高度等重要参数对关键柱破坏后框架抗连续倒塌性能的影响。结果表明,穿心节点平面框架的抗拉性能优于不穿心节点平面框架的,在结构体系中能更充分发挥"悬索作用"阶段结构体系的性能;增大框架钢梁截面高度能显著提高结构在过渡阶段和悬索阶段的性能。

In order to study the influence of continuous web plate joints on the progressive collapse of concrete-filled steel tube（ CFST） column and its mechanical properties under different parameters,a nonlinear static analysis with ANSYS finite element software was carried out on a 2-span-2-layer continuous web plate joint plane across a CFST frame. The research focused on the mechanical characteristics and the transfer mechanism of the remaining structure of the frame in the redistribution of internal forces and analyzed the effects of different forms of connection nodes on the progressive collapse of plane frame. The influence of girder section height and other important parameterson frame performance after the destruction of a key pillar in the progressive collapse was explored.The results show that plane frame with continuous web plate joint has better tensile properties,and that increasing steel beam height can significantly improve the structure performance during the transition phase and suspension stage.