基于LS-DYNA的结构连续倒塌过程数值模拟

Numerical simulation of structure progressive collapse process using LS-DYNA

结构在突发灾害作用下,通常引起局部构件的直接破坏,并进一步导致整体结构破坏、倒塌。这种倒塌破坏模式称为连续倒塌,其破坏模式十分复杂,具有动力性、非线性、不确定性等特点。本文应用大型动态数值计算模拟软件ANSYS/LS-DYNA,模拟框架结构的倒塌全过程。分析平面框架及空间框架结构在倒塌过程中不同的失效模式,研究不同失效区域下的倒塌的情况及堆积范围、应力最大点等问题的分析。同时,实现结构的载荷传递路径以及内力重分布的可视化,从而可以为实际工程结构的倒塌预防与控制提供一定的理论基础。

The structure is usually confronted with kinds of emergencies,which may cause a local component direct damage and even result in a final collapse of the overall structure. This collapse mode is called progressive collapse,showing significant dynamic property,nonlinearity,and uncertainty. In this paper,the ANSYS / LS-DANA is used to simulate the progressive collapse process of frame structure. Different collapse failure modes of plane and space frame structure are analyzed,so as to investigate the collapse state,debris area and maximum stress point. Further,through the numerical simulation,the load transferring paths and internal force redistribution process can be visualized which will be great help to avoid progressive collapse of the frame structure.