空间网架结构的连续倒塌分析

在偶然荷载作用下,结构的局部构件可能发生初始破坏从而导致结构的连续性倒塌。文章基于有限元软件LSDYNA,采用变换荷载路径法对空间网架结构破坏后的倒塌进行了力学分析和仿真,并且分析讨论了结构的关键构件。模拟结果表明增大关键构件的截面及提高材料的失效应变,可显著提高空间网架结构的抗连续倒塌能力,将有可能避免结构倒塌。

The Progressive Collapse Analysis of Space Grid Structures

Initial failure of local elements caused by accidental loads may lead to progressive collapse. Based on the finite element software LS-DYNA,mechanical analysis and simulation for the collapse of space grid structures is processed in this paper with an alternate load path method （AP method）. And the key elements of the structure are discussed. The simulation results show that the progressive collapse resistance capacity of space grid structure can significantly improved by increasing the cross-section of key elements and enhancing the material failure strain. And then, it will be possible to avoid structural collapse.