爆炸荷载作用下钢框架结构的连续性倒塌分析

Analysis of Progressive Collapse of Steel Frames under Blast Loading

利用ANSYS/LS-DYNA有限元程序研究爆炸荷载作用下钢框架结构的连续性倒塌机理,主要针对三层两跨钢框架结构进行分析,总结多层钢框架结构在不同工况条件下的倒塌规律。利用相关规范提出的拉结构件法对结构进行加强设计,验证了多层钢框架结构在多柱破坏情况下拉结构件法的有效性。多柱破坏时,可以通过合理拉结设计有效避免结构发生连续性倒塌,为实际工程中如何利用拉结构件法进行加强设计提供了理论参考。

The mechanism of progressive collapse of steel frames under blast loading was performed by using AN- SYS/LS-DYNA finite element analysis software. By considering three layer two span steel frames as subject, the mechanism of progressive collapse of multi-story steel frames in which many columns were destroyed were ana- lyzed. And the regularities of progressive collapse of multi-story steel frames under different working conditions were summarized. The structure can be strengthened by using the tying intension method and the effectiveness in conditions of some columns destroyed is proved. When some columns are destroyed, the progressive collapse of multi-story steel frames can be prevented through the suitable tying intension method, which provides a theory reference for the practical engineering.