“9·11”世贸大楼坍塌原因数值分析

The numerical analysis on collapse of WTC

数值分析表明 ,“9·11”恐怖袭击事件造成纽约世贸大楼的内部竖向承重钢结构的防火保护层在爆炸中严重脱落 ,火灾高温使钢材强度大幅度降低 ,导致着火层群柱失稳 ,上部巨大的冲击荷载把下层柱逐层压 ,引发连续坍塌。最后对超高层建筑的结构设计提出建议。

The numerical analysis indicates that the fire protecting claddings of inner vertical load-bearing steel structure spall off seriously in explosion and the strength of steel reduces in high temperature of the fire, leading to failure of columns in the floor on fire. The upper huge falling loads crush the lower columns one by one, causing incremental collapse. Finally some suggestions on structure design of super high-rise buildings are given.