爆炸荷载作用下空间钢框架破坏过程分析

采用有限元软件ANSYS／LS-DYNA研究空间钢框架在爆炸荷载作用下，从开始发生变形直至倒塌的全过程。分析中考虑了爆炸载荷作用时间和荷载峰值对结构动力响应的影响。结果表明：在爆炸荷载作用下，结构变形形态具有局部性和弱传递性，即爆炸区的梁柱首先产生大变形并伴随大塑性应变，最后在横梁和立柱端部达到材料失效应变而断裂，其他部位受到的影响则很小；爆炸部位处的构件断裂破坏后，剩余的结构会在自重和恒载作用下发生连续倒塌。

Fracture Analysis of Steel Frame-structure under Explosion Load

Fracture of steel frame-structure under explosion load is investigated in this paper with dynamic finite element software ANSYS/LS-DYNA. During simulation the affect of explosion action time and maximal explosion pressure are thought about. The result indicate that distortion of structure is part and response pass slowly. Beams and columns happen big distortion in explosion area, and the beam ends are broken. With the increase of explosion action time and maximal explosion pressure, distortion of structure is greater. At last ,destroy model is got under gravity.