薄壳结构内气体爆炸破坏后果数值模拟研究

为研究气体爆炸对结构的破坏效应,依据分析得出的事故数据,计算高压气体主要参数得出高压气团模型,采用AUTODYN,设置合理的流出边界及联接强度,建立Shell/Euler耦合模型,模拟了二甲苯气体爆炸效应。结果较好地描述了结构内爆炸演化过程,二甲苯爆炸导致箱式梁产生一定程度的结构破坏,箱式梁顶板与侧板的焊接点部分断裂,底板与侧板联接失效。仿真结果与事故特征基本吻合,验证了所用模拟方法的有效性。提出的高压气团模拟法基于气体性质,分析爆炸事故特征,确定爆源气体种类并定量其体积及分布。分析仿真结果发现内部加强筋可强化箱式梁。该研究进一步确定二甲苯的燃爆危险性,为二甲苯使用场所提供安全依据及设计参考。

Simulation Analysis of Destructive Effect for Gas Explosion Happened in Thin-shell Construction

 In order to study gas explosion destructive effect, we established an equivalent model according to the analyzed accident key characteristics. With mainly parameters calculated, high pressure gas method was established. Then, by using Shell/Euler coupling algorithm of AUTODYN, a numerical simulation of methane destructive effect was performed. According to the simulation data for one dimethylbenzene explosion accident, dimethylbenzene explosion caused a certain degree of structural damage to the box-type beam. Welding points joint the roof and side of the beam were partially ruptured whilst welding points joint the side and floor were completely broken. High-pressure product rushed out of the floor. Simulation results agreed well with accident destruction features. As analyzed, this simulation method was verified. Evidently, simulation calculation process directly described explosion dynamic evolution process. Besides, high pressure gas method reliably considered gas properties, and could accurately works out gas type, content and filling position. Obtained from details of destruction, inner ribs strengthened the box-type beam shell. As this research further determined the explosion risk of dimethylbenzene, it possible promotes norm-setting for places involving dimethylbenzene, and provides references for similar safety design