防爆墙结构是海洋平台的重要防护设施,其抗爆性能需要重点关注.基于非线性有限元方法,研究在常温条件下防爆墙受到爆炸冲击的结构响应.结合实验数据,对比准静态与动态算法的适用性,分析总结在常温条件下结构冲击应变的3种典型形式.在此基础上,考虑高温对材料和结构的影响,并对防爆墙冲击动力响应特性进行分析.研究表明,高温环境对结构响应有明显加剧效应:在选取工况的荷载水平下,高温时结构动力响应的位移幅值应变可达到常温时的5倍;在常温荷载冲击下,结构应变为弹性无应变或小应变,而在高温影响下,其可能加剧为大应变,且高温影响将改变结构的响应形式.研究成果可以为防爆墙的结构设计提供参考.

The blast wall is an important protection facility for offshore platforms, whose anti-explosion performance needs to be focused on. Based on the nonlinear finite element method, the structural dynamic response of the blast wall under the explosion at normal temperature was studied. The applicability of the quasi-static and dynamic algorithms was compared with the experimental data, and the structural impact deformation forms at room temperature were analyzed. Considering the effects of high temperature on materials and structures, the structural dynamic response characteristics of the blast wall were analyzed. The study shows that the high temperature has a significant aggravating effect on structural response. That is, given the load level, the maximum displacement can reach 5 times of that at normal temperature. Under the impact of normal temperature load, the structural strain is elastic with no permanent deformation or with small deformation, but it may aggravate to huge permanent deformation at a high temperature. The effect of high temperature will change the response pattern of the structure. This research can provide reference for the design of blast wall.