马场坪收费站汽车爆炸破坏的数值模拟分析

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (21) : 184-189.

论文

马场坪收费站汽车爆炸破坏的数值模拟分析

高轩能，刘颖，杨维英

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Numerical Simulation for the Damage of Ma Chang Ping Highway Toll Station under Lorry-blasting

GAO Xuan-neng, LIU Ying, YANG Wei-ying

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摘要

应用LS-DYNA有限元程序建立马场坪收费站在汽车爆炸作用下的数值计算模型，对空间网架结构在爆炸作用下的冲击波超压、破坏过程和破坏模式进行了数值模拟计算。提取网架结构内表面有限测点的爆炸冲击波超压并将其进行本征正交分解（POD），得到冲击波压力场的显性表达和主本征模态。对模拟计算结果与收费站实际破坏情况进行比较分析，揭示了空间网架结构的爆炸破坏机理和原因。数值结果表明，LS-DYNA非线性有限元模型与POD法的结合，能够准确地模拟空间网架结构在爆炸作用下的破坏过程和模式，充分泄爆可以防止空间网架结构在爆炸作用下的破坏倒塌，避免人员损伤。提出在空间网架结构的抗爆和防爆设计中，应采取“强结构弱围护”的设计原则。

Abstract

A numerical simulation model for Ma Chang Ping highway toll station under lorry-blasting was established by employing fluid-structure coupling algorithm LS-DYNA. The shock wave overpressure, failure process and failure mode of the spatial truss structure subjected to explosion were numerically simulated. And to get the explicit expression of the shock wave pressure field and the principal eigenmodes, the blast overpressure data of the finite points at internal surface of the spatial truss structure were extracted and were decomposed by proper orthogonal decomposition (POD) method. Through the comparative analysis of the simulation results and actual destruction of the toll station, the failure mechanism and causes of the explosive damage for the spatial truss structure were revealed. The numerical results showed that LS-DYNA nonlinear finite element model combined with the POD method are capable of accurately simulating the destruction process and damage model of the spatial truss structure under blast, and that adequate venting could prevent collapse of the spatial truss structure from explosion and could avoid injury to persons. The design principle of strong structure weak envelope is proposed for blast-resistant and explosion-proof of the spatial truss structure.

导出引用

高轩能;刘颖;杨维英. 马场坪收费站汽车爆炸破坏的数值模拟分析[J]. 振动与冲击, 2012, 31(21): 184-189

GAO Xuan-neng;LIU Ying;YANG Wei-ying. Numerical Simulation for the Damage of Ma Chang Ping Highway Toll Station under Lorry-blasting[J]. Journal of Vibration and Shock, 2012, 31(21): 184-189