内爆炸作用下地铁车厢结构动力响应数值分析  

Numerical Investigation on the Dynamic Responses of Subway Carriage Due to Internal Explosion

作　　者：刘扬 白春 李荷香 LIU Yang;BAI Chun;LI Hexiang(School of Civil Engineering,Xuchang University,Xuchang 461000,China)

机构地区：[1]许昌学院土木工程学院,河南许昌461000

出　　处：《许昌学院学报》2024年第5期87-91,共5页Journal of Xuchang University

基　　金：河南省科技攻关项目(242102320031)。

摘　　要：基于Euler-Lagrangian耦合的方法,利用LS-DYNA非线性有限元程序,考虑了车厢结构对爆炸流场的影响,构建了全尺寸地铁车厢仿真模型.对比研究了空旷隧道内爆炸和地铁车厢内爆炸两种工况下爆炸冲击波传播特性,分析了炸药当量对地铁结构动力响应的影响.结果表明:有车厢内爆炸载荷与无车厢下的爆炸载荷有较大区别,爆炸波在车厢内会发生反射和叠加,使得有车厢时的超压峰值远远小于无车厢中的峰值,波形也更加复杂;炸药当量越大车厢对地铁结构压力峰值的影响越弱.Utilizing the Euler-Lagrangian coupling method and the LS-DYNA nonlinear finite element program,a full-scale simulation model of a subway carriage was developed,taking into account the impact of the carriage structure on the explosion flow field.A comparative study was conducted on the propagation characteristics of explosion shock waves in two scenarios:in an empty tunnel and within a subway carriage.The impact of explosive charge weight on the dynamic response of the subway structure was also analyzed.The results show that there are significant differences between the explosion loads inside and outside the carriage.Inside the carriage,the explosion wave experiences reflection and superposition,leading to substantially lower overpressure peaks compared to those in the absence of the carriage,and the waveforms are more complex.Additionally,as the explosive charge weight increases,the influence of the carriage on the peak pressure of the subway structure weakens.

关 键 词：地铁隧道 内爆炸 数值模拟 传播规律 

分 类 号：O382[理学—流体力学]