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随着我国城市化水平的不断提高,地铁的建设得到了大力发展。地铁车站的安全防护问题成为国内外关注的热点。本文应用LS-DYNA程序建立了北京比较典型的二层地铁车站有限元模型,通过数值模拟方法分析当此车站站台上发生内部爆炸时,车站内部的爆炸波超压曲线以及地铁车站中柱的动力响应,得出如下结论:1)随着炸药离地面高度的降低,由地面的反射波引起的第二次峰值越来越大;2)车站中柱与楼板之间的节点是抗爆的薄弱部位,在进行地铁车站抗爆设计应充分考虑;3)炸药位置和炸药量的变化对中柱上的有效应力、速度、加速度有一定影响。上述结论将为地铁车站的抗爆设计提供参考。
With the continuous improvement of urbanization in our country, the construction of the subway has been greatly developed. The subway station security protection has become a hot spot at home and abroad. In this paper, LS-DYNA program is used to establish the typical two-story subway station in Beijing. The numerical simulation method is used to analyze the explosion wave overpressure curve at the station and the power of the center pillar of the subway station when an internal explosion occurs on the station platform. In response, the following conclusions can be drawn: 1) The second peak due to reflected waves on the ground is increasing with the decrease of explosive height from the ground; 2) The node between the center pillar and the floor of the station is weak against explosion Site, antiknock design should be fully considered in the subway station; 3) The change of explosives position and explosive charge will have an impact on the effective stress, velocity and acceleration on the center pillar. The above conclusion will provide a reference for antiknock design of metro stations.