地下人防空间板柱结构顶板受力性能研究

摘要

本文通过有限元软件Midas Gen对采用板柱结构的城市道路和大型广场中地下空间结构顶板,建立了平时工况、站时工况两个有限元模型.并对模型的受力、变形性能进行了分析及对比,得出在战时工况时,结构跨中位置的弯矩和挠度增幅大于其他位置.由平时工况转为战时工况后,在顶板有集中荷载范围内,弯矩和挠度会出现较大增长,为今后的地下人防工程结构设计提供参考.%Two models of both the usual conditions and wartime conditions with Midas Gen are established for the roof of such space as the underground large square and space under city road, whose spatial structure is now in the form of slab column structure. The stress and deformation properties of the models are analyzed and compared in detail. The result shows that in wartime conditions, the bending moment and the deflection in the mid-span position increases more than those in other positions. When the conditions are turned from the usual one to the wartime, and within a concentrated load in the roof, the bending moment and deflection will grow larger, which provides reference for structural design of underground civil air defense engineering in the future.