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由于地震效应、重载车辆的震动效应或由于不同爆炸物引起的强烈冲击效应,都会给城市地下空间结构带来较大的影响。通过土体的混凝土改进剑桥动力本构模型和混凝土塑性损伤本构模型,建立地表爆炸冲压荷载简化计算模型,对城市地下空间结构在TNT当量100 kg的炸药爆炸冲压荷载作用下进行了动力分析,研究了结构埋深、土体刚度对结构动力响应的影响,分析了远场爆炸地震波作用下地下空间结构的动力响应。计算结果表明,地下空间结构中部顶板产生了轻微的拉伸损伤;当埋深小于5 m时,结构动应力响应较大;结构覆盖土刚度越小,土对爆炸能量的吸收作用越显著;由于爆炸产生的地震波频率高,其对结构动应力的影响较小。研究结果对地下结构的抗爆设计具有一定的参考意义。
Due to the earthquake effect, the vibration effect of heavy-duty vehicles or the strong impact caused by different explosives, it will have a greater impact on the urban underground space structure. Through the improvement of the dynamic constitutive model of Cambridge and the plastic damage constitutive model of concrete by the soil concrete, a simplified calculation model of the surface blasting punching load is established. The dynamic analysis of the urban underground space structure under the explosion punching load with TNT equivalent of 100 kg is carried out. The effect of depth of buried structure and stiffness of soil on the dynamic response of the structure is studied, and the dynamic response of the subsurface structure under far-field blasting seismic wave is analyzed. The calculated results show that there is a slight tensile damage to the roof of the central underground structure. When the buried depth is less than 5 m, the dynamic stress response of the structure is larger. The smaller the rigidity of the covering soil, the more significant the absorption of the explosive energy. The frequency of seismic waves generated by the explosion is high, which has little impact on the structural dynamic stress. The research results have certain reference meaning for antiknock design of underground structures.