【摘要】 对由地下隧道内发生意外爆炸引起的地下爆炸波作用下基底滑移隔震大跨结构考虑土-结构相互作用(SSI)的动力响应进行了全面的分析。在SSI分析中,分别采用有限元、无穷元和杆件体系建立了地下衬砌及周围有限土区、远场无限土区以及基底滑移隔震大跨结构的计算模型;在基底滑移隔震分析中,提出用连续摩擦力模型取代传统库仑摩擦力模型,以避免跟踪啮合滑移的过渡边界并可减小计算误差。最后,通过与Lysmer透射边界法和修正阻尼透射边界法的算例结果对比分析,验证了本文方法的有效性,其数值结果揭示了地下爆炸波作用下大跨结构的基底滑移隔震效果以及不同隔震参数对隔震效果的影响,从而为城市地下隧道建设相关的理论研究和工程实践提供了重要的依据。更多还原

【Abstract】 In this paper, the dynamic response analysis for the sliding base-isolated long-span structures, subjected to the underground explosion waves caused by accidental explosion inside underground tunnels, is performed considering soil-structure interactions. In the analysis of soil-structure interactions, a coupling calculation model of the tunnel and the finite soil around, the surrounding semi-infinite soil, and the sliding base-isolated long-span structure is established using the finite elements, the infinite elements and the frame system. In the analysis for sliding base isolation, the continuous friction model instead of the traditional Coulomb friction model is proposed in order to avoid the tracing of the transient boundary between meshing and sliding and to reduce the calculated error. Finally, the numerical simulation is carried out to investigate the effect of sliding base isolation for a long-span structure, subjected to the underground explosion waves, and the influence of different isolation parameters on its effect. This provides an important reference to either related academic research or practices in engineering for the construction of underground tunnels in cities.更多还原