地下爆炸波作用下基底滑移隔震建筑-土-隧道相互作用的动力分析

采用子结构耦合法对由隧道及其周围的有限土体、远场半无限土体以及上部基底滑移隔震建筑等三部分构成的体系在隧道内发生意外爆炸时的弹塑性动力响应进行了数值分析;在基底滑移隔震分析中,提出了修正的连续摩擦力模型以取代传统的库仑摩擦力模型,避免了计算过程中跟踪啮合滑移的过渡边界从而可降低计算误差。通过与 Lysmer 透射边界法和修正阻尼透射边界法的数值结果对比分析,验证了本文方法的有效性,其数值结果揭示了在遭受地下爆炸波作用并考虑土-结构相互作用的基底滑移隔震建筑动力响应的内在规律,从而为深入的理论研究与工程实践提供了重要的依据。

DYNAMIC INTERACTION ANALYSIS OF SLIDING BASE-ISOLATED BUILDING-SOIL-TUNNEL SUBJECTED TO UNDERGROUND EXPLOSION WAVE

In this paper, dynamic elastic-plastic responses of the interaction system consisting of a tunnel and the around finite soil, the far-field semi-infinite soil and a sliding base-isolated building subjected to an accidental explosion inside the tunnel are numerically analyzed using the coupling method of substructures. In the analysis of sliding base isolation, a modified continuous friction model is proposed to replace the conventional Coulomb friction model, which can avoid tracing the transient boundary between meshing and sliding and reduce the calculating error. The proposed method is verified through the comparison of numerical results using the coupling method with those using the Lysmer viscosity boundary method or the Modified viscosity boundary method. The numerical results offer the insight of the dynamic responses of sliding base-isolated buildings subjected to the underground explosion waves in consideration of the soil-structure interaction. The present work may serve as an important reference for further theoretical research and engineering practice.