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基于JC法提出了地下结构的动力可靠性分析方法,建立地基土-地铁隧道非线性动力相互作用的有限元分析模型,将地基土-地铁隧道结构体系视为平面应变问题,采用Davidenkov动力本构模型和动塑性损伤模型,分别模拟土体和车站结构混凝土的动力特性,分析在地震动作用下地铁隧道结构的应力特性,进一步研究其动力可靠性,得到隧道结构的可靠度和可靠指标,以此评价地铁隧道结构的可靠性。结果表明:隧道结构上部右侧45°位置处的可靠性最低,下部右侧45°位置处的可靠性较低,这与隧道结构的拉应力反应的分析结果一致;基岩输入近断层地震动Northridge波和Chi-chi波时,由于地震波的脉冲效应,隧道结构的动力可靠性最低;总体而言,在0.1 g和0.2 g地震动作用下,隧道结构的可靠性足够,结构安全可靠。
Based on the JC method, a dynamic reliability analysis method for underground structures is proposed and a finite element analysis model of nonlinear dynamic interaction between foundation soil and subway tunnel is set up. Taking the foundation soil-subway tunnel structural system as a plane strain problem, a Davidenkov dynamic constitutive model Model and plastic-plastic damage model, respectively, to simulate the dynamic characteristics of soil and station structure concrete, analyze the stress characteristics of subway tunnel structure under earthquake action, further study its dynamic reliability, obtain the reliability and reliability index of tunnel structure This evaluation of the reliability of subway tunnel structure. The results show that the reliability of the upper part of the tunnel structure at 45 ° to the right is lower and the reliability at the lower 45 ° to the right is lower, which is consistent with the analysis of the tensile stress response of the tunnel structure. The bedrock input near-fault ground motions Northridge wave and Chi-chi wave, the dynamic reliability of the tunnel structure is the lowest because of the pulse effect of seismic wave. Generally speaking, the reliability of the tunnel structure is sufficient and the structure is safe and reliable under 0.1 g and 0.2 g earthquakes.