基于JC法的地下结构动力可靠性研究

发布时间：2018-01-11 10:32

本文关键词：基于JC法的地下结构动力可靠性研究　出处：《防灾减灾工程学报》2014年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Based on JC method, the dynamic reliability analysis method of underground structure is proposed, and the finite element analysis model of nonlinear dynamic interaction between soil and subway tunnel is established. The soil-subway tunnel structure system is regarded as a plane strain problem, and the dynamic characteristics of soil and station structure concrete are simulated by Davidenkov dynamic constitutive model and dynamic plastic damage model, respectively. The stress characteristics of subway tunnel structure under ground motion are analyzed and its dynamic reliability is further studied. The reliability and reliability index of tunnel structure are obtained. The results show that the reliability of the tunnel structure is the lowest at the 45 掳position on the upper side of the tunnel structure, and the lowest at the 45 掳position on the right side of the lower part of the tunnel structure. This is consistent with the analysis of tensile stress response of tunnel structure. The dynamic reliability of tunnel structure is the lowest due to the pulse effect of seismic wave when the bedrock inputs the dynamic Northridge wave and Chi-chi wave of near-fault ground earthquake. In general, the tunnel structure is safe and reliable under the action of 0.1 g and 0.2 g ground motion.
【作者单位】：金陵科技学院建筑工程学院;南京工业大学岩土工程研究所;
【基金】：中国博士后基金(2013M540442) 江苏省属高校自然科学研究面上项目(12KJD560002) 金陵科技学院科研基金项目(Jit-n-201202)资助
【分类号】：U452.1
【正文快照】： 引言近年来,国内外学者通过数值模拟、理论分析和模型试验等方法,分别对地铁地下结构的抗震性能进行了相关的研究,取得了很有价值的科研成果[1-4]。在得出地铁地下结构动力反应特性的同时,如何评价地震受损结构的动力可靠性,是当今地铁地下结构研究的新课题。相对于上部结构的

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