等效线性方法在地铁车站抗震分析中的应用

发布时间：2018-05-23 22:51

本文选题：等效线性模型 + 地铁车站抗震　；参考：《地下空间与工程学报》2015年S2期

【摘要】：地铁车站等地下结构的抗震设计离不开场地的地震分析,而一维等效线性化波动方法是土层地震反应分析的主流方法。该方法可以间接模拟土体的动力非线性,并能满足工程需要的精度要求。本文探讨了等效线性方法的有限元实现方法,并嵌入到ABAQUS的用户子程序UMAT数据接口。算例表明,此方法的一维场地地震分析与SHAKE91相吻合,符合实际规律并具有较高的计算精度和较快收敛速度。考虑土与结构相互作用,将等效线性方法应用于地铁车站的横断面抗震分析中,发现结构受力形式和滑移破坏与实际的震害观测资料吻合,与反应位移法的对比发现二者计算的内力分布差异较大,当按照传统拟静力方法抗震设计时,顶板的受力和设计应该引起足够的重视。此方法具有自身的优势,可以作为一种辅助手段运用于地铁车站等地下结构的抗震分析中。
[Abstract]:Seismic design of underground structures such as subway stations is inseparable from site seismic analysis, and one-dimensional equivalent linearization wave method is the mainstream method of soil seismic response analysis. This method can indirectly simulate the dynamic nonlinearity of soil and meet the requirement of engineering precision. In this paper, the finite element method of equivalent linear method is discussed and embedded into the user subprogram UMAT data interface of ABAQUS. The numerical examples show that the one-dimensional seismic analysis of the site is consistent with the SHAKE91 method, which accords with the actual law and has higher accuracy and faster convergence rate. Considering the interaction between soil and structure, the equivalent linear method is applied to the seismic analysis of the cross section of subway station. It is found that the stress form and slip failure of the structure are in agreement with the observed data of the actual earthquake damage. Comparing with the response displacement method, it is found that the internal force distribution of the two methods is quite different, and the stress and design of the roof should be paid more attention to when the seismic design is based on the traditional pseudostatic method. This method has its own advantages and can be used as an auxiliary means in seismic analysis of underground structures such as subway stations.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家重点基础研究发展计划973项目(2011CB710602) 国家自然科学基金(51139004,51479191) 国家自然科学青年基金(41202227)
【分类号】：TU352.11;TU93

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