地下结构的非线性地震响应分析

发布时间：2018-06-26 06:56

本文选题：地铁隧道 + 地铁车站　；参考：《天津大学》2014年硕士论文

【摘要】：地铁地下结构的地震响应研究,对于地下结构抗震设计理论和实践的发展具有重要意义。本文利用土-结构动力相互作用分析程序FLUSH,建立深厚覆盖场地中地铁单隧道地震响应分析问题的模型。其中土体非线性采用等效线性化方法模拟,衬砌考虑混凝土的线性。通过与ANSYS动力时程法比较,验证本文整体模型的精度。在单隧道模型的基础上,以天津市深厚覆盖场地中小间距双隧道为例,分别利用FLUSH程序进行线性与非线性分析,研究近距离双隧道的应力响应相比单隧道的放大作用;再分别以天津市深厚覆盖场地中的单、双层地铁车站为例,考虑弹性基岩,利用反应位移法,建立地铁车站横断面地震反应线性与非线性分析模型,并通过与动力时程法结果的对比,总结反应位移法的计算规律,比较反应位移法和动力时程法的差别。研究表明,近距离双隧道衬砌的应力响应,在线性分析时可比单隧道放大49.1%,非线性分析时可比单隧道放大45.3%。由反应位移法计算深厚覆盖场地中的单、双层地铁车站时,地下结构的地震反应小于动力时程法的分析结果。其中,单层车站的计算误差可达到33.4%;双层车站的线性计算误差可达26.7%,非线性计算误差可达39.8%。
[Abstract]:The study of seismic response of underground structures is of great significance to the development of seismic design theory and practice of underground structures. By using the soil-structure dynamic interaction analysis program FLUSHH, a model for seismic response analysis of a single subway tunnel in a deep covering site is established in this paper. The nonlinear soil mass is simulated by equivalent linearization method, and the linings consider the linearity of concrete. The accuracy of the whole model is verified by comparing with ANSYS dynamic time process method. Based on the model of single tunnel, taking Tianjin double tunnel with middle and small spacing in deep overlay site as an example, the linear and nonlinear analysis is carried out by using flash program to study the magnification of stress response of short distance double tunnel compared with that of single tunnel. Taking the single and double layer subway stations in Tianjin as an example, considering elastic bedrock, the linear and nonlinear analysis models of seismic response at cross section of subway stations are established by using the response displacement method. By comparing with the results of dynamic time process method, the calculation law of response displacement method is summarized, and the difference between response displacement method and dynamic time process method is compared. The results show that the stress response of the double tunnel lining in close distance is larger than that in the single tunnel in linear analysis and 45.3 in nonlinear analysis. The seismic response of underground structures is less than that of the dynamic time-history method when the single and double subway stations in the deep covering site are calculated by the response displacement method. Among them, the calculation error of single-layer station can reach 33.4, the linear error of double-layer station can reach 26.7, and the error of nonlinear calculation can reach 39.8.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU93

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