T型交叉换乘车站地震反应和损伤分析

发布时间：2018-11-01 11:53

【摘要】：随着我国地铁建设的快速发展,换乘地铁车站的应用越来越重要,其中以交叉节点换乘车站最为方便快捷。与通道换乘相比,换乘时可以节省大量的步行时间。这种方便的换乘形式需要复杂的交叉地下结构来支持。所以,对交叉换乘车站的地震响应和损伤分析的研究具有重要的现实意义和工程应用价值。本文以T型交叉换乘地铁车站结构为研究背景,考虑土-结构相互作用,基于通用有限元软件ABAQUS,建立数值分析模型,并考虑粘弹性人工边界,输入水平作用的地震动,研究结构的地震响应和损伤发展趋势。车站结构采用混凝土损伤塑性模型,利用损伤因子来描述混凝土在循环荷载下的非线性与疲劳性,考虑了地震前的初始应力场和结构的阻尼效应,并用自编的自动施加粘弹性边界单元的程序对模型施加粘弹性单元,以等.效应力的形式输入地震动,对土-交叉车站结构相互作用系统地进行了地震过程的非线性数值模拟。将EL Centro波、Kobe波两种波形的地震波和均匀、非均匀两种不同的地层相结合,分四种情况对交叉车站结构在地震作用下的损伤发展趋势进行了详细的对比和分析,得出了该种结构可能发生的损伤过程;分析了车站交叉处的独立三层结构和两层标准段结构的地震响应特性,并与相互作用时的地震响应特定进行了对比,结果表明两种情况下的地震响应具有很大的差别,需要在考虑相互作用的基础上进行地铁结构设计。
[Abstract]:With the rapid development of subway construction in our country, the application of transfer subway station is becoming more and more important, among which the crossing node transfer station is the most convenient and fast. Compared with the passage transfer, the transfer can save a lot of walking time. This convenient form of transfer requires complex cross-over structures to support it. Therefore, the study of seismic response and damage analysis of interchange stations has important practical significance and engineering application value. In this paper, a numerical analysis model based on the general finite element software ABAQUS, is established with the T-type cross-transfer subway station structure as the research background, considering the soil-structure interaction, and considering the viscoelastic artificial boundary and the input horizontal ground motion. The development trend of seismic response and damage of structures is studied. The concrete damage plastic model is used to describe the nonlinear and fatigue behavior of concrete under cyclic load. The initial stress field before the earthquake and the damping effect of the structure are considered. The viscoelastic element is applied to the model by the program of automatic application of viscoelastic boundary element. The nonlinear numerical simulation of the soil-crossing station structure interaction is carried out in the form of the effect force input ground motion. Combining the seismic waves of EL Centro wave and Kobe wave with uniform and non-uniform layers, the damage development trend of cross station structure under earthquake action is compared and analyzed in detail in four cases. The possible damage process of this kind of structure is obtained. The seismic response characteristics of the independent three-story structure and the two-story standard section structure at the intersection of the station are analyzed and compared with the specific seismic response under the interaction. The results show that the seismic response of the two cases is very different. The subway structure design needs to be carried out on the basis of considering the interaction.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U231.4;TU93

【参考文献】