多线路地下交叉隧道纵向地震反应分析

发布时间：2018-04-08 20:28

本文选题：反应位移法　切入点：隧道抗震　出处：《青岛理工大学》2014年硕士论文

【摘要】：伴随经济持续增长，我国城市化进程越来越快，一线城市的交通问题日益恶化，放眼全世界的超级大都市，无一例外地都把发展城市地下轨道交通作为缓解地面交通压力的重要手段，因此大规模地开发地下空间将成为今后很长一段时期的发展趋势。与此同时，我国也是一个地震多发国家，鉴于历次大地震都给人民生命和财产造成了巨大损失，而地下结构特别是隧道在城市基础设施中占据重要地位，所以对于隧道工程，，必须预先进行严格的地震反应分析，以保证建成以后的使用过程中具有可靠的抗震性能。这方面，日本在地下工程抗震领域长期积累下来的经验值得我们学习和借鉴。基于以上背景，本文主要做了以下工作： ⑴开挖隧道地震反应分析相关理论和方法研究。主要探讨了反应位移法在隧道地震反应分析中的应用，对其中一些关键参数的求解原理作了详细说明，另外也总结了抗震规范中规定的抗震性能要求，概括了隧道抗震设计流程的通用步骤。 ⑵以日本某城市拟建地下交通隧道的结构设计方案为例，基于反应位移法对隧道结构进行建模与地震反应分析，验证隧道抗震性能。隧道结构用梁单元模拟，用土-结构共同作用弹簧模拟土和结构的相互作用，用连接弹簧模拟分段结构箱体之间的钢筋连接，并得到一系列的地震反应结果，主要包括隧道箱体的内力反应和箱体之间连接处的变形反应，并依据相关抗震规范对所研究隧道设计方案的抗震安全性做出判断。 ⑶提出优化设计建议并将其反映到结构模型中再计算直到得出理想反应结果。对隧道设计方案中无法达到可靠抗震性能的部位提出优化设计建议，主要是调整箱体连接使用的钢筋量、增加结构分段数量以及改变结构分段箱体之间的连接方式来降低隧道结构的地震反应。通过本文的研究，主要得到了以下相关有价值的结论：结合反应位移法理论与有限元建模方法的隧道结构动力反应时程分析在隧道抗震性能设计中具有良好的实用性；隧道结构的整体性与抗震性能是相矛盾的；将隧道结构分段，选用合适的连接方式可以有效提高抗震性能。
[Abstract]:With the sustained economic growth, China's urbanization process is getting faster and faster, traffic problems in first-tier cities are worsening day by day, looking at the world's mega-cities.Without exception, the development of urban underground rail transit is regarded as an important means to relieve the pressure of surface traffic. Therefore, the large-scale development of underground space will become the development trend in a long period of time in the future.At the same time, China is also an earthquake-prone country. In view of the enormous loss of life and property caused by all the major earthquakes, underground structures, especially tunnels, play an important role in urban infrastructure, so for tunnel engineering,Strict seismic response analysis must be carried out in advance in order to ensure reliable seismic performance after completion.In this respect, Japan has accumulated long-term experience in the field of earthquake resistance of underground engineering.Based on the above background, the main work of this paper is as follows:1 study on the theory and method of seismic response analysis of excavated tunnel.This paper mainly discusses the application of response displacement method in tunnel seismic response analysis, explains in detail the principle of solving some of the key parameters, and summarizes the seismic performance requirements stipulated in the seismic code.The general steps of tunnel seismic design flow are summarized.(2) taking the structural design scheme of the proposed underground traffic tunnel in a Japanese city as an example, the seismic behavior of the tunnel is verified by modeling and seismic response analysis of the tunnel structure based on the response displacement method.The tunnel structure is simulated by beam element, the interaction between soil and structure is simulated by soil-structure interaction spring, and the connection of steel bar between segmented structure box is simulated by connection spring, and a series of seismic response results are obtained.It mainly includes the internal force response of the tunnel box and the deformation response of the joint between the boxes, and the seismic safety of the tunnel design scheme is judged according to the relevant seismic code.(3) the optimal design suggestion is put forward and reflected in the structure model and then calculated until the ideal reaction result is obtained.The paper puts forward some suggestions for optimal design of the parts of tunnel design that can not achieve reliable seismic performance, mainly by adjusting the amount of steel bar used in connecting the box body.The seismic response of tunnel structure can be reduced by increasing the number of sections and changing the connection between sections.Through the research of this paper, the following valuable conclusions are obtained: the dynamic response time history analysis of tunnel structure based on the theory of response displacement method and finite element modeling method has good practicability in the design of tunnel seismic performance;The integrity of tunnel structure is contradictory to the seismic performance, and the seismic performance can be improved effectively by dividing the tunnel structure into sections and selecting the appropriate connection mode.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.28

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