【作者】 范圣杰；

【导师】 姜忻良；

【作者基本信息】 天津大学 ， 结构工程， 2009， 硕士

【摘要】 地铁建设是未来解决城市交通拥挤问题的主要方法,已有的震害表明,地铁结构一旦遭受地震破坏,将会给地震应急和震后修复工作带来极大的困难。由于地铁结构完全埋于土中,所以土-结构动力相互作用问题成为地震工程和土木工程领域的前沿课题。由于问题的复杂性,仅仅依靠理论分析难以满足实际工程的需要。因此开展土-结构动力相互作用的试验研究,对深入了解动力相互作用机理,验证理论和计算分析的正确性,推动其工程应用,具有重要的理论和现实意义。本文以天津站交通枢纽振动台试验为依据,利用ANSYS有限元软件对振动台试验进行二维数值模拟,与试验结果相比较,从而验证振动台试验的可靠性和计算分析模型的准确性。本文具体的研究工作如下:(1)对振动台试验的工程背景、模型的设计和制作以及试验现象进行了介绍。(2)对振动台试验数据进行整理分析。分析了模型地基和结构的加速度反应规律;分析了结构在地震动作用下应变分布规律;分析了地土-结构接触面上的动土压力实测结果及其反应的规律。(3)以试验模型为基础,建立考虑土-结构动力相互作用的二维有限元模型。在ANSYS中成功实现了结构与土的接触模拟、粘弹性边界的模拟和重力的引入。(4)对各种试验工况下土-结构相互作用体系的地震反应进行了数值模拟,并与试验结果进行了对比。结果表明:数值模拟与振动台模型试验结果基本一致,体现出了相似的规律性,相互印证了计算分析模型和振动台试验结果的正确性。更多还原

【Abstract】 Building of metro is main method to solve the congestion of city. The previousseismic damages of metro prove that restoration of it is very difficult as soon as it is dammed by earthquake. As far as urban earthquake disaster reduction planning are concerned, study on the earthquake resistant behavior of metro and its seismic design method are regarded more and more by people. For metro structure is embedded in soil, the problems of soil-structure dynamic interaction become a frontal question for discussion in earthquake engineering and civil engineering fields. Because the questions are more complicated, theoretical analysis alone can not meet the actual needs of the project. So it has important theoretical significance and practical meaning to do the tests on soil-structure dynamic interaction system, the results of the test can be used to further study the mechanism of the interaction of soil-structure , validate the theoretical results, impel the theory to be applied in practical engineering.Based on the shaking table test design of Tianjin Station Transportation Hub Project, the seismic analysis of the model with ANSYS was simulated in the paper. The paper will research the following problems:(1) Introduce the background of the shaking table test, the design and production of the modle, and the phenomenon during the test.(2) In this paper the simulative effect of boundary is analyzed. It proves that the effect of boundary on the earthquake responses of structure is avoided effectively.At the same time, the rules of the earthquake responses o fmodel syetem are concluded by analyzing the test results. The strain responses of tunnel are analyzed and the distribution roles of strain in transverse are given. The dynamic in soil pressure in contact surface between soil and model box and between soil and tunnel are also given(3) Based on the test modle, establish two-dimensional finite element model.Implement the viscoelastic boundary, the contact of soil-structure and consider gravity in ANSYS.(4) The simulation results and the shaking table test reconls are compared in detail in this paper. The results show that the simulation results and the laws of seismic are responses of the soil-subway station stuction system are basically idlentical with those of the shaking table test. So that the analysis results andthe shaking table test results are proved to be correct.更多还原