地下结构横截面抗震设计方法对比研究

发布时间：2018-04-14 11:15

本文选题：地下结构 + 抗震设计方法　；参考：《中国地震局工程力学研究所》2014年硕士论文

【摘要】：地下空间在现代社会中被广泛利用，已成为城市中不可缺少的一部分。特别是地下轨道交通的迅速发展，大大改善了特大城市和超大城市地面交通拥堵的窘境。地下结构建设周期长、造价高、施工难度大，并且破坏后所造成的直接和间接经济损失都比一般的地面结构要大得多。然而，地下结构的振动特性与地面结构相比存在很大的差异，照搬地面结构的抗震设计方法进行地下结构抗震设计并不可取。在历史多次地震中，均出现了隧道、地铁车站、地下排水管等地下结构的破坏。地下结构一旦破损，其修复工作也是相当困难的。本文在总结前人工作的基础上，通过数值模拟和理论分析，对比研究了各种地下结构抗震设计方法的优劣性，同时对反应位移法的计算参数进行了灵敏度分析并对该方法进行了改进，，具体内容如下： 1.研究现状本文从解析法、数值模拟和简化分析方法三个方面介绍了地下结构抗震设计方法的研究现状。 2.地下结构抗震设计方法本文详细介绍了5种地下结构抗震设计方法（地震系数法、自由场变形法、土-结相互作用系数法、反应位移法、有限元拟静力法）的计算形式、优缺点及其工程适用性。 3.地下结构设计方法对比分析本文在第二章的基础上，对这5种计算方法在地下结构处于不同土体剪切模量、不同埋深和复杂土层三种情况进行了对比计算，并将其计算结果与动力有限差分软件Flac2D的计算结果进行对比，对其计算结果进行分析，进一步评判各种方法的优缺点。 4.反应位移法计算参数的灵敏度分析本文对反应位移法中4种计算参数（弹簧系数、土层位移、土层剪力、惯性力）进行了灵敏度分析，得出了各个计算参数对地下结构内力的影响大小，同时对常用的两种计算模型进行了对比研究。 5.反应位移法改进本文从改进反应位移法计算参数着手，分别对弹簧系数、土层剪力以及惯性力的求解方法进行改进，并对其计算结果进行调整。研究结果表明改进的反应位移法优于传统的反应位移法，且适用性良好。
[Abstract]:Underground space is widely used in modern society, has become an indispensable part of the city.Especially the rapid development of underground rail transit has greatly improved the ground traffic congestion in megacities and megacities.The construction period of underground structure is long, the cost is high, the construction is difficult, and the direct and indirect economic loss caused by the destruction is much larger than that of the ordinary ground structure.However, the vibration characteristics of underground structure are quite different from those of ground structure, so it is not advisable to carry out seismic design of underground structure by copying the seismic design method of ground structure.In many earthquakes in history, underground structures such as tunnels, subway stations, underground drainage pipes and so on have been destroyed.Once the underground structure is damaged, its repair work is also quite difficult.On the basis of summing up the previous work, this paper compares and studies the merits and demerits of various seismic design methods for underground structures through numerical simulation and theoretical analysis.At the same time, the sensitivity of the calculation parameters of the reaction displacement method is analyzed and the method is improved. The content of the method is as follows:1.Research statusThis paper introduces the research status of seismic design methods for underground structures from three aspects: analytical method, numerical simulation method and simplified analysis method.2.Seismic Design method for Underground structuresThis paper introduces in detail five seismic design methods for underground structures (seismic coefficient method, free field deformation method, soil-junction interaction coefficient method, response displacement method, finite element pseudo-static method), their advantages and disadvantages and their engineering applicability.3.Comparison and Analysis of Underground structure Design methodsOn the basis of the second chapter, this paper makes a comparative calculation of the five calculation methods in three cases of underground structure in different soil shear modulus, different buried depth and complex soil layer.The calculation results are compared with those of the dynamic finite difference software Flac2D, and the results are analyzed, and the advantages and disadvantages of various methods are further evaluated.4.Sensitivity Analysis of parameters calculated by reactive displacement methodIn this paper, the sensitivity analysis of four calculation parameters (spring coefficient, soil displacement, soil shear force, inertia force) in the reactive displacement method is carried out, and the influence of each calculation parameter on the internal force of underground structure is obtained.At the same time, two kinds of calculation models are compared and studied.5.Improvement of reaction displacement methodIn this paper, we improve the calculation method of spring coefficient, soil shear force and inertia force, and adjust the calculation results.The results show that the improved reactive displacement method is superior to the traditional reactive displacement method, and its applicability is good.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU93;TU352.12

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