液化场地桥台震害模式及地震响应研究
发布时间：2018-01-03 21:45
本文关键词：液化场地桥台震害模式及地震响应研究 出处：《大连交通大学》2014年硕士论文 论文类型：学位论文
【摘要】：在大量的桥梁震害中,由桥台破坏引起的桥梁损坏是其主要震害形式,并且这些破坏常常伴随着砂土液化引起的地面大变形。桥台作为连接桥梁、路堤的重要结构,是整个桥梁结构中极其重要的组成部分。桥台破坏不仅造成自身功能的丧失,还可能导致落梁等震害,并最终导致整个桥梁结构损毁。为研究液化场地桥台的震害模式和地震响应规律,提出合理的抗震设计方法,本文在查阅大量国内外文献资料的基础上,针对液化场地桥台震害模式的研究现状进行了归纳总结,采用有限元软件UWLC对唐山地震中的胜利桥进行有限元数值模拟分析,研究了液化场地桥台震害模式的影响因素以及桥台的地震响应规律。本文的主要内容如下： (1)初步总结了液化场地桥台的震害特点及影响因素。通过大量震害调查和资料查阅,对液化场地的桥台震害特点有了初步认识,分析了可能影响液化场地桥台震害模式的主要因素。包括：梁的水平约束力、液化大变形以及地震特性等因素。 (2)基于UWLC有限元软件数值模拟平台,针对振动台试验,建立桥台滑坡的有限元模型,采用完全耦合的有效应力方法进行数值模拟。结果表明：模拟结果与试验结果较好的吻合,用修正的Paster-Zienkiewicz Mark-Ⅲ模型能很好的模拟砂土在地震荷载作用下的液化特性,间接的证明UWLC软件的可用性和模型的正确性。 (3)结合唐山地震胜利桥震害实例,采用数值分析方法,模拟了胜利桥的震害过程,研究了重力式桥台的影响因素及地震响应规律。结果表明：考虑梁的约束作用后,模拟结果与观测值基本一致。梁的水平约束力、液化层厚度、台顶重量、地震加速度峰值以及液化层埋深都对重力式桥台的震害模式产生影响。研究还表明水泥土法是一种较好的液化治理措施。该成果能较好地反映地震作用下液化场地桥台的动力响应,为液化场地桥台的抗震理论计算提供很好的分析依据。 (4)建立液化场地桩基桥台数值模型,分析了梁的约束力和液化层厚度对桩基桥台震害模式的影响,并研究桩基桥台的地震响应。结果表明：梁的水平约束力和液化层厚度对桩基桥台的震害模式产生一定影响。
[Abstract]:In a large number of bridge damage, bridge damage caused by bridge abutment damage is the main form of earthquake damage, and these damage is often accompanied by the large deformation of the ground caused by liquefaction of sand. The bridge abutment is used as a connecting bridge. The important structure of embankment is an extremely important part of the whole bridge structure. The failure of abutment not only causes the loss of its own function, but also may lead to the earthquake damage such as falling beam. Finally, the whole bridge structure is damaged. In order to study the seismic damage mode and seismic response law of the bridge abutment in liquefaction site, a reasonable seismic design method is put forward in this paper, on the basis of consulting a large number of domestic and foreign literature. In this paper, the research status of seismic damage mode of bridge abutment in liquefaction site is summarized and finite element software UWLC is used to simulate and analyze Shengli Bridge in Tangshan earthquake. In this paper, the influence factors of seismic damage mode of bridge abutment in liquefaction site and the seismic response law of bridge abutment are studied. The main contents of this paper are as follows: 1) the earthquake damage characteristics and influencing factors of liquefaction site abutment are preliminarily summarized. Through a large number of seismic damage investigation and reference of data, the characteristics of bridge abutment damage in liquefaction site are preliminarily understood. The main factors that may affect the seismic damage mode of bridge abutment in liquefaction site are analyzed, including the horizontal binding force of beam, the large deformation of liquefaction and the seismic characteristics. Based on the UWLC finite element software, the finite element model of bridge abutment landslide is established for shaking table test. A fully coupled effective stress method is used for numerical simulation. The results show that the simulation results are in good agreement with the experimental results. The modified Paster-Zienkiewicz Mark- 鈪，
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