發(fā)布時間：2018-01-03 21:45

  本文關(guān)鍵詞：液化場地橋臺震害模式及地震響應(yīng)研究　出處：《大連交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地震液化 震害模式 數(shù)值模擬 地震響應(yīng)

【摘要】：在大量的橋梁震害中,由橋臺破壞引起的橋梁損壞是其主要震害形式,并且這些破壞常常伴隨著砂土液化引起的地面大變形。橋臺作為連接橋梁、路堤的重要結(jié)構(gòu),是整個橋梁結(jié)構(gòu)中極其重要的組成部分。橋臺破壞不僅造成自身功能的喪失,還可能導(dǎo)致落梁等震害,并最終導(dǎo)致整個橋梁結(jié)構(gòu)損毀。為研究液化場地橋臺的震害模式和地震響應(yīng)規(guī)律,提出合理的抗震設(shè)計方法,本文在查閱大量國內(nèi)外文獻(xiàn)資料的基礎(chǔ)上,針對液化場地橋臺震害模式的研究現(xiàn)狀進(jìn)行了歸納總結(jié),采用有限元軟件UWLC對唐山地震中的勝利橋進(jìn)行有限元數(shù)值模擬分析,研究了液化場地橋臺震害模式的影響因素以及橋臺的地震響應(yīng)規(guī)律。本文的主要內(nèi)容如下： (1)初步總結(jié)了液化場地橋臺的震害特點及影響因素。通過大量震害調(diào)查和資料查閱,對液化場地的橋臺震害特點有了初步認(rèn)識,分析了可能影響液化場地橋臺震害模式的主要因素。包括：梁的水平約束力、液化大變形以及地震特性等因素。 (2)基于UWLC有限元軟件數(shù)值模擬平臺,針對振動臺試驗,建立橋臺滑坡的有限元模型,采用完全耦合的有效應(yīng)力方法進(jìn)行數(shù)值模擬。結(jié)果表明：模擬結(jié)果與試驗結(jié)果較好的吻合,用修正的Paster-Zienkiewicz Mark-Ⅲ模型能很好的模擬砂土在地震荷載作用下的液化特性,間接的證明UWLC軟件的可用性和模型的正確性。 (3)結(jié)合唐山地震勝利橋震害實例,采用數(shù)值分析方法,模擬了勝利橋的震害過程,研究了重力式橋臺的影響因素及地震響應(yīng)規(guī)律。結(jié)果表明：考慮梁的約束作用后,模擬結(jié)果與觀測值基本一致。梁的水平約束力、液化層厚度、臺頂重量、地震加速度峰值以及液化層埋深都對重力式橋臺的震害模式產(chǎn)生影響。研究還表明水泥土法是一種較好的液化治理措施。該成果能較好地反映地震作用下液化場地橋臺的動力響應(yīng),為液化場地橋臺的抗震理論計算提供很好的分析依據(jù)。 (4)建立液化場地樁基橋臺數(shù)值模型,分析了梁的約束力和液化層厚度對樁基橋臺震害模式的影響,并研究樁基橋臺的地震響應(yīng)。結(jié)果表明：梁的水平約束力和液化層厚度對樁基橋臺的震害模式產(chǎn)生一定影響。
[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，

本文編號：1375706