本文選題：高填方 + 重力式U型橋臺(tái)�。� 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：重力式U型橋臺(tái)因其取材方便且施工簡(jiǎn)單等優(yōu)點(diǎn)在橋梁工程中備受青睞,現(xiàn)行的U型橋臺(tái)標(biāo)準(zhǔn)圖的高度在8米以下,寬度在12米之內(nèi),難以滿足實(shí)際設(shè)計(jì)需要。通過(guò)對(duì)已有與在建橋臺(tái)的調(diào)查表明,填土高度大于8米或?qū)挾却笥?5米的橋臺(tái)多有開(kāi)裂現(xiàn)象,橋臺(tái)整體性被破壞。本文通過(guò)有限元分析模擬實(shí)驗(yàn)以及現(xiàn)場(chǎng)工程測(cè)試,對(duì)不同高度、不同寬度、不同工況下的高填方重力式U型橋臺(tái)臺(tái)身應(yīng)變-應(yīng)力規(guī)律進(jìn)行研究,尋求高填方重力式U型橋臺(tái)的受力特點(diǎn),提出有利于高填方橋臺(tái)預(yù)防或緩解開(kāi)裂病害及使得結(jié)構(gòu)受力更為穩(wěn)定的設(shè)計(jì)方法。取得如下研究成果：(1)分析了不同高度下臺(tái)身應(yīng)力-應(yīng)變分布規(guī)律及其隨高度增加的變化。將離心模型試驗(yàn)與有限元分析模擬的結(jié)果相互驗(yàn)證,臺(tái)身豎向壓應(yīng)力呈上小下大的分布規(guī)律,且隨高度增加,壓應(yīng)力整體增大。臺(tái)身橫向應(yīng)力呈上拉下壓的分布規(guī)律,側(cè)墻自由端頂部為拉應(yīng)力集中區(qū)域。(2)分析了不同寬高比下臺(tái)身應(yīng)力一應(yīng)變分布規(guī)律,高窄橋臺(tái)臺(tái)內(nèi)填土體積較小,填土重量較難維持橋臺(tái)穩(wěn)定；寬大橋臺(tái)內(nèi)大量填土對(duì)側(cè)、前墻產(chǎn)生了較大的水平壓力,造成墻身變形。將離心模型試驗(yàn)與有限元分析結(jié)果對(duì)比,得出高填方橋臺(tái)易破壞位置：側(cè)前墻隅角處向側(cè)墻中部的裂縫、前墻自由端墻踵處輕微碎裂以及基底的下沉現(xiàn)象。(3)分析了不同工況下臺(tái)身應(yīng)力-應(yīng)變分布規(guī)律。重力式橋臺(tái)的前墻作為主要承重結(jié)構(gòu)承受豎向壓力,在設(shè)計(jì)施工過(guò)程中需注意臺(tái)身偏心受壓發(fā)生傾覆。特別是在橋臺(tái)形態(tài)高窄時(shí),需保證臺(tái)內(nèi)填土有足夠的質(zhì)量,以維持臺(tái)身平衡。(4)根據(jù)數(shù)值模擬計(jì)算結(jié)果初步研究了高橋臺(tái)的穩(wěn)定性驗(yàn)算方法和施工工藝與質(zhì)量控制方法。
[Abstract]:Gravity U-abutment is very popular in bridge engineering because of its advantages of convenient material selection and simple construction. The current U-abutment standard chart is below 8 meters in height and less than 12 meters in width, so it is difficult to meet the actual design needs. Through the investigation of existing abutments and abutments under construction, it is found that most abutments with filling height greater than 8m or width larger than 15m have cracking phenomenon, and the integrity of abutments is destroyed. Through finite element analysis simulation experiment and field engineering test, the strain-stress law of high fill gravity U-abutment with different height, width and working condition is studied in this paper. The stress characteristics of high fill gravity U type abutment are sought and the design method is put forward which is helpful to prevent or alleviate cracking disease of high fill abutment and to make structure force more stable. The following research results are obtained: (1) the stress-strain distribution and its variation with the height increase are analyzed. The results of centrifuge model test and finite element analysis show that the vertical compressive stress of the abutment is larger than that of the upper one, and with the increase of height, the compressive stress increases as a whole. The lateral stress of the abutment is distributed under upward pull-down compression, and the top of the free end of the side wall is the tensile stress concentration area. (2) the stress-strain distribution of the abutment with different width-height ratio is analyzed. The volume of the fill in the high narrow abutment is relatively small. The fill weight is difficult to maintain the stability of abutment, and a large amount of fill in the opposite side of the bridge abutment produces a large horizontal pressure on the front wall, resulting in the deformation of the wall body. By comparing the results of centrifuge model test and finite element analysis, it is found that the breakage position of high fill abutment is the crack in the corner of the front wall toward the middle of the side wall. The stress-strain distribution of the free end wall heel of front wall and the subsidence of the base are analyzed. The front wall of gravity abutment, as the main bearing structure, is subjected to vertical pressure. During the design and construction, the eccentric pressure of abutment should be overturned. Especially when the abutment shape is high and narrow, it is necessary to ensure that the fill in the abutment has enough quality to maintain the balance of abutment. (4) based on the results of numerical simulation, the stability checking method, construction technology and quality control method of high bridge abutment are preliminarily studied.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U445.559

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本文編號(hào)：1838877