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

【摘要】：重力式U型橋臺因其取材方便且施工簡單等優(yōu)點在橋梁工程中備受青睞,現行的U型橋臺標準圖的高度在8米以下,寬度在12米之內,難以滿足實際設計需要。通過對已有與在建橋臺的調查表明,填土高度大于8米或寬度大于15米的橋臺多有開裂現象,橋臺整體性被破壞。本文通過有限元分析模擬實驗以及現場工程測試,對不同高度、不同寬度、不同工況下的高填方重力式U型橋臺臺身應變-應力規(guī)律進行研究,尋求高填方重力式U型橋臺的受力特點,提出有利于高填方橋臺預防或緩解開裂病害及使得結構受力更為穩(wěn)定的設計方法。取得如下研究成果：(1)分析了不同高度下臺身應力-應變分布規(guī)律及其隨高度增加的變化。將離心模型試驗與有限元分析模擬的結果相互驗證,臺身豎向壓應力呈上小下大的分布規(guī)律,且隨高度增加,壓應力整體增大。臺身橫向應力呈上拉下壓的分布規(guī)律,側墻自由端頂部為拉應力集中區(qū)域。(2)分析了不同寬高比下臺身應力一應變分布規(guī)律,高窄橋臺臺內填土體積較小,填土重量較難維持橋臺穩(wěn)定；寬大橋臺內大量填土對側、前墻產生了較大的水平壓力,造成墻身變形。將離心模型試驗與有限元分析結果對比,得出高填方橋臺易破壞位置：側前墻隅角處向側墻中部的裂縫、前墻自由端墻踵處輕微碎裂以及基底的下沉現象。(3)分析了不同工況下臺身應力-應變分布規(guī)律。重力式橋臺的前墻作為主要承重結構承受豎向壓力,在設計施工過程中需注意臺身偏心受壓發(fā)生傾覆。特別是在橋臺形態(tài)高窄時,需保證臺內填土有足夠的質量,以維持臺身平衡。(4)根據數值模擬計算結果初步研究了高橋臺的穩(wěn)定性驗算方法和施工工藝與質量控制方法。
[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.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441;U445.559

【參考文獻】

相關期刊論文 前1條

1 張鐵軍;;山區(qū)橋梁結構設計關鍵問題研究[J];交通標準化;2009年13期

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本文編號：1838877