發(fā)布時間：2018-06-06 06:25

  本文選題：懸索橋 + 重力式錨碇　； 參考：《重慶交通大學》2015年碩士論文

【摘要】：懸索橋外觀造型優(yōu)美,跨越能力大,在1000m以上的大跨徑橋梁中是其他任何橋型無法超越的。在國民經濟高速發(fā)展的今天,對交通運輸量的要求也越來越高,而我國大江大河眾多,海岸線也很長,懸索橋勢必會成為日后大跨度橋型中的主要方案。錨碇作為懸索橋最重要的承重構件之一,它的主要作用就是將主纜的巨大拉力傳遞給地基。重力式錨碇則是依靠混凝土的自重來抵消主纜拉力的豎向方向分力,主纜的水平方向分力則是由基巖與混凝土基礎間的摩擦以及基礎前側土體的抗力來抵抗。本文主要圍繞重慶寸灘長江大橋重力式錨碇結構而展開,先對懸索橋錨碇結構的結構組成、受力特點等方面做了簡單的概述,也總結了現(xiàn)在一些國內學者在重力式錨碇結構方面的相關研究;結合現(xiàn)行錨碇設計的原則,對錨碇結構的穩(wěn)定性理論、結構分析計算原理(常規(guī)解析方法與有限元法)及溫度應力對大體積混凝土的影響做了系統(tǒng)介紹;結合已建懸索橋的錨碇結構形式,對寸灘長江大橋的錨碇的構造特點進行了簡單總結;運用穩(wěn)定性理論,分析了寸灘長江大橋南錨碇和北錨碇的地基承載力、整體抗滑移和抗傾覆穩(wěn)定性以及對錨塊的斜截面抗剪進行了驗算,還分析探索了北錨碇砂質泥巖上基巖摩阻力和地基承載力試驗的相關方法和步驟,并得到了相應的試驗結果;運用有限元軟件Midas/FEA建立實體有限元模型,探討了預應力前錨式、后錨式兩種錨固系統(tǒng)作用下錨碇結構各組成部分的應力分布情況,并對兩種錨固方式下關鍵部位的應力分布進行了比較分析;最后,對散索鞍支墩傾斜角度的不同對支墩底部應力的改善做了簡單分析。論文成果對同類型錨碇結構的優(yōu)化具有一定參考價值。
[Abstract]:The suspension bridge has a beautiful appearance and large span ability, which can not be surpassed by any other bridge type in the long span bridge over 1000m. With the rapid development of the national economy, the demand for traffic and transportation volume is becoming higher and higher, and there are many big rivers and long coastline in our country, so the suspension bridge is bound to become the main scheme of the long-span bridge in the future. Anchorage is one of the most important load-bearing components of suspension bridge. Its main function is to transfer the great tension of the main cable to the foundation. The gravity Anchorage relies on the weight of concrete to offset the vertical force of the main cable, and the horizontal force of the main cable is resisted by the friction between the bedrock and the concrete foundation and the resistance of the soil in front of the foundation. This paper mainly focuses on the gravity Anchorage structure of Cuntan Yangtze River Bridge in Chongqing. First of all, the structure composition and mechanical characteristics of the suspension bridge Anchorage structure are briefly summarized. Also summarized some domestic scholars in the gravity Anchorage structure related research, combined with the current principles of Anchorage design, the stability of Anchorage structure theory, The principle of structural analysis and calculation (conventional analytical method and finite element method) and the effect of temperature stress on mass concrete are introduced systematically, and the Anchorage structure of the suspension bridge is also introduced. The structural characteristics of Anchorage of Putan Yangtze River Bridge are summarized, and the foundation bearing capacity of south Anchorage and North Anchorage of Cuntan Yangtze River Bridge is analyzed by using stability theory. The whole anti-slip and anti-overturning stability and the shear resistance of the inclined section of the anchor block are checked and calculated. The relevant methods and steps for the test of the friction resistance of the bedrock and the bearing capacity of the foundation on the sand mudstone of the North Anchorage are analyzed and explored, and the corresponding test results are obtained. The finite element model is established by using the finite element software Midas/FEA, and the stress distribution of each part of the Anchorage structure under the action of two kinds of anchoring systems, namely the pre-stressed anchor type and the post-anchor type, is discussed. The stress distribution of the key parts under two kinds of anchoring modes is compared and analyzed. Finally, the improvement of the stress at the bottom of the pier is simply analyzed by the different inclined angles of the saddle support pier. The results of this paper have certain reference value for the optimization of the same type of Anchorage structure.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U448.25

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本文編號：1985564