發(fā)布時間：2018-03-04 04:25

  本文選題：超高墩　切入點：組合式橋墩　出處：《重慶交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著西部交通事業(yè)的蓬勃發(fā)展,公路網絡覆蓋面愈來愈大。預應力混凝土連續(xù)剛構橋以其跨越能力大、整體性能好、受力合理、施工方便等優(yōu)點,成為西部山區(qū)高速公路主要的結構形式。受到山區(qū)特殊地形的限制,需要采用高墩甚至超高墩來跨越峽谷和河流。對于橋墩高度超過百米的連續(xù)剛構橋,不同的橋墩結構形式對橋梁結構的受力和費用有很大影響。本文以貴州省天橋特大橋為工程背景,研究了連續(xù)剛構橋組合式橋墩合理構造形式。主要開展以下研究工作:①總結國內外連續(xù)剛構橋橋墩常用構造形式,介紹了高墩穩(wěn)定分析中常用的平衡法、能量法及有限元法。②針對由獨墩和雙薄壁墩組合而成的組合式橋墩,利用能量法原理中的瑞利-里茲法推導了面內、面外穩(wěn)定屈曲計算公式,并與有限元計算結果比較,驗證文中推導計算公式的準確性。③以組合式橋墩為研究對象,研究組合式橋墩中雙薄壁墩和獨墩分界點位置,得出了組合式橋墩分界點位置與橋墩高度關系不大,與橋墩的截面特性關系較大,改變組合式橋墩上部雙薄壁墩及下部獨墩的截面特性可以顯著的影響橋墩合理分界點位置。利用本文推導的組合式橋墩面內、面外屈曲計算公式,提出了組合式橋墩分界點位置的計算方法,通過圖解法可以較為方便的計算出組合式橋墩的合理分界點位置。④分析了影響超高墩穩(wěn)定性能的幾種主要因素,包括橋墩高墩、截面形式、橋墩垂直度及橋墩截面溫度梯度對穩(wěn)定性的影響。分析表明,穩(wěn)定性能隨著橋墩高度的增加急劇下降,橋墩截面的面內、面外抗彎剛度會對相應面內、外的穩(wěn)定性產生較大的影響;橋墩的垂直度及溫度梯度亦會降低橋墩的穩(wěn)定性能。
[Abstract]:With the rapid development of traffic in western China, the coverage of highway network is becoming larger and larger. The prestressed concrete continuous rigid frame bridge has the advantages of large span capacity, good overall performance, reasonable force, convenient construction, etc. It has become the main structural form of highway in the western mountainous area. Restricted by the special terrain of mountain area, it is necessary to use high pier or even super pier to cross canyon and river. For continuous rigid frame bridge whose pier height is more than 100 meters, Different types of pier structure have great influence on the force and cost of bridge structure. This paper takes the oversize bridge of Guizhou Province as the engineering background. This paper studies the rational structure form of continuous rigid frame bridge composite pier, mainly carries out the following research work: 1 summarizes the common structural forms of continuous rigid frame bridge pier at home and abroad, and introduces the balance method commonly used in the stability analysis of high pier. The energy method and the finite element method .2 are used to deduce the in-plane and out-of-plane buckling formulas for the composite pier composed of the single pier and the double thin-walled pier, and the results are compared with the results of the finite element method, using the Rayleigh-Ritz method in the principle of the energy method. To verify the accuracy of the formula derived in this paper, taking the combined pier as the research object, the location of the boundary point between the double thin-walled pier and the single pier in the composite pier is studied, and the conclusion is drawn that the location of the separation point of the combined pier has little relationship with the height of the pier. Changing the cross-section characteristics of the upper double thin-walled pier and the lower single pier of the combined pier can significantly affect the location of the reasonable boundary point of the pier. The formula for calculating the buckling of the composite pier in and out of the deck is derived in this paper. This paper puts forward a method to calculate the location of the dividing point of the combined pier. It is convenient to calculate the reasonable location of the dividing point of the composite pier by using the graphic method, and several main factors affecting the stability of the super high pier are analyzed, including the high pier of the bridge pier. The analysis shows that the stability performance decreases sharply with the increase of pier height, and the in-plane and out-of-plane flexural stiffness of the pier section will be affected by the in-plane bending stiffness of the pier section. The stability of the piers will be reduced by the vertical degree and temperature gradient of the piers.
【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】：U448.23

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本文編號：1564129