本文關鍵詞：開口箱—桁組合結構鐵路斜拉橋橋面系結構的研究　出處：《中南大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 箱-桁組合結構 鐵路斜拉橋 有限元分析 橋面系 結構參數(shù)

【摘要】：摘要：在建荊岳鐵路(荊州—岳陽)洞庭湖大橋是世界上第一座三塔雙主跨鐵路斜拉橋,跨度布置為(98+140+406+406+140+98)m,通行雙線中-活載,主梁采用開口箱-桁組合結構,以提高橋梁的整體剛度和橋面系局部剛度。本文以該橋為背景,采用有限元分析方法,對開口箱-桁組合結構斜拉橋的橋面系結構形式和結構參數(shù)進行了研究,主要工作和成果如下： 1、提出了兩種開口箱-桁組合斜拉橋的橋面結構體系,一種為密布橫梁橋面結構體系,另一種為縱、橫梁橋面結構體系。對兩種橋面結構體系進行參數(shù)化并分別擬定了基本結構,采用空間板梁法分別建立了全橋空間有限元模型,較為系統(tǒng)地研究了橋梁的變形和受力狀態(tài)。結果表明,兩種橋面結構都可匹配出較為合理的結構參數(shù),可應用于開口箱-桁組合結構斜拉橋的正交異性板橋面系。 2、對比研究了兩種橋面結構體系對橋梁整體剛度的影響。結果表明,就橋梁整體剛度而言,密布橫梁橋面系和縱、橫梁橋面系兩種結構基本一致,兩者的基本結構在靜活載作用下的撓跨比分別為1/679和1/685。 3、對比研究了兩種橋面結構體系的局部剛度,包括橋面節(jié)間中心相對變形wc和同一線兩軌三米內(nèi)相對變形量△。結果表明,橋面系結構參數(shù)對wc和△的影響很大,密布橫梁橋面系的局部剛度明顯優(yōu)于縱、橫梁橋面系； 4、對比研究了兩種橋面結構體系橋面荷載的傳力途徑和橋面受力狀態(tài)。結果表明,密布橫梁橋面系的下弦箱應較粗壯,其基本結構的結構構造和結構參數(shù)是合理的；縱、橫梁橋面系的縱、橫梁應在其基本結構上適當增強,而下弦箱略顯粗壯,可適當減弱。 本文的研究成果為洞庭湖三塔雙主跨鐵路斜拉橋的設計提供了依據(jù),對其他類似橋梁也有參考價值。圖36幅,表18個,參考文獻60篇。
[Abstract]:Abstract: the Jingyue Railway (Jingzhou-Yueyang) Dongting Lake Bridge under construction is the first cable-stayed bridge with three towers and two main spans in the world, with a span of 98 140 406 406 140 98 m. In order to improve the overall stiffness of the bridge and the local stiffness of the deck system, the main beam adopts the open box truss composite structure to improve the overall stiffness of the bridge and the local stiffness of the bridge system. This paper takes the bridge as the background and adopts the finite element analysis method. The structure form and structural parameters of deck system of cable-stayed bridge with open box-truss composite structure are studied. The main work and results are as follows: 1. Two kinds of deck structure system of cable-stayed bridge with open box and truss are put forward, one is the bridge deck system with dense beam, the other is longitudinal. The two kinds of bridge deck structure system are parameterized and the basic structures are drawn up respectively. The spatial finite element model of the whole bridge is established by using the spatial slab beam method. The deformation and stress state of the bridge are studied systematically. The results show that the two kinds of bridge deck structure can match the reasonable structural parameters. It can be applied to orthotropic plate bridge system of cable-stayed bridge with open box and truss structure. 2. The effects of two kinds of deck structure on the overall stiffness of the bridge are compared and studied. The results show that the bridge deck system of dense cross beam is basically the same as that of longitudinal and cross beam deck system in terms of the overall stiffness of the bridge. The basic structure of the two structures under the action of static and live load is 1/679 and 1 / 685 respectively. 3. The local stiffness of two kinds of bridge deck structures, including the relative deformation of the center of the bridge deck and the relative deformation within three meters of the two rails of the same line, are compared and studied. The results show that. The structural parameters of bridge deck system have a great influence on WC and the local stiffness of bridge deck system with dense beams is obviously superior to that of longitudinal bridge deck system. 4. The load transfer way and the stress state of the deck of two kinds of bridge deck structure system are compared. The results show that the chord box of the bridge deck system with dense cross beam should be relatively strong. The structure and parameters of its basic structure are reasonable. The longitudinal and transverse beams of the bridge deck system should be strengthened in their basic structure, while the chord box is slightly thicker and can be weakened properly. The research results of this paper provide the basis for the design of the cable-stayed bridge with three towers and two main spans in Dongting Lake, and have reference value for other similar bridges, including 36 figs, 18 tables and 60 refs.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.27;U443.32

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