【正文】 三跨預應力連續(xù)梁橋設計 摘要 在本設計中，根據地形圖和任務書要求，依據現(xiàn)行公路橋梁設計規(guī)范提出了預應力混凝土連續(xù)梁橋、預應力混凝土連續(xù)剛構橋、 梁拱組合體系橋 三種橋型方案。按照“實用、經濟、安全、美觀”的設計原則，經過對各種橋型的比選，最終選擇 60m+90m+60m 的預應力混凝土連續(xù)梁橋為本次的推薦設計橋型。 本設計利用 MIDAS 軟件進行結構分析，根據橋梁的尺寸擬定建立橋梁基本模型，然后進行內力分析，計算配筋結果，進行施工各階段分析及截面驗算。同時，必須要考慮混凝土收縮、徐變此內力和溫度次內力等因素的影響。 最后，經過分析驗算表明該設計計算方法正確，內力分布合理，符合設計任務要求。 關鍵字：比選方案；連續(xù)梁橋；連續(xù)剛構；拱橋；預應力鋼筋 ；截面驗算 The design of the three span prestressed continuousgirder bridge ABSTRACT In this design, according to the topography ,and project requirements, according to the current highway bridge design specification of prestressed concrete continuous girder bridge forward, prestressed concrete continuous rigidframe structure, girder and arch bridge. According to the “practical, beautiful, safe, economic and convenient” for construction of bridge design principle, structure after the bridge of various final choice of 60m+90m+60m prestressed concrete continuous girder bridge design for this remendation. This design using the MIDSA software analysis the structure, according to the size of bridge, the basic model establishment bridge worked, then force analysis, calculation results of reinforced, for each phase analysis and construction. At the same time, must consider the concrete shrinkage, creep force times and temperature resultant times factors. Finally, after analysis shows that design calculation method of calculation the internal distribution, reasonable, ply with the design requirements of the task. KEY WORDS： selection scheme； continuous girder bridge； continuous rigidframe structure； arch bridge； prestressing steel； checking putation 目錄 1 概述 ......................................................................................................................... 1 預應力混凝土連續(xù)梁橋概述 ............................................................................ 1 技術標準 ........................................................................................................ 4 地質條件 ........................................................................................................ 5 采用材料 ........................................................................................................ 6 采用規(guī)范 ........................................................................................................ 6 2 方案比選 .................................................................................................................. 7 構思宗旨 ........................................................................................................ 7 比選標準 ........................................................................................................ 7 設計方案 ........................................................................................................ 7 設計方案一 ........................................................................................... 7 設計方案二 ........................................................................................... 8 設計方案三 ........................................................................................... 9 方案比選 .......................................................................................................10 方案確定 ....................................................................................................... 11 3 預應力混凝土連續(xù)梁橋總體布置 ..............................................................................12 橋型布置 .......................................................................................................12 孔徑布置 .............................................................................................12 橋梁截面形式 ......................................................................................13 橋梁細部尺寸 ......................................................................................16 橋面鋪裝 .............................................................................................18 橋梁下部結構 ......................................................................................19 本橋使用材料 ......................................................................................19 全橋結構單元的劃分 .....................................................................................19 劃分單元原則 ......................................................................................19 橋梁具體單元劃分 ...............................................................................20 全橋施工節(jié)段劃分 .........................................................................................20 橋梁劃分施工分段原 則 ........................................................................20 施工分段劃分 ......................................................................................21 4 主梁內力計算 ..........................................................................................................22 恒載內力計算 ................................................................................................23 恒載內力計算 ......................................................................................23 懸臂澆筑階段內力 ...............................................................................23 邊跨合攏階段內力 ...............................................................................24 中跨合攏階段內力 ...............................................................................25 橋面鋪裝階段內力 ...............................................................................26 支座位移引起的內力計算方法及結果 ...................................................27 活載內力計算 ................................................................................................28 活載因子的計算 ...................................................................................28 橫向分布系數的考慮 ............................................................................30 荷載組合 ..........................................................................