【正文】 三跨預(yù)應(yīng)力連續(xù)梁橋設(shè)計(jì) 摘要 在本設(shè)計(jì)中，根據(jù)地形圖和任務(wù)書(shū)要求，依據(jù)現(xiàn)行公路橋梁設(shè)計(jì)規(guī)范提出了預(yù)應(yīng)力混凝土連續(xù)梁橋、預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋、 梁拱組合體系橋 三種橋型方案。按照“實(shí)用、經(jīng)濟(jì)、安全、美觀”的設(shè)計(jì)原則，經(jīng)過(guò)對(duì)各種橋型的比選，最終選擇 60m+90m+60m 的預(yù)應(yīng)力混凝土連續(xù)梁橋?yàn)楸敬蔚耐扑]設(shè)計(jì)橋型。 本設(shè)計(jì)利用 MIDAS 軟件進(jìn)行結(jié)構(gòu)分析，根據(jù)橋梁的尺寸擬定建立橋梁基本模型，然后進(jìn)行內(nèi)力分析，計(jì)算配筋結(jié)果，進(jìn)行施工各階段分析及截面驗(yàn)算。同時(shí)，必須要考慮混凝土收縮、徐變此內(nèi)力和溫度次內(nèi)力等因素的影響。 最后，經(jīng)過(guò)分析驗(yàn)算表明該設(shè)計(jì)計(jì)算方法正確，內(nèi)力分布合理，符合設(shè)計(jì)任務(wù)要求。 關(guān)鍵字：比選方案；連續(xù)梁橋；連續(xù)剛構(gòu)；拱橋；預(yù)應(yīng)力鋼筋 ；截面驗(yàn)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(yù)應(yīng)力混凝土連續(xù)梁橋概述 ............................................................................ 1 技術(shù)標(biāo)準(zhǔn) ........................................................................................................ 4 地質(zhì)條件 ........................................................................................................ 5 采用材料 ........................................................................................................ 6 采用規(guī)范 ........................................................................................................ 6 2 方案比選 .................................................................................................................. 7 構(gòu)思宗旨 ........................................................................................................ 7 比選標(biāo)準(zhǔn) ........................................................................................................ 7 設(shè)計(jì)方案 ........................................................................................................ 7 設(shè)計(jì)方案一 ........................................................................................... 7 設(shè)計(jì)方案二 ........................................................................................... 8 設(shè)計(jì)方案三 ........................................................................................... 9 方案比選 .......................................................................................................10 方案確定 ....................................................................................................... 11 3 預(yù)應(yīng)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(xì)部尺寸 ......................................................................................16 橋面鋪裝 .............................................................................................18 橋梁下部結(jié)構(gòu) ......................................................................................19 本橋使用材料 ......................................................................................19 全橋結(jié)構(gòu)單元的劃分 .....................................................................................19 劃分單元原則 ......................................................................................19 橋梁具體單元?jiǎng)澐? ...............................................................................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(nèi)力計(jì)算 ..........................................................................................................22 恒載內(nèi)力計(jì)算 ................................................................................................23 恒載內(nèi)力計(jì)算 ......................................................................................23 懸臂澆筑階段內(nèi)力 ...............................................................................23 邊跨合攏階段內(nèi)力 ...............................................................................24 中跨合攏階段內(nèi)力 ...............................................................................25 橋面鋪裝階段內(nèi)力 ...............................................................................26 支座位移引起的內(nèi)力計(jì)算方法及結(jié)果 ...................................................27 活載內(nèi)力計(jì)算 ................................................................................................28 活載因子的計(jì)算 ...................................................................................28 橫向分布系數(shù)的考慮 ............................................................................30 荷載組合 ..........................................................................