【正文】
者屬超靜定結(jié)構(gòu),后者為靜定結(jié)構(gòu)。 分類: 按拱圈 (肋 )結(jié)構(gòu)的材料分:有石拱橋(見石橋)、鋼拱橋、混凝土拱橋、鋼筋混凝土拱橋。 對于簡單系圬工拱橋的矢跨比一般為 1/4~1/8,一般小于 1/10,鋼筋混凝土拱橋矢跨比一般為 1/5~1/8。 由墩、臺承受水平推力的推力拱橋,要求支撐拱的墩臺和地基必須承受拱端的強大推力,因而修建推力拱橋要 求有良好的地基。由于拱是主要承受壓力的結(jié)構(gòu),因而可以充分利用抗拉性能較差、抗壓性能較好的石料,混凝土等來 建造。如在均布荷載 q 的作用下,簡直梁的跨中彎矩為 qL2/8,全梁的彎矩圖呈拋物線形,而拱軸為拋物線形的三鉸拱的任何截面彎矩均為零,拱只受軸向壓力。拱橋的靜力特點是,在豎直何在作用下,拱的兩端不僅有豎直反力,而且還有水平反力。s latest specification of the Ministry of Transportation and Communications program parison and selection and design of the 2nd bridge on the road around the island, Nanjing. This paper mainly elaborates the bridge design and calculation process. The first scheme, determine the use of prestressed concrete simply supported Tbeam bridge span arrangement for the 3 20m, the main beam of variable crosssection of the Tshaped beam, high beam is . And a detailed crosssectional design for selected prestressed concrete simply supported Tbeam bridge, the role of the main beam effect calculations, layout and prestress loss of prestressed steel beam calculation, and the main beam section bearing capacity of prestressed checking main beam deformation check, diaphragm beam calculated carriageway board puting and the end of the main beam local bearing checking. The design of the bridge substructure detailed design, including the pier columns cover the beams, pile foundation and abutments design calculations. Key words: Prestressed concrete TCharpy bridge Substructure 3 目 錄 摘要 ..............................................................1 Abstract.........................................................2 1 緒論 ................... .........................................6 拱橋 ........................................................6 概述 ....................................................6 分類 ....................................................6 發(fā)展 ....................................................7 梁橋 ........................................................8 概述 ...................................................8 分類 ....................................................8 發(fā)展 ....................................................8 2 目背景及設(shè)計資料 ....................................10 項目概況 ..................................................10 設(shè)計基本資料 ............................................10 主要技術(shù)指標 ..........................................10 設(shè)計采用規(guī)范 ..........................................10 、地質(zhì)、地貌 ........................................10 氣象氣候 .............................................. 11 3 方案比選 ...................................................... 12 設(shè)計資料 ..................................................12 4 橋型選擇 .................................................13 方案一拱橋 ...........................................13 方案二懸臂梁橋 ......................................15 ........................................17 方案比選 ..................................................19 4 橋梁結(jié)構(gòu)計算 ................................................20 設(shè)計資料 ..................................................20 基本資料 .............................................. 20 ...............................................20 主要材料 .............................................. 20 .................................................. 21 建模 .......................................................22 設(shè)置操作環(huán)境 ......................................... 22 ........................................22 ...............................................22 ..........................23 建立結(jié)構(gòu)模型 ..........................................23 入 ...............................................24 移動荷載數(shù)據(jù)輸入 .....................................24 運行結(jié)構(gòu)分析 ..........................................25 ............................................. 26 反力 ...................................................26 5 變形 ...................................................26 內(nèi)力 ...................................................27 表格 ...................................................28 復(fù)核 ...................................................33 參考文獻 ........................................................346 第一章緒論 在公路、鐵路、城市和農(nóng)村道路以及水利建設(shè)中 , 為了跨越各種障礙 (如河流、溝谷或其他線路等 ), 必須修建各種類型的橋梁 , 因此橋 梁 是交通線中的重要組成部分 , 而且往往是保證全線通車的關(guān)鍵。 關(guān)鍵詞 : 預(yù)應(yīng)力混凝土 T 型簡支梁橋 下部結(jié)構(gòu) 2 Nanjing road around the island bridge Abstract The design of the bridge named Nanjing road around the island on the 2nd bridge, bridge 60 meters in length, 30 meters wide, Wide bridge, in order to avoid uneven settlement, divided into two, single transverse arrangement for: + m sidewalks roadway +, road class II, sidewalk design load value of universal design specifications of highway bridges and culverts. Beam bottom elevation of ≥ m the midspan beam bottom control elevation. Bridge slope for the twoway cross slope of %。并針對所選的預(yù)應(yīng)力混凝土簡支 T 形梁橋進行了詳盡的截面設(shè)計、主梁作用效應(yīng)計算、預(yù)應(yīng)力鋼束布置及預(yù)應(yīng)力損失計算 , 并進行了主 梁截面承載力與預(yù)應(yīng)力驗算、主梁變形驗算、橫隔梁計算、行車道板的計算以及主梁端部的局部承壓驗算等。 文中主要闡述了該橋的設(shè)計和計算過程。橋位為軟土地基地區(qū),為避免由于路基沉降引起路橋銜接處的錯臺現(xiàn)象發(fā)生,本設(shè)計在橋頭兩側(cè)各設(shè) 二 級 6+8 米搭 板,作為道路和橋梁的過渡。橋梁坡度為雙向橫坡 %;西 側(cè)縱坡%, 東 側(cè)縱坡 %。1 南京市環(huán)島路 2 號橋 設(shè)計 摘 要 本設(shè)計橋名為南京市環(huán)島路 2 號橋 , 橋全長 60 米 , 寬 30 米 ,由于橋?qū)捿^大,為避免不均勻沉降,將其分為兩幅,單幅 橫向布置為: + 行車道 +, 公路 II 級, 人行道 設(shè)計荷載 《公路橋涵通用設(shè)計規(guī)范》 取值 。梁底標高為中跨梁底控制標高≥ 米。 設(shè)計安全等級為二級,橋梁結(jié)構(gòu)設(shè)計基準期為 100 年。 本設(shè)計是根據(jù)交通部現(xiàn)今最新規(guī)范的規(guī)定 對 南京市環(huán)島路 2 號橋 進行方案比選和設(shè)計的。文中首先進行方案比選 , 確定采用預(yù)應(yīng) 力混凝土簡支 T 形梁橋 , 跨徑布置為 3 20m, 主梁為變截面 T 形梁 , 梁高為 。本設(shè)計還對橋梁的下部結(jié)構(gòu)進行了詳細的設(shè)計 , 包 括墩柱蓋梁、樁基礎(chǔ)以及橋臺的設(shè)計計算。 west side of the longitudinal slope of %, the east side of longitudinal slope of %. Design level of security for the two bridge structural design of the base period of 100 years. Bridge bit soft ground areas, to avoid subgrade settlement caused the bridge convergence at the dislocation occurs, the design in the bridge on both sides of each two 6 +8 m ride board, as the transition of roads and bridges. This