【正文】 黃淮學(xué) 院本科畢業(yè)設(shè)計 1 摘 要 預(yù)應(yīng)力混凝土簡支 T 形梁橋由于其具有外形簡單，制造方便，結(jié)構(gòu)受力合理，主梁高跨比小，橫向借助橫隔梁聯(lián)結(jié)，結(jié)構(gòu)整體性好，橋梁下部結(jié)構(gòu)尺寸小和橋型美觀等優(yōu)點，目前在公路橋梁工程中應(yīng)用非常廣泛。 本次畢業(yè)設(shè)計為 一級 公路橋 設(shè)計，主梁就選用了后張法預(yù)應(yīng)力混凝土簡支 T形梁。首先進行了橋型方案的比選，確定簡支梁橋方案后，就其進行了結(jié)構(gòu)設(shè)計，設(shè)計的主要內(nèi)容有：擬定截面尺寸；計算控制截面的設(shè)計內(nèi)力及其相應(yīng)的組合值；估算預(yù)應(yīng)力鋼筋的數(shù)量并對其進行布置；計算主梁截面的幾何特征值；計算預(yù)應(yīng)力損失值；正截面和斜截面的承載力 復(fù)核；正常使用極限狀態(tài)下構(gòu)件抗裂性及變形驗算；持久狀態(tài)下和短暫狀態(tài)下構(gòu)件截面應(yīng)力驗算。接著進行了簡單的施工方法設(shè)計，包括施工前的準(zhǔn)備，主要分項工程的施工方法設(shè)計，冬季和雨季的施工安排以及施工過程中的環(huán)境保護措施等。 關(guān)鍵詞： 預(yù)應(yīng)力； T 形梁；方案比選；結(jié)構(gòu)設(shè)計；施工方法 黃淮學(xué) 院本科畢業(yè)設(shè)計 2 Abstract Prestressed concrete Tshaped girder bridges are of many advantages. They have simple outlines and can be fabricated easily. The forces that act on their structures are ratio of height of girders to span of girders is small. In landscape orientation the girders are connected by intersecting girders. Therefore the whole structure is of good entirety. And there are still many other merits, such as small size of infrastructure, the beauty of this type of bridge and so on. Because of these advantages the PC Tshaped girder bridges are now widely applied in highway bridge projects. The paper is about the design of first class highway. Posttensioning prestressed concrete Tshaped girder is chosen as the main girder of the bridge. In the process of the design of the bridge, the parison of different types of bridge is done firstly. After the firmation of the type of the bridge, the design of the structure is done, including confirming the size of cross sections, calculating the design forces of restraining sections and bining them according to The Criterion, estimating the amount of prestressed steels and arranging them, calculating the geometrical traits of cross sections of girders, calculating the loss of prestress, checking the carrying capacity of cross sections, check putations of the anticrack capacity of the structure and deformation in the ultimate state of normal use, and the stress of cross section respectively in the state of lasting load and in the state of temporary load. After all the work, next is the design of construction method. It includes the preparation before construction, the design of construction method of small projects, the arrangements of construction in the rainy season and in winter, the measurements of protecting environment in the process of construction. Keywords: prestress。 Tshaped girder。 parion of different schemes。 the design of the structure。 construction method 黃淮學(xué) 院本科畢業(yè)設(shè)計 3 目 錄 摘 要 .................................................................... 1 Abstract ................................................................ 2 1 引橋計算 ............................................................... 5 設(shè)計資料 ......................................................... 5 .................................................... 5 主梁跨徑及全長 .............................................. 5 設(shè)計荷載 .................................................... 5 材料 ........................................................ 5 計算方法 .................................................... 5 結(jié)構(gòu)尺寸 .................................................... 5 設(shè)計依據(jù) .................................................... 6 主梁的計算 ....................................................... 6 跨中荷載彎矩橫向分布系數(shù) .................................... 6 橫梁抗彎及抗扭慣矩： ........................................ 7 計算抗彎參數(shù) ? 和扭彎參數(shù) ? ： ................................ 9 計算 荷載彎矩橫向分布系數(shù)影響坐標(biāo) ............................ 9 作用效應(yīng)計算 .................................................... 12 永久作用效應(yīng) ............................................... 12 永久作用效應(yīng)計算 ........................................... 15 可變作用效應(yīng) ............................................... 17 可變荷載剪力效應(yīng)計算 ....................................... 19 持久狀況承載能力極限狀態(tài)下截面設(shè)計、配筋與驗算 .................. 23 配置主筋 ................................................... 23 計算主鋼筋數(shù)量 ............................................. 23 腹筋配置 ................................................... 25 箍筋配置 ................................................... 28 斜截面抗剪承載能力驗算 ..................................... 29 持久狀況正常使用極限狀態(tài)下裂縫寬度驗算 .......................... 31 持久狀況正常使用極限狀態(tài)下的撓度驗算 ............................ 32 2 主橋計算 .............................................................. 36 設(shè)計資料 ........................................................ 36 橋面凈空 ................................................... 36 主梁跨徑及全長 ............................................. 36 設(shè)計荷載 ................................................... 36 材料 ....................................................... 36 施工工藝 ................................................... 36 設(shè)計依據(jù) ................................................... 36 橫截面布置 ...................................................... 36 主梁間距與主梁片數(shù) ......................................... 36 主梁跨中截面主要尺寸 ....................................... 37 橫截面沿跨長變化 ........................................... 40 黃淮學(xué) 院本科畢業(yè)設(shè)計 4 橫隔梁的設(shè)置 ............................................... 40 主梁作用效應(yīng)計算 ................................................ 41 永久作用效應(yīng)計算 ........................................... 41 可變作用效應(yīng)計算 ........................................... 43 主梁作用效應(yīng)組合 ........................................... 51 預(yù)應(yīng)力鋼束的估算及其布置 ........................................ 52 跨中截面鋼束的估算和確定 ................................... 52 預(yù)應(yīng)力鋼束的布置 ........................................... 53 計算主梁截面幾何特性 ............................................ 59 截面面積及慣性矩計算 ....................................... 59 截面凈矩計算 ............................................... 60 截面幾何特性匯總 ........................................... 60 鋼束預(yù)應(yīng)力損失計算 .............................................. 61 2.. 預(yù)應(yīng)力鋼筋與管道摩擦引起的預(yù)應(yīng)力損失 ...................... 61 錨具變形、鋼絲回