【正文】 oncrete 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。 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、鋼絲回縮引起的應(yīng)力損失 .......................... 62 預(yù)應(yīng)力鋼筋分批張拉時混凝土彈性壓縮引起的應(yīng)力損失 .......... 63 鋼筋松弛引起的預(yù)應(yīng)力損失 .................................. 64 持久狀況截面承載能力極限狀態(tài)計算 ................................ 67 正截面承載能力計算 ......................................... 67 斜截面承載力計算 ........................................... 68 應(yīng)力驗算 ........................................................ 69 短暫狀況的正應(yīng)力驗算 ....................................... 69 持久狀況的正應(yīng)力驗算 ....................................... 70 持久狀況下的混凝土主應(yīng)力驗算 ............................... 71 抗裂性驗算 ................................................. 75 主梁變形（撓度）計算 ............................................ 77 荷載短期效應(yīng)組合下主梁撓度驗算 ............................. 77 預(yù)加應(yīng)力引起的上拱度計算 ................................... 78 預(yù)拱度的設(shè)置 ............................................... 78 支座計算 ....................................................... 80 選定支座的平面尺寸 ........................................ 80 確定支座的厚度 ............................................ 81 驗算支座的偏轉(zhuǎn) ............................................ 82 驗算支座的抗滑穩(wěn)定性 ...................................... 82 結(jié) 論 .................................................................. 84 參考文獻(xiàn) ................................................................ 85 致 謝 ......