【正文】 nternal force, we calculate the lateral direction coefficient of the load with the method of corrected eccentricity the result of the calculation, we can obtain the control internal force, and we can approximately decide the number of the prestressed concrete the main beams with posttensioning method, selecting preburry corrected tube anchoring. Then calculate the loss of the prestress and obtain the valid prestress and examine the strength, stress, and transform of the main beam designing:To make sure that all main beams rear the load together and to enhance the globality of the construction, this design goes on the crossing beam calculation with the method of corrected eccentricity pressures. We only calculate the internal force of the middle crossing beam because of the maximum force is in the place of the middle of the span. Driveway plank designing:In this design, the force diagram of the driveway plank is single direction plank. Key words: Tbeam； prestress； concrete bridge. 大學畢業(yè)設計 III 目 錄 摘 要 .............................................................................................................................. I ABSTRACT .................................................................................................................II 第 1 章 縱橫截面布置 .............................................................................................. 1 設計目的 ............................................................................................................ 1 基本資料 ............................................................................................................ 1 主梁間距與主梁片數(shù) ........................................................................................ 2 主梁跨中界面尺寸擬定 .................................................................................... 4 橫截面沿跨長的變化 ........................................................................................ 5 橫隔梁的設置 .................................................................................................... 5 第 2 章 主梁計算 ...................................................................................................... 6 恒載內力計算 .................................................................................................... 6 恒載集度 ..................................................................................................... 6 恒載內力 ..................................................................................................... 7 活載內力計算（修正剛性橫梁法） ................................................................ 7 沖擊系數(shù)和車道折減系數(shù) ......................................................................... 7 計算主梁的荷載橫向分部系數(shù) ................................................................. 8 車道荷載的取值 ....................................................................................... 12 主梁內力組合 .................................................................................................. 15 預應力鋼束的估算及其布置 .......................................................................... 15 跨中截面鋼束的估算和確定 ................................................................... 15 預應力鋼束布置 ....................................................................................... 17 計算主梁截面幾何特性 .................................................................................. 22 凈截面幾何特 性計算 ............................................................................... 22 換算截面幾何特性計算 ........................................................................... 22 有效分布寬度內截面幾何特性計算 ....................................................... 23 各階段截面對形心軸的靜矩 計算 ........................................................... 24 鋼束預應力損失計算 ...................................................................................... 26 預應力鋼束與管道壁之間的摩擦損失 ................................................... 27 由錨具變形，鋼束回縮引起的損失 ....................................................... 28 混凝土彈性壓縮引起的損失 ................................................................... 30 由鋼束應力松弛引起的損失 ................................................................... 31 混凝土收縮和徐變引起的損失 ............................................................... 31 預加內力計算即鋼束預應力損失匯總 ................................................... 34 主梁截面承載力與應力驗算 .......................................................................... 36 持久狀況承載能力極限狀態(tài)承載力驗算 ............................................... 37 持久狀況構件的應力驗算 ....................................................................... 41 短暫狀況構件的應力驗算 ....................................................................... 49 主梁端部的局部承壓驗算 .............................................................................. 50 主梁變形驗算 ................................................................................................... 54 計算由預加應力引起的跨中反拱度 ..................................................... 54 大學畢業(yè)設計 IV 計算由荷載引起的跨中撓度 ................................................................... 56 結構剛度驗算 ........................................................................................... 57 預拱度的設置 ........................................................................................... 57 第 3 章 橫隔梁計算 ................................................................................................ 58 確定作用在跨中橫隔梁的可變作用 .............................................................. 58 跨中橫隔梁的作用效應影響線 ...................................................................... 58 繪制彎矩影響線 ....................................................................................... 59 繪制剪力影響線 ..................................................................................... 61 截面作用效應計算 .......................................................................................... 62 截面配筋計算 ......................................................