【正文】 h, 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.目 錄摘 要 ..............................................................................................................................IABSTRACT ................................................................................................................II第 1 章 縱橫截面布置 ...............................................................................................1 設(shè)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(shè)置 .....................................................................................................5第 2 章 主梁計算 .......................................................................................................6 恒載內(nèi)力計算 .....................................................................................................6 恒載集度 .....................................................................................................6 恒載內(nèi)力 .....................................................................................................7 活載內(nèi)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(nèi)力組合 ...................................................................................................15 預(yù)應(yīng)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(yù)應(yīng)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(nèi)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(yù)應(yīng)力損失計算 .......................................................................................26 預(yù)應(yīng)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(yīng)力松弛引起的損失 ...................................................................31 混凝土收縮和徐變引起的損失 ...............................................................31 預(yù)加內(nèi)力計算即鋼束預(yù)應(yīng)力損失匯總 ...................................................34 主梁截面承載力與應(yīng)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(gòu)件的應(yīng)力驗算 .......................................................................41 短暫狀況構(gòu)件的應(yīng)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(yù)加應(yīng)力引起的跨中反拱度 .....................................................54 計算由荷載引起的跨中撓度 ...................................................................56 結(jié)構(gòu)剛度驗算 ...........................................................................................57 預(yù)拱度的設(shè)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(yīng)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(yīng)計算 ...........................................................................................62 截面配筋計算 ...................................................................................................63第 4 章 行車道板計算 .............................................................................................65 懸臂板荷載效應(yīng)計算 .......................................................................................65 荷載效應(yīng)組合 ...................................................................................................67 截面設(shè)計、配筋與承載力驗算 .......................................................................68結(jié)束語 .........................................................................................................................70參考文獻 ..................