【正文】 .......................................................................................... 5 開展研究的意義 ......................................................................................... 5 3 工程概況及其計(jì)算方法 .............................................................................................. 7 工程設(shè)計(jì)概況 .................................................................................................... 7 計(jì)算方法 ........................................................................................................... 7 極限狀態(tài)方程 .................................................................................................... 7 4 設(shè)計(jì)基本資料及構(gòu)造布置 ........................................................................................... 9 設(shè)計(jì)資料 ............................................................................................................ 9 橫截面布置 ...................................................................................................... 11 主梁間距與數(shù)量 .................................................................................... 11 主梁跨中截面尺寸擬定 ......................................................................... 11 橫隔梁設(shè)置 ............................................................................................ 12 橋面鋪裝 ................................................................................................ 12 5 截面幾何特性計(jì)算 .................................................................................................... 13 6 主梁內(nèi)力計(jì)算 ............................................................................................................ 15 永久作用效應(yīng)計(jì)算 .......................................................................................... 15 山東交通 學(xué)院本科生畢業(yè)設(shè)計(jì)（論文 ） 5 恒載內(nèi)力計(jì)算 ........................................................................................ 15 永久作用效應(yīng) ........................................................................................ 16 可變作用效應(yīng)計(jì)算 .......................................................................................... 18 沖擊系數(shù)和車道折減系數(shù) ..................................................................... 18 主梁荷載橫向分布系數(shù) ......................................................................... 18 活載內(nèi)力計(jì)算 ........................................................................................ 21 作用效應(yīng)組合 .................................................................................................. 22 7 預(yù)應(yīng)力鋼束估算及布置 ............................................................................................ 24 預(yù)應(yīng)力鋼束數(shù)量估算 ...................................................................................... 24 預(yù)應(yīng)力鋼束的布置 .......................................................................................... 25 確定鋼束彎起角和線形 ................................................................................... 27 鋼束計(jì)算 .......................................................................................................... 27 計(jì)算鋼束起彎點(diǎn)到跨中的距離 ............................................................. 27 計(jì)算控制截面鋼束重心 ......................................................................... 28 預(yù)應(yīng)力計(jì)算鋼束長(zhǎng)度 ............................................................................. 29 8 鋼束預(yù)應(yīng)力損失計(jì)算 ............................................................................................... 31 ................................................................................................. 31 .......................................................................... 31 預(yù)應(yīng)力鋼束與管道壁間的摩擦引起的預(yù)應(yīng)力損失 ............................... 31 預(yù)應(yīng)力鋼束由錨具變形、鋼筋回縮引起的預(yù)應(yīng)力損失 ....................... 32 混凝土彈性壓縮引起的預(yù)應(yīng)力損失 ...................................................... 33 由預(yù)應(yīng)力剛筋應(yīng)力松弛引起的預(yù)應(yīng)力損失 .......................................... 35 混凝土的收縮和徐變引起的預(yù)應(yīng)力損失 .............................................. 36 預(yù)應(yīng)力損失匯總 .................................................................................... 38 山東交通 學(xué)院本科生畢業(yè)設(shè)計(jì)（論文 ） 6 預(yù)加力作用效應(yīng)計(jì)算 ...................................................................................... 39 9 主梁截面承載力與應(yīng)力驗(yàn)算 ..................................................................................... 42 持久狀況承載能力極限狀態(tài)承載力驗(yàn)算 ........................................................ 42 正截面承載力驗(yàn)算 ................................................................................ 42 斜截面承載力驗(yàn)算 ................................................................................ 44 斜截面抗彎承載力驗(yàn)算 ......................................................................... 47 正常使用極限狀態(tài)抗裂性驗(yàn)算 ....................................................................... 47 正截面抗裂性驗(yàn)算 ................................................................................ 47 斜截面抗裂性驗(yàn)算 ................................................................................ 49 持久狀況應(yīng)力驗(yàn)算 .......................................................................................... 51 跨中截面混凝土法向應(yīng)力驗(yàn)算 ............................................................. 51 預(yù)應(yīng)力鋼筋拉應(yīng)力驗(yàn)算 ......................................................................... 52 斜截面混凝土主壓應(yīng)力驗(yàn)算 ................................................................. 53 短暫狀況構(gòu)件應(yīng)力驗(yàn)算 ................................................................................... 55 10 主梁端部局部承壓驗(yàn)算 .......................................................................................... 58 局部承壓區(qū)截面尺寸驗(yàn)算 ............................................................................. 58 局部抗壓承載驗(yàn)算 ........................................................................................ 59 11 主梁變形驗(yàn)算 .......................................................................................................... 61 預(yù)壓力引起的跨中反拱度 ............................................................................. 61 由荷載引起的跨中撓度 ..............................................