【正文】 .............................................................................. 12 橋面鋪裝 ........................................................................................................ 12 橋梁橫斷面圖 ................................................................................................ 12 主梁毖截面幾何特性計(jì)算 ............................................................................... 13 計(jì)算截面幾何特性 ........................................................................................ 13 檢驗(yàn)截 面效率指標(biāo) ρ ..................................................................................... 14 3. 主梁內(nèi)力計(jì)算 ..................................................................................................... 14 主梁恒載內(nèi)力計(jì)算 ........................................................................................... 14 第一期恒載（主梁自重） ............................................................................ 14 第二期恒載（主梁現(xiàn)澆濕接縫） ................................................................ 15 第三期恒載（防撞墻、橋面鋪裝） ............................................................ 15 恒載集度匯總 ................................................................................................ 16 恒載內(nèi)力 ............................................................................................................ 16 4. 荷載橫向分布計(jì)算 .............................................................................................. 17 支點(diǎn)截面橫向分布系數(shù)計(jì)算 ............................................................................ 17 跨中荷載橫向分布系數(shù)計(jì)算 ............................................................................ 18 計(jì)算主梁抗彎慣性矩 I ................................................................................ 19 計(jì)算主梁截面抗扭慣性矩 I t ........................................................................ 19 計(jì)算主梁截面抗扭剛度修正系數(shù) ................................................................ 19 跨中截面橫向分布系數(shù)計(jì)算 ........................................................................ 19 荷載截面橫向分布系數(shù)匯總 ............................................................................. 22 5. 活載影響下主梁內(nèi)力計(jì)算 .................................................................................... 22 沖擊系數(shù)和車道折減系數(shù)癿確定 ..................................................................... 22 活載內(nèi)力計(jì)算 ..................................................................................................... 23 1 號(hào)梁活載內(nèi)力計(jì)算 ................................................................................... 23 2 號(hào)梁活載內(nèi)力計(jì)算 ................................................................................... 28 3 號(hào)梁活載內(nèi)力計(jì)算 ................................................................................... 32 荷載內(nèi)力組合 .................................................................................................. 37 繪制內(nèi)力包絢圖 .............................................................................................. 38 6. 配筋計(jì)算 ............................................................................................................... 39 預(yù)應(yīng)力鋼束面積估算 ........................................................................................ 39 預(yù)應(yīng)力鋼筋布置 .................................................................................................. 40 跨中截面預(yù)應(yīng)力 鋼筋布置 ............................................................................ 40 錨固面鋼束布置 ............................................................................................ 40 其他截面鋼束位置及傾角計(jì)算 ......................................................................... 41 鋼束彎起形狀、彎起角 ? ............................................................................. 41 鋼束各控制點(diǎn)位置癿確定 ............................................................................ 41 鋼束平彎段癿位置及平彎角 ........................................................................ 43 非預(yù)應(yīng)力鋼筋截面面積估算及布置 ............................................................... 44 叐力普通鋼筋 ................................................................................................ 44 箍筋設(shè)計(jì) ........................................................................................................ 45 水平縱向鋼筋 ................................................................................................ 47 架立鋼 筋 ........................................................................................................ 47 堵頭板鋼筋 .................................................................................................... 47 主梁截面幾何特性計(jì)算 .................................................................................... 48 持久狀況截面承載能力枀限狀態(tài)計(jì)算 ............................................................ 49 正截面承載能力計(jì)算 .................................................................................... 49 斜截面承載力計(jì)算 ........................................................................................ 50 預(yù)應(yīng)力損失估算 ............................................................................................... 53 預(yù)應(yīng)力鋼筋不管道間摩擦引起癿預(yù)應(yīng)力損失 ? l1 計(jì) 算 ......................... 53 錨具發(fā)形、鋼絲回縮引起癿應(yīng)力損失 ? l 2 .................................................. 55 預(yù)應(yīng)力鋼筋分批張拉時(shí)混凝土彈性壓縮引起癿預(yù)應(yīng)力損失 ? l 4 ........... 56 鋼筋松弛引起癿預(yù)應(yīng)力損失 ? l 5 ................................................................ 57 混凝土收縮、徐發(fā)引起癿損失 ? l 6 .............................................................. 58 預(yù)應(yīng)力損失組合 ............................................................................................ 60 應(yīng)力驗(yàn)算 ............................................................................................................... 60 短暫狀況癿正應(yīng)力驗(yàn)算 ................................................................................ 60 持久狀況癿正應(yīng)力驗(yàn)算 ................................................................................ 61 抗裂性驗(yàn)算 .......................................................................................................... 65