【正文】 法：偏心受壓法 ........................................17 荷載橫向分布系數(shù)匯總 ..........................................................................22 荷載內力計算 ............................................................................................22 荷載集度 ................................................................................................22 恒載內力 ................................................................................................24 活載內力計算 .........................................................................................26 主梁內力組合 .........................................................................................40 5 預應力鋼筋面積的估算及預應力筋布置 .....................................................43 預應力鋼筋截面積估算 .............................................................................43 預應力鋼筋布置 ........................................................................................44 跨中截面預應力鋼筋的布置 ..................................................................44 錨固面鋼束布置 .....................................................................................44 其他截面鋼束位置及傾角計算 ...............................................................45 鋼束平彎段的位置及平彎角 ..................................................................49 非預應力鋼筋截面估計及布置 ..................................................................49 6 主梁截面幾何特性計算 ................................................................................52 第一階段：主梁預制并張拉預應力鋼筋 ...................................................53 跨中截面 ................................................................................................53 四分之一跨截面 .....................................................................................58 變化點截面 .............................................................................................60 支點截面 ................................................................................................62 第二階段：灌漿封錨，主梁吊裝就位并現(xiàn)澆 200mm 濕接縫 ......................64 跨中截面 ................................................................................................64 四分之一跨截面 .....................................................................................66 變化點截面 .............................................................................................68 支點截面 ................................................................................................70 第三階段：橋 面、欄桿及人行道施工和運營階段 ....................................72 跨中截面 ................................................................................................72 四分之一跨截面 .....................................................................................74 變化點截面 .............................................................................................76 支點截面 ................................................................................................78 7 持久狀況截面承載能力極限狀態(tài)計算 .........................................................81 正截面承載力計算 .....................................................................................81 斜截面承載力計算 .....................................................................................82 斜截面抗剪承載力 .................................................................................82 斜截面抗彎承載力 .................................................................................83 8 鋼束預應力損失估算 ...................................................................................84 預應力鋼筋張拉（錨下）控制應力計算 ...................................................84 鋼束應力損失 ............................................................................................84 預應力鋼筋與管道間摩擦引起的預應力損失 1l? ....................................84 錨具變形、鋼絲回縮引起的預應力損失 2l? ...........................................88 預應力鋼筋分批張拉時混凝土彈性壓縮引起的應力損失 4l? .................89 鋼筋松弛引起的預應力損失 5l? ..............................................................90 混 凝土收縮、徐變引起的損失 6l? ..........................................................91 9 應力驗算 ......................................................................................................94 短暫狀況下的正應力驗算 .........................................................................94 持久狀況下的正應力驗算 .........................................................................95 截面混凝土的正應力驗算 ......................................................................95 持久狀況下預應力鋼筋的應力驗算 .......................................................97 持久狀況下的混凝土主應力驗算 ...........................................................97 10 抗裂性驗算 .............................................................................................. 106 作用短期效應組合作用下的正截面抗裂驗算 ........................................ 106 預加力產(chǎn)生的構件抗裂驗算邊緣的混凝土預壓應力的計算 .............. 106 由荷載產(chǎn)生的構件抗裂性驗算邊緣混凝土的法向拉應力的計算 ....... 106 正截面混凝土抗裂驗算 ...................................................................... 106 作用短期效應組合作用下的斜截面抗裂驗算 ........................................ 107 主應力計算 ......................................................................................... 107 主壓應力的限制值 .............................................................................. 110 11 主梁變形（撓度）計算 ............................................................................ 111 荷載短期效應作用下截面不開裂撓度驗算 ............................................ 111 可變荷載作用引起的撓度 .................................................................. 111 考慮長期效應的一期荷載、二期荷載引起的撓度 ............................. 112 預加力引起的上拱度值計算 .................................................................. 112 預拱度的設置 ........................................................................................ 113 12 錨固區(qū)局部承壓計算 ............................................................................... 114 局部受壓區(qū)尺寸要求 ............................................................................. 114 局部抗壓承載力計算 .......