【正文】 1 20m跨預(yù)應(yīng)力混凝土空心板計(jì)算示例 目錄 1 計(jì)算依據(jù)與基礎(chǔ)資料 ......................................... 3 標(biāo)準(zhǔn)及規(guī)范 .............................................................................................................................. 3 標(biāo)準(zhǔn) .............................................................................................................................. 3 規(guī)范 .............................................................................................................................. 3 參考資料 ...................................................................................................................... 3 主要材料 .................................................................................................................................. 3 設(shè)計(jì)要點(diǎn) .................................................................................................................................. 3 2 橫斷面布置 ............................................... 4 3 汽車荷載橫向分布系數(shù)、沖擊系數(shù)的計(jì)算 ............................. 4 汽車荷 載橫向分布系數(shù)計(jì)算 .................................................................................................. 4 跨中橫向分布系數(shù) ...................................................................................................... 4 車道折減系數(shù) .............................................................................................................. 6 汽車荷載沖擊系數(shù) ? 值計(jì)算 ................................................................................................. 6 ? .................................................. 錯誤 !未定義書簽。 汽車荷載的局部加載的沖擊系數(shù) .............................................................................. 7 4 作用效應(yīng)組合 ............................................. 7 作用的標(biāo)準(zhǔn)值 .......................................................................................................................... 7 永久作用標(biāo)準(zhǔn)值 .......................................................................................................... 7 汽車荷載效應(yīng)標(biāo)準(zhǔn)值 .................................................................................................. 8 作用效應(yīng)組合 ........................................................................................................................ 10 基本組合（用于結(jié)構(gòu)承載能力極限狀態(tài)設(shè)計(jì)） .................................................... 10 作用短期效應(yīng)組合 (用于正常使用極限狀態(tài)設(shè)計(jì) ) ................................................ 12 作用長期效應(yīng)組合（用于正常使用極限狀態(tài)設(shè)計(jì)） ............................................ 12 截面預(yù)應(yīng)力鋼束估算及幾何特性計(jì)算 ................................................................................ 14 A類部分預(yù)應(yīng)力混凝土受彎構(gòu)件受拉區(qū)鋼筋面積估算 ......................................... 14 換算 截面幾何特性計(jì)算 ............................................................................................ 16 5 持久狀態(tài)承載能力極限狀態(tài)計(jì)算 ................................. 17 2 正截面抗彎承載能力 ............................................................................................................ 17 斜截面抗剪承載力驗(yàn)算 ........................................................................................................ 18 驗(yàn)算受彎構(gòu)件抗剪截面尺寸是否需進(jìn)行抗剪強(qiáng)度計(jì)算 ........................................ 18 箍筋設(shè)置 .................................................................................................................... 22 6 持久狀況正常使用極限狀態(tài)計(jì)算 ................................. 23 預(yù)應(yīng)力鋼束應(yīng)力損失計(jì)算 .................................................................................................... 23 張拉控制應(yīng)力 ............................................................................................................ 23 各項(xiàng)預(yù)應(yīng)力損失 ........................................................................................................ 23 溫度梯度截面上的應(yīng)力計(jì)算 ................................................................................................ 27 抗裂驗(yàn)算 ................................................................................................................................ 30 正截面抗裂驗(yàn)算 ........................................................................................................ 30 斜截面抗裂計(jì)算 ........................................................................................................ 32 撓度驗(yàn)算 ................................................................................................................................ 34 汽 車荷載引起的跨中撓度 ........................................................................................ 34 預(yù)制板是否設(shè)置預(yù)拱值的計(jì)算 ................................................................................ 35 7 持久狀態(tài)和短暫狀況構(gòu)件應(yīng)力計(jì)算 ................................ 37 使用階段正 截面法向應(yīng)力計(jì)算 ............................................................................................ 37 受壓區(qū)混凝土的最大壓應(yīng)力 .................................................................................... 37 受拉區(qū)預(yù)應(yīng)力鋼筋的最大拉應(yīng)力 ............................................................................ 37 使用階段混 凝土主壓應(yīng)力、主拉應(yīng)力計(jì)算 ........................................................................ 38 施工階段應(yīng)力驗(yàn)算 ................................................................................................................ 40 8 橋面板配筋計(jì)算 ........................................... 42 荷載標(biāo)準(zhǔn)值計(jì)算 .................................................................................................................... 42 計(jì)算跨徑 .................................................................................................................... 42 跨中彎矩計(jì)算 ............................................................................................................ 42 支點(diǎn)剪力 .................................................................................................................... 44 極限狀態(tài)承載力計(jì)算 ............................................................................................................ 44 荷載效應(yīng)組合計(jì)算 .................................................................................................... 44 正截面抗彎承載力 ..........