某3×25m=75m三跨預(yù)應(yīng)力混凝土連續(xù)梁橋，混凝土強(qiáng)度等級(jí)為C50，橋跨布置詳見CAD圖紙；預(yù)應(yīng)力鋼束布置詳見CAD圖紙（忽略鋼束平彎），采用塑料波紋管、兩端張拉，錨具回縮6mm、低松弛鋼絞線。
目錄
1. 設(shè)計(jì)資料 --------------------------------------------------------------------------------------- - 3 -
1.1 基本計(jì)算參數(shù) --------------------------------------------------------------------------------- - 3 -
1.2 施工過程 ---------------------------------------------------------------------------------------- - 3 -
2. 建模過程 --------------------------------------------------------------------------------------- - 3 -
2.1 定義材料、截面 ------------------------------------------------------------------------------ - 3 -
2.2 建立節(jié)點(diǎn)、單元 ------------------------------------------------------------------------------ - 4 -
2.3 邊界條件 ---------------------------------------------------------------------------------------- - 5 -
3. 預(yù)應(yīng)力計(jì)算------------------------------------------------------------------------------------ - 5 -
3.1 鋼束定義 ---------------------------------------------------------------------------------------- - 5 -
3.2 施加預(yù)應(yīng)力荷載 ------------------------------------------------------------------------------ - 6 -
4. 施工階段計(jì)算 -------------------------------------------------------------------------------- - 7 -
4.1 施工階段劃分 --------------------------------------------------------------------------------- - 7 -
4.2 現(xiàn)澆混凝土、張拉預(yù)應(yīng)力階段分析 --------------------------------------------------- - 7 -
4.3 落架施工，自重荷載 ----------------------------------------------------------------------- - 8 -
4.4 二期恒載分析 --------------------------------------------------------------------------------- - 9 -
5. 成橋狀態(tài)計(jì)算 ------------------------------------------------------------------------------- - 10 -
5.1 特征值分析 ----------------------------------------------------------------------------------- - 10 -
5.2 公路Ⅰ級(jí)汽車荷載效應(yīng) ------------------------------------------------------------------ - 10 -
5.3 支座沉降荷載效應(yīng) ------------------------------------------------------------------------- - 12 -
5.4 整體升溫/降溫荷載效應(yīng) ----------------------------------------------------------------- - 12 -
5.5 梁截面溫差荷載效應(yīng) --------------------------------------------------------------------- - 13 -
6. 預(yù)應(yīng)力損失----------------------------------------------------------------------------------- - 14 -
6.1 收縮/徐變參數(shù) ------------------------------------------------------------------------------ - 14 -
6.2 預(yù)應(yīng)力分項(xiàng)損失 ---------------------------------------------------------------------------- - 15 -
6.3 頂板預(yù)應(yīng)力損失 ---------------------------------------------------------------------------- - 15 -
6.4 腹板預(yù)應(yīng)力損失 ---------------------------------------------------------------------------- - 16 -
6.5 底板預(yù)應(yīng)力損失 ---------------------------------------------------------------------------- - 18 -
7. 內(nèi)力組合 -------------------------------------------------------------------------------------- - 19 -
7.1 選擇荷載組合 ------------------------------------------------------------------------------- - 19 -
7.2 基本組合 -------------------------------------------------------------------------------------- - 19 -
7.3 短期組合 -------------------------------------------------------------------------------------- - 20 -
7.4 長(zhǎng)期組合 -------------------------------------------------------------------------------------- -20
