某3×25m=75m三跨预应力混凝土连续梁桥，混凝土强度等级为C50，桥跨布置详见CAD图纸；预应力钢束布置详见CAD图纸（忽略钢束平弯），采用塑料波纹管、两端张拉，锚具回缩6mm、低松弛钢绞线。

目录
1. 设计资料 --------------------------------------------------------------------------------------- - 3 -
1.1 基本计算参数 --------------------------------------------------------------------------------- - 3 -
1.2 施工过程 ---------------------------------------------------------------------------------------- - 3 -
2. 建模过程 --------------------------------------------------------------------------------------- - 3 -
2.1 定义材料、截面 ------------------------------------------------------------------------------ - 3 -
2.2 建立节点、单元 ------------------------------------------------------------------------------ - 4 -
2.3 边界条件 ---------------------------------------------------------------------------------------- - 5 -
3. 预应力计算------------------------------------------------------------------------------------ - 5 -
3.1 钢束定义 ---------------------------------------------------------------------------------------- - 5 -
3.2 施加预应力荷载 ------------------------------------------------------------------------------ - 6 -
4. 施工阶段计算 -------------------------------------------------------------------------------- - 7 -
4.1 施工阶段划分 --------------------------------------------------------------------------------- - 7 -
4.2 现浇混凝土、张拉预应力阶段分析 --------------------------------------------------- - 7 -
4.3 落架施工，自重荷载 ----------------------------------------------------------------------- - 8 -
4.4 二期恒载分析 --------------------------------------------------------------------------------- - 9 -
5. 成桥状态计算 ------------------------------------------------------------------------------- - 10 -
5.1 特征值分析 ----------------------------------------------------------------------------------- - 10 -
5.2 公路Ⅰ级汽车荷载效应 ------------------------------------------------------------------ - 10 -
5.3 支座沉降荷载效应 ------------------------------------------------------------------------- - 12 -
5.4 整体升温/降温荷载效应 ----------------------------------------------------------------- - 12 -
5.5 梁截面温差荷载效应 --------------------------------------------------------------------- - 13 -
6. 预应力损失----------------------------------------------------------------------------------- - 14 -
6.1 收缩/徐变参数 ------------------------------------------------------------------------------ - 14 -
6.2 预应力分项损失 ---------------------------------------------------------------------------- - 15 -
6.3 顶板预应力损失 ---------------------------------------------------------------------------- - 15 -
6.4 腹板预应力损失 ---------------------------------------------------------------------------- - 16 -
6.5 底板预应力损失 ---------------------------------------------------------------------------- - 18 -
7. 内力组合 -------------------------------------------------------------------------------------- - 19 -
7.1 选择荷载组合 ------------------------------------------------------------------------------- - 19 -
7.2 基本组合 -------------------------------------------------------------------------------------- - 19 -
7.3 短期组合 -------------------------------------------------------------------------------------- - 20 -
7.4 长期组合 -------------------------------------------------------------------------------------- -20