30m预应力混凝土简支T梁计算书

目 录

1 设计依据..............................................................................................................................3 2 设计资料及上部结构主要尺寸..........................................................................................3 2.1 设计资料.................................................................................................................................3 2.2 梁部结构主要尺寸.................................................................................................................4 2.3 横截面沿跨长的变化.............................................................................................................7 2.4 横隔梁的设置.........................................................................................................................7

3 主梁作用效应计算..............................................................................................................7 3.1 永久作用效应计算.................................................................................................................7 3.2 可变作用效应计算（G—M法）...........................................................................................9 3.3 主梁作用效应组合...............................................................................................................19

4 预应力钢束的估算及其布置............................................................................................20 4.1 跨中截面钢束的估算和确定...............................................................................................20 4.2 预应力钢束布置...................................................................................................................23

5 计算主梁截面几何特性....................................................................................................26 5.1 截面面积及惯矩计算...........................................................................................................26 5.2 截面静矩计算.......................................................................................................................28 5.3 截面几何特性汇总...............................................................................................................28

6 钢束预应力损失计算........................................................................................................29 6.1 预应力钢束与管道壁之间的摩擦引起的预应力损失........................................................29 6.2 由锚具变形、钢束回缩引起的预应力损失........................................................................30 6.3 混凝土弹性压缩引起的预应力损失....................................................................................32 6.4 由钢束应力松弛引起的预应力损失....................................................................................33 6.5 混凝土收缩和徐变引起的预应力损失................................................................................35 6.6 预加力计算以及钢束预应力损失汇总................................................................................37

7 主梁截面承载力与应力验算............................................................................................38 7.1 持久状况承载能力极限状态承载力验算............................................................................38 7.2 持久状况正常使用极限状态抗裂验算................................................................................44 7.3 持久状况构件的应力验算...................................................................................................49