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考虑第一批预应力损失的后张法箱梁张拉顺序优化

Keywords: 张拉顺序,预应力损失,预应力筋张拉,预应力混凝土箱梁,有限元分析

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Abstract:

基于预应力钢筋第一批预应力损失最小原则,在构件应力和变形允许的范围内利用有限元软件实现第一批预应力损失及预应力钢筋张拉过程的模拟.同时,提出了一种在有限元软件中模拟预应力钢筋与管道间摩擦损失,锚具变形、钢筋回缩和接缝压缩损失和混凝土弹性压缩预应力损失的计算方法,并给出了一种有限元模拟预应力的修正方法.利用ANSYS软件对后张法预应力混凝土箱梁张拉顺序进行数值模拟,根据仿真结果给出了适用于不同施工工艺的最优预应力张拉顺序.

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