箱体梁垂向预应力损耗现场测量分析

Analysis on Field Experimental Measurement of Vertical Prestress Loss of Box Girder

计算了混凝土收缩徐变损耗、混凝土弹塑性压缩损耗、钢束松弛损耗、垂向预应力筋的摩擦损耗以及锚固损耗值,完成了箱体梁垂向预应力筋损耗的现场测量分析。计算和检测成果比较显示,计算方法对箱体梁垂向预应力筋的损耗计算有效、适用和安全,对同类工程计算应用有技术参考价值。

The shrinkage and creep loss of concrete,the elastic-plastic compression loss of concrete,the relaxation loss of steel tendon,the friction loss of vertical prestressed reinforcement and the loss value of anchorage are calculated.The field measurement and analysis of vertical prestress loss are completed.The calculation and measurement results after compared show that the calculation methods are effective,applicative and safe to calculate the loss of vertical prestressed reinforcement of box girder,which have the technical reference value for the similar engineering calculation applications.