research progress on accelerated corrosion test method which can evaluate the corrosion protecveness of the post tensioning grouts is reviewed.

综述了近期国内外在后张预应力结构灌浆材料加速腐蚀实验方面的研究进展。

the formula for calculating the ultimate stress of unbonded post tensioning tendons and the calculating method of ultimate flexural strength of uppc beam bridges are proposed.

在此基础上给出了无粘结预应力筋极限应力计算公式和uppc梁正截面抗弯强度计算方法。

a foreign parking garage can't operate normally, since the heat seal is increasingly damaged due to bad heat seal protection in post tensioning wire cable.

国外的某停车库由于后张拉钢丝束的热封保护不良而逐渐损坏，导致本库不能正常使用。

based on the analysis of the experimental data and the research results reported in references, the practical calculating equation of the ultimate stress in unbonded post tensioning is proposed.

在分析国内外大量试验数据和文献研究的基础上 ，建立了无粘结预应力筋极限应力实用计算方法。

the key to calculate the ultimate flexural strength of unbonded partially prestressed concrete(uppc) beam bridges is how to determine the ultimate stress of unbonded post tensioning tendons.

无粘结部分预应力混凝土（uppc）梁桥抗弯强度计算的关键，是如何确定无粘结预应力筋的极限应力。

by the construction of post tensioning prestress concrete bridge superstructure, the paper discussed some experience on preventing tensioning strand from break for reference.

通过后张法预应力砼桥梁上部结构的施工，总结预防张拉钢绞线断丝经验，以便指导施工生产。