通过对 782块先张法预应力混凝土板的检测和其中 3块板的结构实验 ,深入地分析了这批预应力混凝土板的反拱较为分散的原因 .分析表明 ,其中最主要的原因是预应力钢绞线有效预应力值不准确 .分析还表明 ,对于预拉区出现裂缝的预应力混凝土板计算反拱时 ,应考虑裂缝对其截面刚度的影响 . Through the testing of 782 pretensioned prestressed concrete slabs and the structure experiment of three of them, the reason of the reverse arching of these prestressed concrete slabs is analyzed deeply.The analysis shows that the most important reason is that The analysis of the effective prestressing value of the stress steel strand is also inaccurate.The analysis also shows that the influence of the crack on the section stiffness should be considered when calculating the back arch for the prestressed concrete slab in the pre-tension zone.