预应力混凝土空心板反拱的检测和分析  

An Examination and Analysis of Reversed Deflection of Pre-Stressed Concrete Hollow Slabs

作　　者：蓝宗建[1] 张军[2] 庞同和[1] 夏文俊[2] 郭恒宁[1] 周金强 

机构地区：[1]东南大学土木工程学院,南京210096 [2]江苏省高速公路建设指挥部,南京210005

出　　处：《东南大学学报（自然科学版）》2000年第4期21-26,共6页Journal of Southeast University：Natural Science Edition

摘　　要：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 .On the basis of the inspection on 782 pre stressed concrete hollow slabs and the structural tests of 3 ones, a thorough analysis on the causes of the dispersion of reversed deflection of the ones is made. The analysis shows that the most important cause is the dispersion of the effective pre stresses of the pre stressed strand. The analysis also shows that the cracks in pretension area of the pre stressed concrete members have an important effect on the stiffness of the members, therefore the effect on the stiffness of pre stressed concrete member must be taken into account when the reversed deflections of the ones are predicted.

关 键 词：预应力混凝土 反拱 裂缝 检测 板材 

分 类 号：TU378.503[建筑科学—结构工程]