预应力砼连续箱梁桥裂缝成因分析及防治措施

Reason analysis and preventive measures for cracking of prestressed concrete continuous box girder bridges

针对目前大跨径预应力砼连续箱梁普遍开裂的情况,从预应力筋的合理设置、计算方法的选取、温差应力的影响、应力控制值以及非预应力筋配置等几方面进行了裂缝成因分析,并提出了防止裂缝的设计建议和构造措施.

Some factors that induce cracking of prestressed concrete continuous box girder bridges are discussed, such as prestressing tendons,calculation method, temperature stress, concrete stress control, etc. The results obtained from the calculation are presented to demonstrate the effect of these factors. Several design recommendations and construction measures are proposed to resist cracking of long-span continuous box Order bridges.