Abstract: 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，ere．The results obtained from the calculation are presented to demonstrate the effect of these factors．Several design recommendadons and construction measures are proposed to resist cracking 0f long-span continuous box gilder bridge．

Key words: continuous box girder, prestressed concrete bridge, cracking, temperature stress, finite dement method, cracking resistance

摘要： 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．

关键词: 连续箱梁, 预应力砼桥梁, 裂缝, 温度应力, 有限元法, 抗裂