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通过对一座运营期内底板产生纵向裂缝病害的大跨连续刚构桥的现场检测、有限元模拟分析,探讨了刚构桥此类裂缝的病害成因;在此基础上,对箱梁底板粘贴横向钢板带(被动加固)和张拉横向预应力碳纤维板(主动加固)的加固效果进行了比较。结果表明:曲线预应力合龙束引起的横向附加应力,以及箱内外温差引起的横向应力的联合作用,是导致大跨连续刚构桥底板产生纵向裂缝的主要原因;箱梁底板粘贴横向钢板带的被动加固方案,可以起到限制裂缝发展的作用;底板张拉预应力碳纤维板,将底板受力提升为预应力A类构件,更好地提高了结构的耐久性。
Through the on-site inspection and finite element simulation analysis of the long-span continuous rigid frame bridge with longitudinal cracks in the floor during the operation period, the causes of such cracks in rigid frame bridge were discussed. On this basis, Steel strip (passive reinforcement) and tensile prestressed transverse prestressed carbon fiber reinforced board (active reinforcement) were compared. The results show that the combined effect of lateral additional stress caused by the prestressing strands and the lateral stress caused by the temperature difference between the inside and outside of the box is the main reason for the longitudinal cracks in the floor of continuous rigid frame bridge. Passive reinforcement program can play a role in limiting the development of cracks; the bottom of the board prestressed tensile carbon fiber board, the bottom plate was stressed to enhance the prestressed Class A components, to better improve the durability of the structure.