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针对预应力混凝土连续箱梁桥出现裂缝比较普遍的现状,分析了常见的裂缝形式及其成因,指出目前用于箱梁计算的平面杆系理论或空间梁格理论的局限和不足,提出用梁段单元空间分析法对箱梁进行计算;总结设计经验和教训,借鉴钢桁梁和箱梁裂缝加固比拟法,对预应力混凝土连续箱梁桥的构造设计提出了建议,并对容易导致裂缝的施工环节提出了具体的要求。 裂缝;;箱梁;;梁段单元法;;比拟法;;构造设计
In view of the prevalence of cracks in prestressed concrete continuous box girder bridges, the common forms of fractures and their causes are analyzed. The limitations and shortcomings of the planar beam theory or space beam theory currently used in box girder calculation are pointed out. The calculation of box girder is carried out by the method of spatial analysis of segment elements; the design experience and lessons are summarized, and the comparison of steel truss girder and box girder crack reinforcement is proposed to make some suggestions on the structural design of prestressed concrete continuous box girder bridge. Construction links made specific requirements. Crack; box beam; beam section element method; comparison method ;; structural design