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箱梁具有较大的抗弯抗扭刚度、较好的整体性及连续性等诸多优点,常用于连续梁及连续刚构桥。调查发现该类桥近年来出现开裂、下挠病害较多,其中有效截面尺寸偏小导致腹板出现主应力开裂病害较多,但也有因施工、甚致设计因素导致部分桥梁出现斜截面抗剪极限承载力不足。某预应力混凝土连续箱梁桥,其斜截面抗剪极限承载力不足(不满足规范对截面抗剪下限值的要求,即构造尺寸偏小)需进行加固,本文介绍了该加固工程,包括方案设计阶段的多方案比选,加固设计的计算分析,最后总结加固施工中的关键点,供此类病害桥梁加固借鉴。
Box girder has a larger bending torsional stiffness, better integrity and continuity and many other advantages, commonly used in continuous beams and continuous rigid frame bridge. The survey found that in recent years, such bridges have cracked and flexed more, and the effective cross-sectional size is too small to cause the main stress cracks in the web. However, some bridges also have oblique-section shear due to construction, even design factors The ultimate bearing capacity is not enough. For a prestressed concrete continuous box-girder bridge, the ultimate bearing capacity of the slant section is not sufficient (it does not meet the requirements of the specification for the lower shear limit value of the section, that is, the structural size is too small) to be reinforced. This article introduces the reinforcement project including Program design phase of the multi-program comparison, reinforcement design of the calculation and analysis, and finally summarize the key points in the reinforcement construction for the reinforcement of such diseases bridge reference.