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在重载交通和施工先天缺陷的情况下,以前设计的浅铰缝到目前常用的深铰缝,均出现不同程度的损坏,因此削弱了板梁之间的横向整体性和刚度,甚至出现单板受力现象,危及结构的安全。针对这一问题,以5×13m的预应力混凝土空心板梁桥为研究背景,设计了底板单向体外束和顶底板双向体外束的两种加固方案。借助于ANSYS实体有限元模型,分析了板梁跨中截面,在加固前、方案1和方案2三个对象的空间应力状态和横向分布性能,对比了两种方案的加固效果,从而根据具体情况,选择合理的加固方案。
In the case of overloaded traffic and construction defects, the previously designed shallow hinge joints to the commonly used deep-drawn joints all showed different degrees of damage, thus weakening the transverse integrity and stiffness between the plate girders and even single Board stress phenomenon, endanger the safety of the structure. In response to this problem, two kinds of reinforcement schemes of unidirectional in vitro beam and top-bottom two-way external beam are designed with 5 × 13m prestressed concrete hollow girder bridge as research background. The finite element model of ANSYS was used to analyze the mid-section of slab beam. Before the reinforcement, the spatial stress state and horizontal distribution of three objects in Scheme 1 and Scheme 2 were compared. The reinforcement effects of the two schemes were contrasted, , Choose a reasonable reinforcement program.