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当已有的普通钢筋混凝土简支空心板桥在进行横向拓宽时,新桥拟采用预应力混凝土空心板结构,研究了旧桥普通钢筋混凝土空心板与新桥预应力混凝土空心板等两种不同配筋混凝土结构之间横向拼接可行性问题。采用空间梁格有限元方法进行分析研究,研究成果表明:从结构内力的分配角度看,预应力混凝土结构与钢筋混凝土结构的横向拼接应该更有利于旧桥结构的内力状态改善,对于旧桥各主梁的内力及结构变形都有一定程度的卸载作用,因此这种不同配筋种类的空心板桥之间进行横向拼接是可行的,而且旧桥各空心板梁的受力状态可符合原设计规范的要求。研究成果将为今后不同结构形式的空心板梁桥横向扩建设计时提供可参考性的设计建议。
When the existing ordinary reinforced concrete hollow slab bridge in the horizontal expansion, the new bridge intends to adopt prestressed concrete hollow slab structure, the old bridge ordinary reinforced concrete hollow slab and Xinqiao prestressed concrete hollow slab two different Feasibility of transverse splicing between reinforced concrete structures. The results of the research show that the transverse splicing between the prestressed concrete structure and the reinforced concrete structure should be more conducive to the improvement of the internal force state of the old bridge structure, The internal forces and structural deformation of the main girder have a certain degree of unloading effect, so that this kind of different types of reinforced hollow slab bridge horizontal splicing is feasible, and the old bridge of the hollow girder stress state can be consistent with the original design Regulatory requirements. The research results will provide reference design suggestions for the transverse expansion design of hollow slab bridges with different structural forms in the future.