Abstract
Aiming at the characteristics of poor corrosion resistance, high maintenance frequency and high cost of steel box girder pedestrian bridge structure, and the traditional concrete is thick and moderate in strength, this paper proposes a method to apply reactive powder concrete RPC to the existing pedestrian bridge deck and uses steel-RPC composite box girder as the bridge superstructure. Based on the research on the RPC material and the related performance of its components, the feasibility and reliability of RPC applied to beam-slab composite members are verified. By comparing steel-RPC composite box girder, steel box girder, and steel-general concrete composite box girder, it is found that steel-RPC composite box girder is superior in terms of mechanical performance, economic evaluation, and aesthetics. The research shows that the steel-RPC composite box girder is more suitable for the steel box girder pedestrian bridge reconstruction project and the new pedestrian bridge project across urban roads.
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