Analysis of Load Bearing Behavior and Deformation of Cast-in-Situ Stitches with Glass Fiber Reinforced Concrete and U Reinforcement Among Deck Panels of Precast Segmental Bridge
A method of using glass fiber reinforced concrete and Ureinforcement to optimize the cast-in-situ stitches among deck panels of the precast segmental bridge is proposed,aiming to ensure the load bearing stability and reduce deformation of the stitches.A mainline viaduct of Rongcheng-Wuhai Expressway in Xiong'an New Area is used as a case for the study.Two test sections were taken from the viaduct to investigate the performance of the cast-in-situ stitches among deck panels,test section A contains cast-in-situ stitches with normal concrete and spot-welded reinforcement,and test section B incorporates cast-in-situ stitches of glass fiber reinforced concrete and all-welded Ureinforcement.The monitoring focuses included the mechanical responses of the lapped reinforcement in cast-in-situ stitches and deformation characteristics of concrete contacting faces,as well as the load bearing capacity of reinforcement and concrete deformation under long-term vehicle loads and heavy rains.It is shown that under long-term vehicle loads,the load bearing behaviors of transverse reinforcement in test section B is half of that of the section A,and the reinforcement in the central zone bears greater loads than the edge reinforcement,and also greater loads than that in the central zone of test section A,indicating the stability of test section B is superior to test section A.In addition,the deformation of cast-in-situ stitches in test section B is smaller,indicating better stability and durability.Under heavy rains,the deformation and fluctuation of mechanical responses of test section B are lower,displaying better impermeability and durability.It is proved that the cast-in-situ stitches with glass fiber reinforced concrete and Ureinforcement own sound external force transfer and deformation resistant stability,and are not sensitive to harsh environments.
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