Crack Control Technology for Long-span Prestressed Concrete Bridges
Based on the problems of cracking along the longitudinal direction of the bottom plate and concrete collapse in the mid span of prestressed concrete bridges,which are prone to occur in structures such as wide boxes,thin walls,and few belly plates,this study analyzes the common crack mechanisms,causes,and control reinforcement measures of prestressed concrete bridges.By combining field investigation and experimental analysis,the problems of bridge load,temperature,concrete shrinkage,foundation deformation,and steel corrosion were elaborated.The mechanism and causes of cracks in prestressed concrete bridges were analyzed,and corresponding bridge crack control methods and reinforcement processes were proposed.Technical measures such as constructing a concrete shrinkage pre-diction model,designing a reasonable concrete mix ratio,and strengthening concrete temperature control were also taken to effectively prevent and control the occurrence of cracks in prestressed concrete bridges.
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