Research on the Force Characteristics and Anti-cracking Scheme of TY Composite Pier during Construction Period
The approach bridges of the Huangmaohai Sea-crossing Channel adopts TY composite pier plus split steel box girder structure,the composite piers are built by overturning mold method plus bracket method,and steel box girder is erected by floating crane in different widths.The finite element method is used to analyze the whole construction process of TY composite pier which is structurally complex and eccentrically pressurized,and the results show that:the composite pier faces large cracking risk in the construction process,and there is a large risk of cracking of the pier body during the casting of cover beams at the root of V-legs,the local bottom edge of the outer side of cover beams during prestressing tensioning,and the erection of the steel box girder in separate widths.Based on the studies of anti-cracking schemes during the construction period of composite pier,additional prestressing is used to solve the cracking problem of V-leg root;the prestressing scheme is optimized to solve the cracking problem of cover girder;three kinds of anti-cracking schemes for the pier shaft are proposed,which are transverse shifting of girder,installation of additional counterweights and increase of vertical prestressing,and the analysis of feasibility and relative optimal solution is carried out,and the installation of vertical prestressing is recommended to be adopted after comparisons in terms of technical and economic aspects.Field application results show that the above measures can effectively reduce the risk of cracking during the construction of composite piers.
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