Research on Erecting Corrugated Steel Webs Ahead of and Asynchronous with Cantilever Casting of Concrete Girders
With the main span length reaching 105 m,the main bridge of Damogou Bridge consists of two superstructures of prestressed concrete girders that act compositely with corrugated steel webs.To facilitate the erection of the corrugated steel webs and effectively manage personnel scheduling,it was proposed to simultaneously erect the corrugated steel webs(CSWs)in two girder segments at the early stage of cantilever casting,and to use the controlled geometry of the previously-erected CSWs to determine the girder segments that were the best choices for the method.The construction process was simulated in Abaqus to verify the applicability and efficiency of the proposed method.The load bearing behavior and deformation of the superstructures before and after the modification of the asynchronous pouring construction(APC).The proposed method was applied to a real bridge.The numerical simulation and engineering practice demonstrated that it was proper to erect the girder segments No.2-No.6 by the proposed method,where the CSWs in the exact girder segment and the next two segments would be erected ahead of the cantilever casting of concrete,and the maximum pre-camber of the CSWs in the neighboring segment should be set at 6.4 mm.The modified method would not induce great variation of the stresses in the top and bottom slabs of each segment,shear stresses in and deflections of the adjacent webs,and the calculated stresses were smaller than design strengths suggested in the code.To minimize the safety risk,the proposed method was only applied to the construction of the girder segments No.2-No.4 at pier No.1 in the right superstructure,allowing the elevations of CSWs to be within controllable ranges.The measured deflections of CSWs were consistent with the numerical simulation,proving the feasibility and effectiveness of the proposed method.
composite girder bridgecorrugated steel webcantilever castingasynchronous constructionstressgeometryfinite element method
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