Alignment Control of Cast-in-situ Concrete Curved Beams in Soft Foundation Area of Fuli Expressway
The construction of cast-in-place concrete curved beams in the soft foundation area faces problems such as weak founda-tion bearing capacity,many uncontrollable factors,and difficulty in controlling the alignment of the bridge.Relying on the cast-in-place concrete curve beam project of the Dazong Lake Interchange C ramp bridge of Fuli Expressway,the reinforcement measures for the soft foundation in the bridge construction area were proposed.The curved beam model was established through the finite element software Midas Civil,the changing rules and influencing factors of the vertical and radial displacements of the curved beam were ana-lyzed,and construction measures for linear control of curved beams were proposed.The results show that the maximum deflection of prestressed continuous box girder caused by shrinkage creep,prestress and dead load is 2 mm,13 mm and 12.5 mm respectively,the change in prestress has the greatest influence.The plane radial displacement of the curved beam is more sensitive to the temperature effect,and the radial displacement caused by the system temperature rise reaches 14.11 mm.The monitoring of the box girder shows that the elevation deviation of the concrete box girder meets the specification requirements,and the monitoring results are in good agree-ment with the finite element simulation values.The research results can provide reference for similar projects.
expresswaysoft base areacast-in-place concrete curved beamline controlfinite element simulationon-site moni-toring
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