Pre-Camber Analysis for Hanging Cradle Construction of Qinhe Bridge

Abstract:

In order to ensure the safety of long-span continuous prestressed concrete girder bridge constructed by hanging cradle method, a pre-camber is always made to reduce shrinkage and creep in the process of post-operation, the late loss of pre-stressed, deformation produced by live load and so on. Combining with Qinhe Bridge, how to install the pre-camber is studied in this paper. The maximum pre-cambers and their locations of every span of Qinhe Bridge are determined by the method of standard JTG D62-2004 with the finite element analysis software MIDAS/CIVIL. The results show that the final pre-camber curves calculated by the method of standard JTG D62-2004 and quadratic parabolic method have cusps, which cannot meet the standard requirements for the smooth of the bridge. But the slop of the final pre-camber curve calculated by cosine curve at the maximum pre-cambers and the pier top is zero, and the slop of curve from pier top to the mid-span is small, which satisfy the standard requirements for the smooth of bridge. Therefore, the final pre-camber curve should be calculated by cosine curve.

• Periodical: Applied Mechanics and Materials (Volumes 438-439)
• Pages: 923-925
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.438-439.923
• Online since: October 2013
• Authors: Ji Hao Chen, Sen Liu, Yu Jia Gao, Yong Peng Sun
• Keywords: Bridge Engineering, Cosine Curve, Final Pre-Camber, Hanging Cradle Construction, Quadratic Parabolic Curve

References

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DOI: 10.4028/www.scientific.net/amr.255-260.821