Abstract：Research purposes : The post down-warping is a common disaster for large span concrete beam bridge, which can cause serious danger to bridge, so it is urgent to find out the main cause for down-warping for the purposes of prevention of it and finally control of down-warping.
Research methods: The explanation is given to the mechanism of causing flexure from beginning with the rigidity of beam bridge , and then the analyses are made for the impacts on post flexure by prestress effects, contracting slow change effects and crack of beam body.
Research conclusions : The shortage of availability of longitudinal and vertical stresses cause the post flexure becoming overlarge and crack of beam body and then the crack of beam body cause the rigidity of beam body becoming weak, resulting in development of post down-warping.
马润平,卫军,高宗余. 大跨预应力混凝土梁式桥后期下挠原因分析[J]. 铁道工程学报, 2007, 24(5): 51-54.
MA Run-ping, WEI Jun，GAO Zong-yu. Analysis of the Cause for Post Down-warping of Large Span Prestressed Concrete Beam Bridge. 铁道工程学报, 2007, 24(5): 51-54.
2007, Vol. 24 
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