| In recent years, with the continuous development of economy and traffic construction, Large-span PC Continuous Rigid Frame bridge with its fine structure performance has been widely applied in engineering construction in China. But quite amount of cracks are found during the construction and operation in the PC box girder bridges, especially cracks in the anchorage zone and the inclined cracks in the box girder webs of the bridges, and some cracks appear indeed in the deadweight phases. Moreover the craze of concrete brings severe nonlinear problem of the material. In order to probe into Large-span PC Continuous Rigid-frame Box Girder Bridge cracking mechanism of crack on the box girder near the prestressed anchorage and take effective prevention and control measures, this article relies on the Cangxi Jialingjiang River extra large bridge main bridge of Continuous Rigid-frame, using Finite Element procedure for PC Continuous Rigid-Frame bridge calculation of the stress and crack analysis. This paper mainly studies include:(1) Firstly, the development of large-span PC Continuous Rigid Frame Bridge and current research status of box beam crack are introduced in this article. And based on the analyses of the formation causes of concrete cracks, this research analyses the reason of cracks in the box girder near the tooth block anchored zone especially.(2) The article introduces the stress calculation and analysis method of box girder.And on the basis of Cangxi Jialingjiang River Bridge, the whole structure is analysed by the establishment of finite element model as a whole. Then through the establishment of local finite element model, the article analysis stress distribution in the box girder near the tooth block anchored zone, and focus on research effects on bottom the tooth block cracks by bottom longitudinal reinforcement. In the end, the research gives several advice of the prevention of crack in box girder near the tooth block anchored zone. |
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