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《Journal of Chongqing Jiaotong University(Natural Science)》 2010-03
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Local Force Analysis of Steel-Box Girder Bridge with Incremental Launching Construction by Vertical Curve of Variable Curvature

ZHOU Ye-fei1,GONG Jing-min2(1.Shenzhen Traffic Construction Engineering Test & Detection Centre,Shenzhen 518049,Guangdong,China;2.Hunan Communication Polytechnic,Changsha 410004,Hunan,China)  
The non-stress alignment of present long-span steel box girder bridges is generally a single radius of vertical curve.The non-stress alignment of steel box girder of Hangzhou Jiangdong Bridge is a continous variablely curved vertical curve.The feature of variable curvature not only changes the incremental launching radius of vertical curve,but also makes the displacement of steel box girder at slide path corner obvious.Therefore,the new requirement to construct the incremental launching slide path is put forward: the alignment of rubber surface should automatically adapt to the changes of grider.The security of steel box girder forcing is essential to the success of the incremental launching.3D finite element analysis on local steel box girder of the slide path is carried out by ANSYS,and stress distributions of various components of steel box girder under seven typical operation conditions are comparied.The analysis draws a conclusion that the counterforce of temporary pier and the corner displacement of the steel box girder on the slide are critical factors to affect the local stress of the steel box girder.
【CateGory Index】: U441
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