Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (3): 127-131.

• Architecture & Civil Engineering • Previous Articles     Next Articles

Section Deformation of Flat Hollow Steel Box Girder of Cable-Stayed Bridge During Cantilever Erection

Xu Jin-yong1  Yan Quan-sheng2  wang Wei-feng2  Han Da-jian1   

  1. 1. School of Architecture and Civil Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;2. School of Traffic and communications , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2006-09-18 Online:2007-03-25 Published:2007-03-25
  • Contact: 徐金勇(1978-)，男，博士生，主要从事大跨度斜拉桥施工控制及极限承载力的研究。 E-mail:celxu@163.com
  • About author:徐金勇(1978-)，男，博士生，主要从事大跨度斜拉桥施工控制及极限承载力的研究。

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Abstract:

The Zhanjiang Bay bridge with a main span of 480 m is a two-pylon cable-stayed .bridge with spatial double-cable planes and hybrid girders. The steel girder of the bridge is flat hollow streamline steel box girder with truss-form diaphragms and intemal webs. As the loads on the segment being lifted differ from those on the segment supporting the crane , the two segment splices are of various section deformations during the cantilever erection. In order to reveal the relative deformation of box girder sections during the cantilever erection , the 3D finite element models of the segment being lifted and supporting the crane are established via the mixed element method. The in-fluences of several parameters including the truss stiffness on the deformation are then analyzed. The results indicate that the flat hollow steel box girder with truss-form diaphragms and intemal webs is feasible to long-span cable-stayed bridges , and that the relative deformation of the box girder is govemed by the transverse location of crane-acting
point and the global stiffness of the steel box girder.

Key words: cable-stayed bridge, flat hollow steel box girder, section deformation, finite element model