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Mathematical Problems in Engineering
Volume 2015, Article ID 105024, 14 pages
http://dx.doi.org/10.1155/2015/105024
Research Article

Structural Optimization of Steel Cantilever Used in Concrete Box Girder Bridge Widening

1Faculty of Infrastructure Engineering, Bridge Science Research Institute, Dalian University of Technology, Dalian, Liaoning 116024, China
2School of Energy and Power Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China

Received 3 April 2015; Revised 11 June 2015; Accepted 21 June 2015

Academic Editor: Zdeněk Kala

Copyright © 2015 Qian Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The structural optimization method of steel cantilever used in concrete box girder bridge widening is illustrated in this paper. The structural optimization method of steel cantilever incorporates the conceptual layout design of steel cantilever beam based on the topological theory and the determination of the optimal location of the transverse external prestressed tendons which connect the steel cantilever and the box girder. The optimal design theory and the analysis process are illustrated. The mechanical model for the prestressed steel cantilever is built and the analytical expression of the optimal position of the transverse external tendon is deduced. At last the effectiveness of this method is demonstrated by the design of steel cantilevers which are used to widen an existing bridge.