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Advances in Concrete Construction
  Volume 3, Number 4, December 2015 , pages 295-316

Bridge widening with composite steel-concrete girders: application and analysis of live load distribution
Yue Yang, Xiaoguang Zhang, Jiansheng Fan and Yu Bai

    A bridge widening technology using steel-concrete composite system was developed and is presented in this paper. The widened superstructure system consists of a newly built composite steel-concrete girder with concrete deck and steel diaphragms attached to the existing concrete girders. This method has been applied in several bridge widening projects in China, and one of those projects is presented in detail. Due to the higher stiffness-to-weight ratio and the rapid erection of composite girders, this widening method reveals benefits in both mechanical performance and construction. As only a few methods for the design of bridges with different types of girders are recommended in current design codes, a more accurate analytical method of estimating live load distribution on girder bridges was developed. In the analytical model, the effects of span length, girder pacing, diaphragms, concrete decks were considered, as well as the torsional and flexural stiffness of both composite box girders and concrete T girders. The study shows that the AASHTO LRFD specification procedures and the analytical models proposed in this paper closely approximate the live load distribution factors determined by finite element analysis. A parametric study was also conducted using the finite element method to evaluate the potential load carrying capacities of the existing concrete girders after widening.
Key Words
    bridge widening; composite girder; distribution factor; field test; finite element analysis
Yue Yang, Xiaoguang Zhang, Jiansheng Fan: Department of Civil Engineering, Tsinghua University, Beijing, 100084, China
Yu Bai: Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia

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