Steel and Composite Structures

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Parameters influencing redundancy of twin steel box-girder bridges

  • Kim, Janghwan (Dealim Industrial Corporation Ltd.) ;
  • Kee, Seong-Hoon (Department of Architectural Engineering, Dong-A University) ;
  • Youn, Heejung (Department of Civil Engineering, Hongik University) ;
  • Kim, Dae Young (Department of Architectural Engineering, Pusan National University)
  • Received : 2017.12.27
  • Accepted : 2018.11.08
  • Published : 2018.11.25
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Abstract

A bridge comprising of two girders, such as a twin steel box-girder bridge, is classified as fracture critical (i.e., non-redundant). In this study, the various bridge components of the twin steel box-girder bridge are investigated to determine if these could be utilized to improve bridge redundancy. Detailed finite-element (FE) models, capable of simulating prominent failure modes observed in a full-scale bridge fracture test, are utilized to evaluate the contributions of the bridge components on the ultimate behavior and redundancy of the bridge sustaining a fracture on one of its girders. The FE models incorporate material nonlinearities of the steel and concrete members, and are capable of capturing the effects of the stud connection failure and railing contact. Analysis results show that the increased tensile strength of the stud connection and (or) concrete strength are effective in improving bridge redundancy. By modulating these factors, redundancy could be significantly enhanced to the extent that the bridge may be excluded from its fracture critical designation.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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