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Techno Press

Steel and Composite Structures   Volume 29, Number 4, November25 2018, pages 437-456
Parameters influencing redundancy of twin steel box-girder bridges
Janghwan Kim, Seong-Hoon Kee, Heejung Youn and Dae Young Kim

Abstract     [Full Text]
    A bridge comprising of two girders, such as a twin steel box-girder bridge, is classified as fracture critical (i.e., nonredundant). 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.
Key Words
    bridge safety; redundancy; ultimate capacity; bridge collapse; composite bridge
(1) Janghwan Kim:
Dealim Industrial Corporation Ltd., Seoul 03152, Republic of Korea;
(2) Seong-Hoon Kee:
Department of Architectural Engineering, Dong-A University, Busan 121-791, Republic of Korea;
(3) Heejung Youn:
Department of Civil Engineering, Hongik University, Seoul 04066, Republic of Korea;
(4) Dae Young Kim:
Department of Architectural Engineering, Pusan National University, Busan 130-743, Republic of Korea.

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