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Structural Engineering and Mechanics
  Volume 27, Number 6, December10 2007, pages 651-670

After-fracture redundancy in simple span two-girder steel bridge
Yong-Myung Park, Woom-Do-Ji Joe, Min-Oh Hwang and Tae-Yang Yoon

    An experimental study to evaluate a redundancy capacity in simple span two plate-girder bridges, which are generally classified as a non-redundant load path structure, has been performed under the condition that one of the two girders is seriously damaged. The bottom lateral bracing was selected as an experimental parameter and two 1/5-scale bridge specimens with and without bottom lateral bracing have been prepared. The loading tests were first performed on the intact specimens without cracked girder within elastic range. Thereafter, the ultimate loading tests were conducted on the damaged specimens with an induced crack at the center of a girder. The test results showed that the cross beams and concrete deck redistributed partly the applied load to the uncracked girder, but the lateral bracing system played a significant role of the load redistribution when a girder was damaged. The redundancy was evaluated based on the test results and an appropriate redundancy level was evaluated when the lateral bracing was provided in a seriously damaged simple span two-girder steel bridge.
Key Words
    redundancy; simple span two-girder bridge; bottom lateral bracing; fractured girder; load redistribution.
Yong-Myung Park and Woom-Do-Ji Joe; Department of Civil Engineering, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea
Min-Oh Hwang and Tae-Yang Yoon; Civil Engineering Research Team, Research Institute of Industrial Science and Technology, 79-5 Youngcheon, Dongtan, Hwaseong, Gyeonggi-do 445-813, Korea

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