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Investigation of collapse of Florida International University (FIU) pedestrian bridge
Highlights Collapse of Florida International University pedestrian bridge was investigated. Relevant photo clearly showing the collapse cite was summarized and selected. Initial cracking and re-tension operation were the major reason.
Abstract The collapse of main span of Florida International University (FIU) pedestrian bridge occurred on March 15, 2018 attracted wide attention globally. This paper summarized and selected highly relevant in-site photos of the collapsed bridge, carried out in-depth comparison and FE assessment. The authors discussed the initial crushed region in the concrete truss girder and concluded the reason of the accident. Firstly an investigation based on available photos, videos and other resources eliminated the possibility of failure in the joints and members including 9-10-deck, 10-11-canopy, 12-canopy, 11th member and the deck wherein. Secondly, FE numerical simulation showed, due to the difference on temporary hinges assigned on both ends of 1st member and 12th member, unwanted excessive bending moment appeared in the lower end of 11th and 12th members due to self-weight of the girder in simple-supported state after its placement finished. Resulted greater stress than tensile strength of concrete caused visible initial cracking. The re-tension operation on prestressing rods per the bridge design plans produced additional loading on the diagonal members and thus shear failure of 11-12-deck joint along the penetrated cracking on lower side of 11-deck joint, which was demonstrated by FE model employed by the initial cracking with the pattern shown in NTSB’s investigation report.
Investigation of collapse of Florida International University (FIU) pedestrian bridge
Highlights Collapse of Florida International University pedestrian bridge was investigated. Relevant photo clearly showing the collapse cite was summarized and selected. Initial cracking and re-tension operation were the major reason.
Abstract The collapse of main span of Florida International University (FIU) pedestrian bridge occurred on March 15, 2018 attracted wide attention globally. This paper summarized and selected highly relevant in-site photos of the collapsed bridge, carried out in-depth comparison and FE assessment. The authors discussed the initial crushed region in the concrete truss girder and concluded the reason of the accident. Firstly an investigation based on available photos, videos and other resources eliminated the possibility of failure in the joints and members including 9-10-deck, 10-11-canopy, 12-canopy, 11th member and the deck wherein. Secondly, FE numerical simulation showed, due to the difference on temporary hinges assigned on both ends of 1st member and 12th member, unwanted excessive bending moment appeared in the lower end of 11th and 12th members due to self-weight of the girder in simple-supported state after its placement finished. Resulted greater stress than tensile strength of concrete caused visible initial cracking. The re-tension operation on prestressing rods per the bridge design plans produced additional loading on the diagonal members and thus shear failure of 11-12-deck joint along the penetrated cracking on lower side of 11-deck joint, which was demonstrated by FE model employed by the initial cracking with the pattern shown in NTSB’s investigation report.
Investigation of collapse of Florida International University (FIU) pedestrian bridge
Zhou, Xuhong (author) / Di, Jin (author) / Tu, Xi (author)
Engineering Structures ; 200
2019-10-01
Article (Journal)
Electronic Resource
English
FIU pedestrian bridge , Collapse , Investigation , ABC , Design , Construction , Concrete
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