Miami Pedestrian Bridge Collapse: Computational Forensic Analysis
Publication: Journal of Bridge Engineering
Volume 25, Issue 1
Abstract
On March 15, 2018, a pedestrian concrete truss bridge in Miami, Florida, collapsed during construction. The failure of this bridge caused multiple casualties and raised many serious concerns regarding the design and construction of the bridge, including the emerging concept of accelerated bridge construction (ABC). The causes of failure of this bridge have not yet been comprehensively investigated. This paper used high-fidelity computational simulation to investigate the behavior of critical structural members of the bridge during construction. Four important construction stages (prestressing, transportation, relocation, and retensioning) were simulated to identify dominant factors that could have contributed to the failure of the bridge. A recent investigation report from the National Transportation Safety Board (NTSB) attributed the collapse to flawed design at the failed joint at the northern end of the bridge, but the specific sequence of mechanisms that led to collapse was not identified. Based on simulation and demand/capacity analysis, this work shows that the horizontal component of the retensioning force overcame the resistance of the joint and caused it to slide with respect to the deck. As sliding progressed, dowel action between the deck and joint became fully mobilized, crushing and damaging concrete locally within the joint and the deck. The evolving damage (to the cold joint and adjacent joint and deck concrete) prompted more sliding and led to a vicious cycle that culminated in the collapse of the entire bridge. Parametric studies investigated the effects of the coefficient of friction at the cold joint, prestressing forces in the deck, and retensioning forces applied to the northern diagonal member on the collapse behavior of the bridge. The results from the analysis and simulations provide important insights into the collapse mechanism and highlight lessons that could be learned for preventing similar catastrophic failures in the future.
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Data Availability Statement
Some data, models, or code generated or used during the study are available from the corresponding author by request. Some data, models, or code generated or used during the study are proprietary or confidential in nature and may only be provided with restrictions.
Acknowledgments
The authors thank Mohammad Ayub from the Occupational Safety and Health Administration (OSHA) for his constructive comments that improved this manuscript. This research was supported, in part, by National Science Foundation Grant Nos. CNS-0958379, CNS-0855217, and ACI-1126113 and by the City University of New York High-Performance Computing Center at the College of Staten Island. This study also was partially supported by the INSPIRE University Transportation Center (UTC). Financial support for INSPIRE UTC projects is provided by the US Department of Transportation, Office of the Assistant Secretary for Research and Technology (USDOT/OST-R) under Grant No. 69A3551747126 through INSPIRE University Transportation Center (http://inspire-utc.mst.edu) at Missouri University of Science and Technology. Any opinions, findings and conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the OSHA, the National Science Foundation, the USDOT/OST-R, or any State or other entity.
References
AASHTO. 2017. AASHTO LRFD bridge design specifications. 8th ed. Washington, DC: AASHTO.
ACI (American Concrete Institute). 2011. Building code requirements for structural concrete (318-11) and commentary-(318R-11). ACI 318-11. Detroit: ACI.
AISC. 2010. Specification for structural steel buildings. ANSI/AISC 360-10. Chicago: AISC.
Ayub, M. 2019. Investigation of March 15, 2018 pedestrian bridge collapse at Florida International University, Miami, FL. Washington, DC: US Dept. of Labor, Occupational Safety and Health Administration.
Berman, J. W., B.-S. Wang, A. W. Olson, C. W. Roeder, and D. E. Lehman. 2012. “Rapid assessment of gusset plate safety in steel truss bridges.” J. Bridge Eng. 17 (2): 221–231. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000246.
Cao, R., A. K. Agrawal, S. El-Tawil, X. Xu, and W. Wong. 2019a. “Heavy truck collision with bridge piers: A computational simulation study.” J. Bridge Eng. 24 (6): 04019052. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001398.
Cao, R., A. K. Agrawal, S. El-Tawil, X. Xu, and W. Wong. 2019b. “Performance-based design framework for bridge piers subjected to truck collision.” J. Bridge Eng. 24 (7): 04019064. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001423.
Cao, R., S. El-Tawil, A. K. Agrawal, X. Xu, and W. Wong. 2019c. “Behavior and design of bridge piers subjected to heavy truck collision.” J. Bridge Eng. 24 (7): 04019057. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001414.
Do, T. V., T. M. Pham, and H. Hao. 2018. “Numerical investigation of the behavior of precast concrete segmental columns subjected to vehicle collision.” Eng. Struct. 156 (Feb): 375–393. https://doi.org/10.1016/j.engstruct.2017.11.033.
FIU (Florida International University). 2017a. “R.F.C. superstructure plan.” Miami: FIU. Accessed January 22, 2019. http://facilities.fiu.edu/projects/BT_904/PRR/PlanFiles.zip.
FIU (Florida International University). 2017b. “UniversityCity prosperity project pedestrian bridge: Superstructure, final design calculations.” Miami: FIU. Accessed January 22, 2019. http://facilities.fiu.edu/projects/BT_904/PRR/Calculations.zip.
FIU (Florida International University). 2018. “Time lapse videos.” BT-904 UniversityCity prosperity project PRR webpage (online archive). Accessed January 22, 2019. http://facilities.fiu.edu/projects/BT_904/PRR/time_lapse_videos.zip.
FIU (Florida International University), Facilities Management. 2019. “BT-904 records readily available.” BT-904 UniversityCity Prosperity Project PRR WebPage (online archive). Accessed January 22, 2019. https://facilities.fiu.edu/projects/BT-904-PRR.htm.
Hallquist, J. O. 2006. Vol. 3 of LS-DYNA theory manual, 25–31. Livermore, CA: Livermore Software Technology.
Hao, S. 2010. “I-35W bridge collapse.” J. Bridge Eng. 15 (5): 608–614. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000090.
Jiang, H., and M. G. Chorzepa. 2015. “An effective numerical simulation methodology to predict the impact response of pre-stressed concrete members.” Eng. Fail. Anal. 55 (Sep): 63–78. https://doi.org/10.1016/j.engfailanal.2015.05.006.
Jung, K.-H., J.-W. Yi, and J.-H. J. Kim. 2010. “Structural safety and serviceability evaluations of prestressed concrete hybrid bridge girders with corrugated or steel truss web members.” Eng. Struct. 32 (12): 3866–3878. https://doi.org/10.1016/j.engstruct.2010.08.029.
Liu, G. 2012. “Behavior of bridge piers during vehicular impacts.” Ph.D. thesis, City College of New York, City Univ. of New York.
Moutoussamy, L., G. Herve, and F. Barbier. 2011. “Qualification of *Constrained_Lagrange_In_Solid command for steel/concrete interface modeling.” In Proc., 8th European LS-Dyna Conf. San Francisco: LS-DYNA.
Murray, Y. D., A. Y. Abu-Odeh, and R. P. Bligh. 2007. Evaluation of LS-DYNA concrete material model 159.. Washington, DC: Federal Highway Administration.
Nakalswamy, K. K. 2010. “Experimental and numerical analysis of structures with bolted joints subjected to impact load.” Ph.D. thesis, Dept. of Mechanical Engineering, Univ. of Nevada, Las Vegas.
NTSB (National Transportation Safety Board). 2008. Collapse of I-35W highway bridge, Minneapolis, Minnesota, August 1, 2007. Washington, DC: Createspace Independent Publishing.
NTSB (National Transportation Safety Board). 2018a. “Investigative update 1 (Aug. 09, 2018): Collapse of pedestrian bridge under construction Miami, Florida (HWY18MH009).” Accessed January 22, 2019. https://www.ntsb.gov/investigations/AccidentReports/Reports/HWY18MH009-investigative-update.pdf.
NTSB (National Transportation Safety Board). 2018b. “Investigative update 2 (Nov. 15, 2018): Collapse of pedestrian bridge under construction Miami, Florida (HWY18MH009).” Accessed January 22, 2019. https://www.ntsb.gov/investigations/AccidentReports/Reports/HWY18MH009-investigative-update2.pdf.
NTSB (National Transportation Safety Board). 2018c. “Preliminary report: Highway: Collapse of pedestrian bridge under construction Miami, Florida (HWY18MH009).” Accessed January 22, 2019. https://www.ntsb.gov/investigations/AccidentReports/Reports/HWY18MH009-prelim.pdf.
NTSB (National Transportation Safety Board). 2019a. “NTSB B-roll of Miami, FL bridge collapse.” Accessed January 22, 2019. https://www.youtube.com/watch?v=aeJKqojmHgY.
NTSB (National Transportation Safety Board). 2019b. “National Transportation Safety Board public meeting of October 22, 2019.” Accessed October 28, 2019. https://www.ntsb.gov/news/events/Documents/2019-HWY18MH009-BMG-abstract.pdf.
Xu, X., R. Cao, S. El-Tawil, A. K. Agrawal, and W. Wong. 2019. “Loading definition and design of bridge piers impacted by medium weight trucks.” J. Bridge Eng. 24 (6): 04019042. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001397.
Xue, D., Y. Liu, J. He, and B. Ma. 2011. “Experimental study and numerical analysis of a composite truss joint.” J. Constr. Steel Res. 67 (6): 957–964. https://doi.org/10.1016/j.jcsr.2011.01.013.
Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 25 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 1, 2019
Accepted: Oct 7, 2019
Published online: Nov 7, 2019
Published in print: Jan 1, 2020
Discussion open until: Apr 7, 2020
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