The new European data protection law requires us to inform you of the following before you use our website: We use cookies and other technologies to customize your experience, perform analytics and deliver personalized advertising on our sites, apps and newsletters and across the Internet based on your interests. The NTSB similarly asked the FHWA to examine the design of the bridge. They also confirmed workers were adjusting rod tension when the collapse occurred. [12][27] The bridge's main span was assembled adjacent to the highway using accelerated bridge construction. A specification change from FDOT late in the planning phase required relocating central pier 11 feet (3 meters) north to allow for future widening of the highway, causing some changes in construction. The reason for this change in oscillation is still debated, but one of the best suggestions has has to do with the aerodynamics of the bridge. [11] The bridge cost $9 million to construct, exclusive of the installation cost. A final NTSB public hearing on the bridge accident was held October 22, 2019, in Washington, D.C., and concluded "that load and capacity calculation errors made by FIGG Bridge Engineers, Inc., are the probable cause of the fatal, March 15, 2018, Florida International University pedestrian bridge collapse in Miami." These days, we have a much better understanding of the wide variety of loading conditions that can be faced by buildings and other structures.

The transcription is below ... : "Hey Tom, this is Denney Pate with FIGG bridge engineers. #WorldsAheadpic.twitter.com/lQVJh09Pv2", "Key design change stymied bridge cost, schedule", "FIU, Sweetwater break ground for bridge to the future", "Community gathers to watch 950-ton bridge move across Southwest 8th Street", "If you plan to drive on SW Eighth Street this weekend, you'll be rerouted here", "Investigators Explain Focus On Pre-Collapse Cracking In Florida Bridge", "Engineer advised of cracking on bridge two days before collapse", "Bridge collapse victim's uncle rages at 'incompetence, "FIU employee heard a loud crack crossing under the bridge.

"[57], On March 19, 2018, the first civil lawsuit was filed against FIGG Bridge Engineers, MCM, Bolton Perez & Associates, the project's consulting engineer, Louis Berger, and Network Engineering Services for reckless negligence. In July 1940, the Tacoma Narrows bridge opened to traffic between Tacoma, Washington and the Kitsap Peninsula. The main roadway-crossing span was 175 ft long, and the shorter canal span was to be 99 ft long. Pedestrian use was to begin when the entire project was complete.The section of the bridge that collapsed weighed 950 short tons (860 metric tons) and fell onto several vehicles on the roadway below. [34] At the same time, the design-build team met for about two hours at the construction site to discuss the cracks discovered on March 13. [14][15] The National Transportation Safety Board, however, found that with respect to the bridge, "F.I.U. To that end, I’ve put together a list of the 10 Washington state suspension bridge hikes that I want to do in 2019. Actual location is an opposite side of Southwest 109th Avenue, Accelerated Bridge Construction, University Transportation Center, School of Hospitality & Tourism Management, Robert Stempel College of Public Health and Social Work, Food Network South Beach Wine and Food Festival, https://en.wikipedia.org/w/index.php?title=Florida_International_University_pedestrian_bridge_collapse&oldid=981674132, Construction accidents in the United States, Articles with unsourced statements from October 2020, Articles with unsourced statements from February 2020, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 October 2020, at 19:25. About 45 minutes before failure, a different kind of oscillation started. Financing construction of the bridge was a major obstacle, which led the state to pursue an innovative design. [58], On March 21, 2018, U.S. Transportation Secretary Elaine Chao asked the department's inspector general to probe whether the federally funded pedestrian bridge complied with all rules. And for so many years, there was one force with which bridge engineers had to contend: gravity. A bridge is a quintessential civil structure. October 5, 2019 at 9:48 PM EDT At least six people were injured Saturday when a small pedestrian bridge collapsed in Frederick County, Md., at the site of … At the time, it was the third-longest suspension bridge in the world. Hey I’m Grady and this is Practical Engineering.

It happened around 3:45 p.m. … This content is currently not available in your region. I cut a slot in my model, and sure enough the vibrations almost completely stopped.

You might notice small devices hanging near the insulators at each pole. Thank you. Thank you for watching, and let me know what you think. The bridge was a post-tensioned concrete structure. [62] On May 3, 2018, a lawyer for the NTSB wrote a letter to Judge Cooper of the 2nd Judicial Circuit of Florida in Tallahassee urging the court to deny a ruling that would favor the Miami Herald plaintiff, for the release of any bridge information generated after a February 19, 2018, cutoff date. The main lesson isn’t necessarily that you should make sure to consider aeroelastic effect when you design a suspension bridge (even though you definitely always should), but I think more importantly it’s a reminder of how profoundly capable we are of making mistakes. [32] The National Transportation Safety Board, who investigated the collapse, stated that crews were applying "post-tensioning force" on the bridge before the collapse. On October 8, 2019, the NTSB released over 6,000 pages relating to its investigation of the collapse, including letters submitted to the NTSB by the various companies associated with the bridge construction. [24] The bridge was made using a new formulation for concrete intended to stay cleaner than standard concrete formulations. One of the most fundamental jobs of an engineer is to compare loading conditions to strengths. [26], Construction of the bridge began in March 2016 and was scheduled to be completed in December 2018. [4] The National Transportation Safety Board (NTSB) issued a "News Release"[5] which said, "load and capacity calculation errors made by FIGG Bridge Engineers, Inc., are the probable cause of the fatal ... bridge collapse in Miami ..." The same day the NTSB released a "synopsis"[note 1] of its final report, which stated, ... that the probable cause of the Florida International University (FIU) pedestrian bridge collapse was the load and capacity calculation errors made by FIGG Bridge Engineers, Inc., (FIGG) in its design of the main span truss member 11/12 nodal region and connection to the bridge deck. Buildings and other structures face a huge variety of loads, including floods, snow, rain, ice, earthquakes, and crowds of people. [17] This reduced the number of steps to climb. [23] The concrete walkway deck was to act as the horizontal bottom flange of a wide I-beam, and the concrete roof canopy was to function as the horizontal top flange of the I-beam. Watch the amazing "Gallopin' Gertie" November 7, 1940 film clip. [17][20][21] The bridge spans used a novel concrete truss design invented for this project, a "re-invented I-beam concept". Even during construction, it was apparent that the bridge was too flexible even under moderate winds. Please enable cookies on your web browser in order to continue.

See our, Read a limited number of articles each month, You consent to the use of cookies and tracking by us and third parties to provide you with personalized ads, Unlimited access to washingtonpost.com on any device, Unlimited access to all Washington Post apps, No on-site advertising or third-party ad tracking. [12], The main companies behind the construction project were Munilla Construction Management (MCM), a Miami-based construction management firm, and FIGG Bridge Engineers, a Tallahassee-based firm. [50] Also on March 16, 2018, the FDOT released a letter to the public with information about the bridge collapse: According to standard procedures, FDOT issued a permit at the request of FIU's design build team to close SW 8th Street during the installation of the FIU pedestrian bridge on Saturday, March 10. NTSB staff is currently making final revisions to the report ... which ... will be distributed ... as soon as possible. Bye.".

Rather than a truss through which wind can flow, this shape of the Tacoma Narrows Bridge with the large steel plates on either side created some strange interactions with the wind. The case of the Tacoma Narrows bridge is a well-known cautionary tale that’s discussed in engineering and physics classrooms across the world.

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