An innovative pedestrian bridge being built at Florida International University was put to a “stress test” before it collapsed Thursday over traffic, killing six people and sending 10 to a hospital, authorities said.
The death toll rose by two on Friday morning.
As state and federal investigators worked to determine how and why the five-day-old span failed, one factor may have been the stress test that Miami-Dade Mayor Carlos Gimenez said crews were conducting on the span. Two workers were on the 862-tonne bridge when it pancaked on top of vehicles waiting at a stoplight.
First responders had been racing to find survivors in the rubble of the 53-metre span using high-tech listening devices, trained sniffing dogs and search cameras before turning the scene over to police.
“This has turned from a rescue to a recovery operation,” Miami-Dade police Det. Alvaro Zabaleta said.
The $ 14.2-million pedestrian bridge was supposed to open in 2019 as a safe way to cross a busy six-lane road between the university campus and the community of Sweetwater. The bridge is located in the Southwest 109th Avenue area, where the FIU’s Modesto A. Maidique campus is located, and where 4,000 students live.
‘One-of-a-kind engineering design’
Florida Gov. Rick Scott and U.S. Sen. Marco Rubio joined other authorities at the scene. Rubio said the public and the families of the dead and injured deserve to know “what went wrong.”
Scott added an investigation will get to the bottom of “why this happened and what happened,” and that if anyone did anything wrong, “we will hold them accountable.”
National Transportation Safety Board chair Robert Sumwalt III said a team of specialists would begin its investigation Friday morning.
The death toll from the collapse rose to six from four on Friday morning. (Joe Skipper/Reuters)
Rubio, an adjunct professor at the school, which has several campuses in the Miami area, noted the pedestrian bridge was intended to be an innovative and “one-of-a-kind engineering design.”
Renderings showed a tall, off-centre tower with supporting cables attached to the walkway. When the bridge collapsed, the main tower had not yet been installed, and it was unclear what builders were using as temporary supports.
Firm promises ‘full investigation’
An accelerated construction method was supposed to reduce risks to workers and pedestrians and minimize traffic disruption, the university said. The school has long been interested in this kind of bridge design; in 2010, it opened an Accelerated Bridge Construction Center to “provide the transportation industry with the tools needed to effectively and economically utilize the principles of ABC to enhance mobility and safety, and produce safe, environmentally friendly, long-lasting bridges.”
The project was a collaboration between MCM Construction, a Miami-based contractor, and Figg Bridge Design, based in Tallahassee. Figg is responsible for the iconic Sunshine Skyway Bridge across Tampa Bay.
Figg’s statement Thursday said the company was “stunned” by the collapse and would cooperate with investigations.
“In our 40-year history, nothing like this has ever happened before,” the statement said. “Our entire team mourns the loss of life and injuries associated with this devastating tragedy, and our prayers go out to all involved.”
MCM Construction Management promised on its Facebook page to participate in “a full investigation to determine exactly what went wrong.”
Bridge put in place last weekend
Robert Bea, a professor of engineering and construction management at the University of California, Berkeley, said it was too early to know exactly what happened, but the decision to use what the bridge builders called an “innovative installation” over a heavily traveled thoroughfare was risky.
“Innovations take a design firm into an area where they don’t have applicable experience, and then we have another unexpected failure on our hands,” Bea said after reviewing the bridge’s design and photos of the collapse.
The FIU community, along with Sweetwater and county officials, held a “bridge watch party” last Saturday. That’s when the span was lifted from its temporary supports, rotated 90 degrees across an eight-lane thoroughfare and lowered into its permanent position over the busy road.
FIU President Mark Rosenberg said tests were being done on Thursday. Authorities said two construction workers were on the bridge when it collapsed; it’s unclear what the tests were or if they contributed to the failure.
“This bridge was about goodness, not sadness,” Rosenberg said. “Now we’re feeling immense sadness, uncontrollable sadness. And our hearts go out to all those affected, their friends and their families. We’re committed to assist in all efforts necessary, and our hope is that this sadness can galvanize the entire community to stay the course, a course of goodness, of hope, of opportunity.”
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