Six Dead In Florida Pedestrian Bridge Collapse

 

 

Authorities say six people have died after a 960-ton span of a pedestrian bridge collapsed on Thursday, onto a busy street below, killing six motorists under an avalanche of concrete and metal. At least nine others were injured in the collapse of the nearly 200-foot-long bridge, which was under construction near the campus of Florida International University. The bridge, which was still being installed at the time of the collapse, was built to connect Florida International University with downtown Sweetwater, where many students live. The bridge was not scheduled to open until 2019.

Senator Marco Rubio said suspension cables on the bridge “were being tightened when it collapsed.” Police are enlisting the help of engineers as they investigate the cause of the collapse. The National Transportation Safety Board, Miami-Dade homicide detectives and prosecutors are focusing on the government agencies and two contractors — Munilla Construction Management, which was building the structure, and FIGG Bridge Group, which engineered and designed the span.

A lead engineer with the private contractor FIGG Bridge Engineers -who constructed the bridge, left a voice mail for a state transportation official warning of “some cracking observed on the north end of the span” two days before the structure collapsed. In the message, which was not retrieved until Friday, the engineer said he did not consider the crack a safety issue. The Florida Department of Transportation official to whom the voice mail was directed was out of the office on assignment. Footage of the collapse, taken from a vehicle dashcam, suggests the concrete came apart on the north end — the same area that the bridge’s design engineer spoke about in the message.

On Thursday, shortly before the bridge collapsed, a meeting was held regarding the crack that appeared on the structure. The university said that the meeting was convened by FIGG and Munilla Construction Management (MCM), which built the bridge. “The FIGG engineer of record delivered a technical presentation regarding the crack and concluded that there were no safety concerns and the crack did not compromise the structural integrity of the bridge,” the university said in a statement, adding that representatives of the school and the state Department of Transportation attended the session, which lasted two hours.

News outlets speculating over the cause of the collapse have focused on the cracks reported but experts say other factors, including the tensioning work going on at the bridge’s north end are of more concern. They say cracking in new concrete is not uncommon and not necessarily a sign of failure. Tightening of steel cables, or tendons, that run through concrete structural elements is a delicate operation, and over-tightening can cause concrete pieces to twist and break apart, experts say.

Rescue workers dug through the rubble nonstop for two days, pulling out crushed vehicles in search of victims. All six victims were identified by Saturday morning as Florida International University student Alexa Duran, 18; Brandon Brownfield, a tower crane technician, husband and father of three; Rolando Fraga Hernandez, 60, was a systems technician at ITG

Communications; Osvaldo González, 57 and Alberto Arias, 54. Navarro Brown, 37, an employee with Structural Technologies VSL, died at a hospital shortly after the accident. Two other employees of the company were hospitalized at Kendall Regional Medical Center in Miami in stable condition.