PITTSBURGH (AP) 鈥 Investigators looking into the collapse of a Pittsburgh bridge nearly one year ago are looking closely at damage to the legs of the structure, the 香港六合彩挂牌资料 Transportation Safety Board said Thursday.
An on the said its engineers are examining 鈥渕ultiple fractures鈥 found on the bridge's legs. All four legs have been scanned to enable further analysis.
The span dropped a bus and four cars some 100 feet (30 meters) into a ravine, injuring several people hours before President Joe Biden visited the city to promote a massive infrastructure law. The span carried Forbes Avenue over Frick Park, Fern Hollow Creek and Tranquil Trail.
A last month after design and construction were fast-tracked.
The update says that in addition to making 3D scans of portions of the collapsed bridge and assembling documentation, they have also been conducting mechanical and metallurgical tests that will soon be complete.
Results will be compared to specifications from the bridge鈥檚 original design.
A issued a year ago concluded the collapse began at the structure鈥檚 west end and said there had been no primary fractures in sections of welded steel girders considered 鈥渇racture critical.鈥
