Design flaws on supporting girders of a pedestrian bridge under construction at Wake Technical Community College in Raleigh, N.C., led to a collapse that killed one worker and injured four others, according to the North Carolina Department of Labor (DOL).
Workers were pouring concrete for the bridge deck when it collapsed in November 2014. A second bridge being constructed nearby collapsed hours later, but no one was hurt.
The report concluded notches in the girders were designed poorly, which prevented both bridges from being able to carry the weight of the structures.
The DOL says Stewart Engineering, the firm hired to design the bridge, should have noticed the design flaws while preparing the drawings for the bridge.
No citations will be issued to any of the companies involved due to a lack of applicable regulations in regards to bridge design.