The roof of a two-story office building collapsed during a severe rainstorm. The impact from the collapsing roof progressively caused the second floor to also collapse onto the first floor…

This case involved a building which had been recently converted from a gas station into a café. A 2 inch rainfall occurred shortly after the conversion was completed, and caused…

The roof at a water park facility attached to a resort collapsed overnight under negligible environmental loads, and after ten years of service. The structure had been in use the…

On April 17, 2013, an explosion at the West Fertilizer Company in West, Texas rocked the city and surrounding rural areas. The explosion left a crater 93′ wide and 10′…

Nelson’s rapid-response teams have evaluated hundreds of buildings following tornado events nationwide. Often working alongside emergency response personnel, Nelson’s engineers have assessed the safety of affected buildings, determined the extent…

While roof collapses are not uncommon, this case was unique, as the steel joist roof framing collapsed along the entire 900 foot length of one perimeter wall. Nelson’s engineers responded immediately,…

Within a few years of completion of this post-tensioned concrete parking garage, multiple failures of the tendons occurred, compromising the structural integrity of the garage. Nelson performed a structural evaluation…

On August 29, 2005, Hurricane Katrina ravaged the city of New Orleans, causing wind damage and major flooding. Nelson evaluated flood damage to scores of residential buildings affected by the…

The 83,000 square foot steel-framed membrane-envelope building housed a full-size football field and observation areas; and it collapsed during a windstorm with maximum wind speeds of 55 mph. Nelson’s team…

A two-span pedestrian bridge which connected the second floor of a shopping mall with the adjacent parking garage collapsed. The bridge was constructed of wide-flange steel fascia girders, transverse floor…