Examples of Forensic Investigations

Wind speed and direction at the time of failure of a power line was determined using a post incident weather analysis combined with a wind tunnel test.

Critical boom and jib positions of this crane combined with wind speed from a specific direction overturned this crane. Analysis showed the wind was just sufficient to cause the accident.

Asphalt shingle tab unseal condition and potential house frame response to high winds has been the subject of a number of investigations. Wind speeds and directions at specific house locations were determined during a hurricane.

Snow loads on several buildings where damage occurred during snow storms were investigated and building code snow loads were determined.

Wind speeds and resulting wind loads on one of the largest cranes in the world were determined. With the structural engineer, the wind speed expected to cause failure was shown to match the actual wind speed.

An investigation of wind speed and wind load on this scissor lift during a wind storm showed the wind was capable of tipping it over, but was not sufficient to tip over two other lifts on site.

A post-storm prediction of wind speed at a meteorological station using a weather prediction program showed good agreement with actual measurements. This post-storm analysis procedure was then used to determine wind speeds at an accident site where no wind speed measurements were available.

A rapid estimate of wind speeds at this accident site shortly after the accident provided early guidance to potential failure issues. The estimate was based on observed damage to nearby structures and trees.

Assessment of tornado wind speeds based on photographic records provided valuable input to potential damage to buildings.

 

Assessment of damage from high winds; developing wind loads or using damage to estimate wind speed.