Background
This project entailed a progressive collapse analysis and blast evaluation of the existing headquarters building, a 3-story reinforced concrete structure with approximately 48,310 square meters of office space.

Specialized Knowledge
The progressive collapse analysis conformed to the DoD Progressive Collapse Design Guidance and the blast evaluation considered the extent of damage due to 23 kg of TNT at 11 meters and 24 meters and 100 kg of TNT at 11 meters and 24 meters. Study included retrofit recommendations and cost estimates for the structure as well as review of blast resistant glazing and security bollards.

In addition, Baldridge & Associates Structural Engineering, Inc. (BASE) completed an evaluation of the seismic and hurricane resistance of the existing building. This program included confirming rebar layout using ground penetrating radar; soft demolition and material sampling; compressive strength testing of concrete; tensile strength and bond testing of rebar and soil borings. The results of the investigative study will be used to help develop a 3-dimensional finite element analysis of the existing building.