National Geospatial-Intelligence Agency
The National Geospatial-Intelligence Agency in Fort Belvoir, Virginia is the third largest federal building containing more than 2.4 million sf. and having a construction cost of approximately $1.8 billion. The facility includes five primary structures, the Main Building, Central Utility Plant, Technology Center, Visitor Control Center, and Remote Delivery Facility, each ranging from one to eight stories. Hinman provided AT/FP consulting services for all phases of the project from concept design through construction administration.
Hinman assisted the design team to optimize the site layout to meet the functional requirement s while maximizing secured setbacks to support an award winning architectural design.
Hinman was part of the project team working to meet an elevated level of protection for AT/FP, considering four distinct threat scenarios. Hinman assisted the design team to optimize the site layout to meet the functional requirement s while maximizing secured setbacks to support an award winning architectural design.
One of the challenges of this unique design was the Main Building atrium consisting of a steel panel and glass façade backed by an eight-story three-dimensional truss system to provide lateral support. Using DYNA 3D finite element analysis, Hinman showed that the façade and supporting trusses were able to resist the defined explosive loads without failing and meet balanced design conditions.
A second challenge was presented by the lightweight ETFE atrium roof system. Initially this roof system was shown to fail under the defined explosive loading based on the manufacturer supplied failure strength. Hinman showed that the actual ultimate failure strength was higher than the value provided by the manufacturer, which enabled the project to retain this signature architectural feature.
In addition to AT/FP services, Hinman also provided the following:
- Peer review of the progressive collapse analysis performed by the SEOR to meet UFC 4-023-01.
- Vibration foot fall analysis required to maintain performance of sensitive equipment used within the facility