- C-5 Corrosion Control Hangar, Martinsburg, W.Va.
Burns & McDonnell is providing turnkey design-build services to the West Virginia Air National Guard for a new corrosion control hangar to support its C-5 beddown program. In this role, Burns & McDonnell is responsible for the final planning, design, construction, startup and warranty of the facility.
The corrosion control hangar includes 80,698 square feet of new construction, including a high hangar bay for C-5 aircraft and related shops to provide additional aircraft services. The facility is sized and configured to perform aircraft washing and periodic spot painting to inhibit corrosion.
The structural system of the hangar bay consists of long-span steel truss frames with the top chord supporting the roof purlins. The roof will slope at a 2.5:12 pitch and have an eave height of approximately 45 feet. The roof steps up over the center section of the aircraft to maintain the required clearances and have a curved roof shape above the tail and fuselage area with the nose area also curved and stepped down to resemble the existing C-5 maintenance hangar. The roof profile is curved. A low-bay roof area will be over the shops between the hangar and the existing facility. Exterior walls consist of a 9-foot, 2-inch masonry wainscot wall with steel insulted metal wall panels above. The hangar door is a five-panel vertical lifting fabric type door. An overhead monorail with a 2-ton electric hoist is provided in the shop areas.
The project is underlain by a limestone formation requiring deep foundations of drilled piers socketed into the underlying limestone. The slab includes a heavy reinforced concrete floor with various aircraft jacking points.
Heating and ventilation for the hangar is provided by two 36,000 cfm direct-fired natural make-up air units. Cooling is not provided. Gas-fired infrared heaters will provide an additional 3,500 MBH of heat throughout the hangar bay. Temperature and humidity control for the shops and small administrative office and break room is provided by split system type packaged air handling units. A microprocessor-based direct digital control (DDC) system will be provided to control the building's indoor environment.
The hangar bay is protected with an overhead pre-action sprinkler system and a supplemental low-level high-expansion foam system. The shops and administration areas will be protected by a wet-pipe automatic sprinkler system. Additional support systems include breathing air, shop air, overhead fall protection system, and mass notification system.
Infrastructure and support includes aircraft hangar access apron, utilities and outdoor mechanical and electrical equipment, roads, parking, fencing, and landscaping.
The project award was made at nearly $20.8 million.