What Should You Know About Aircraft Hangar Structural Design?

Aircraft hangars are designed around clear spans and big doors: long-span structural systems with no interior columns, hangar door systems engineered as structural elements, foam fire protection for the aircraft hazard, and apron interfaces. The door system and the structure are designed together. The design starts with the aircraft: wingspan, tail height, and weight determine the opening size, the clear height, and the floor loads. Everything — the structural system, the door, the fire protection category — follows from the design aircraft. Designing a hangar without a defined aircraft is designing a question mark.

The long-span structural system is the core engineering. Clear spans of 150 to 300 feet need trusses, rigid frames, or arch systems designed for the full load set — and the lateral system has to work with a building that's essentially open on one side. The door header carries enormous loads, and when the doors are open, the building's lateral behavior changes. I design hangar structures for both conditions: doors open and doors closed. Hangar door engineering deserves its own attention. Bottom-rolling doors need rails, guides, and foundations engineered for the door weight and wind loads; vertical-lift doors need the header structure to carry the lifted door; fabric doors need their own structural framing. The door manufacturer's requirements — power, controls, safety interlocks — have to be in the building design from the start, not coordinated during construction.

A hangar is a long-span structure wrapped around an airplane. The fundamentals below keep the design honest.

• Define the design aircraft: wingspan, tail height, and weight before any structural decisions
• Engineer the clear span: long-span system with lateral design for doors-open and doors-closed
• Design the door as structure: door type, loads, power, and interlocks coordinated with the frame
• Protect against the fuel hazard: foam suppression per NFPA 409 and drainage for discharge
• Build the floor for aircraft: flatness, gear loads, fuel resistance, and trench drainage