Metal Building Glossary - "D"

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Building Terms:

Damper
A baffle used to open or close the throat of building ventilators which can be optionally operated manually or by motors.

Damper
A manually operated or motorized baffle used to open or close the throat of a ventilator.

Dead Load
The weight of all of a building's permanent construction, including the floor, roof, framing, and covering members.

Deflection
The displacement of a structural member or system under load.

Design Load
The load specified in building codes published by Federal, State, County or City agencies, or in the owners' specifications to be used in the design of a building.

Design Professional
A building architect or engineer.

Diagonal Bracing
Diagonally placed rods angles or cables used in the plane of the building's roof and walls to transfer loads, such as wind, seismic and crane thrusts to the foundation.

Diaphragm Action
The resistance to racking generally offered by the building's covering systems, fasteners, and secondary framing.

Door Guide
An angle or channel used to stabilize or keep plumb a building's sliding or rolling door during its operation.

Downspout
A conduit used to carry water from the gutter of a building.

Drift (sidesway)
Horizontal displacement at the top of a vertical element due to lateral loads. (Drift should not be confused with "Deflection".)

Drift (Snow)
The snow accumulation at a height discontinuity.

Drift Pin
A tapered pin used during assembly to align holes in steel members to be connected by bolting.


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