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DEFLECTION - Downward or horizontal displacement of a truss due to loads.
DIAPHRAGM - A large, thin structural element that acts as a horizontal beam to resist lateral forces on a
building.
DRAG STRUT - Typically a horizontal member, such as a truss or beam, which transfers shear from a
diaphragm to a shear wall.
DROPPED GABLE – A gable truss that has its top chord lowered vertically to allow outlookers or a gable
ladder to form an overhang.
DURATION OF LOAD FACTOR - An adjustment in the allowable stress in a wood member, based on the
duration of the load causing the stress. The shorter the time duration of the load, the higher the percentage
increase in allowable stress.
ENERGY HEELS – See page 39.
HEEL – The vertical height of the truss at the end of the span, measured from the top of the top chord to the
bottom of the bottom chord.
HIP SET – A trussed system where three planes come in on a slope, so the outside planes look
like this:
GABLE END – A truss with vertical studs, usually spaced 24" on center (or closer). The gable usually sits on
an end wall and the studs help provide support for the sheathing and resistance to wind.
LATERAL BRACING - A member installed and connected at right angles to a chord or web member of a truss
to resist lateral movement.
