"W" Shape
A hot rolled member with parallel flanges.
Wainscot
Wall material used in the lower portion of a wall that is different from the material in
the rest of the wall.
Walk Door
See "Personnel Door".
Wall Covering
The exterior wall surface consisting of panels or other material.
Web
That portion of a structural member between the flanges.
Web Member
A secondary structural member interposed between the top and bottom chords of a
truss.
Web Stiffener
See "Stiffener".
Wheel Base
Distance from center-to-center of outermost crane wheels.
Wheel Load
The vertical force without impact produced on a crane wheel bearing on a runway rail
or suspended from a runway beam. Maximum wheel load occurs with the crane at
rated capacity and the trolley positioned to provide maximum vertical force at one set
of wheels.
Width
The dimension of the building measured parallel to the main framing from sidewall to
sidewall.
Wind Bent
See "Portal Frame".
Wind Column
A vertical member designed to withstand horizontal wind loads.
Wind Load
The load caused by the wind from any horizontal direction.
Wind Uplift
The differential pressure resulting from the deflection of wind at roof edges, roof
peaks or obstructions, causing a drop in air pressure immediately above the roof
surface. This pressure, combined with "Internal Pressure", produces an upward force
on the roof components. In "Built-Up Roofing", wind uplift may also occur because of
the introduction of wind pressure underneath the membrane and roof edges, where it
can cause the membrane to balloon and pull away from the deck.