Figure 7-1.—Symbols for single structural shapes
a beam or column when used alone. But the channels
may be assembled together with other structural shapes
and connected by rivets or welds to form efficient
built-up members.
ANGLES—The cross section of an angle resembles
the letter L. Angles are identified by the dimensions in
inches of their legs, as L 7 x 4 x 1/2. Dimensions of
structural angles are measured in inches along the
outside or backs of the legs; the dimension of the wider
leg is given first (7 in the example). The third dimension
is the thickness of the legs; both legs always have equal
thickness.
Angles may be used singly or in
combinations of two or four angles to form members.
Angles also are used to connect main members or parts
of members together.
TEES—A structural tee is made by slitting a
standard I- or H- beam through the center of its web,
thus forming two T-shapes from each beam. In
dimensioning, the structural tee symbol is preceded by
the letters ST. For example, the symbol ST 5 WF 10.5
means the tee has a nominal depth of 5 inches, a wide
flange, and weighs 10.5 pounds per linear foot. A rolled
tee is a manufactured shape. In dimensioning, the rolled
tee symbol is preceded by the letter T. The dimension
T 4 x 3 x 9.2 means the rolled T has a 4-inch flange, a
nominal depth of 3 inches, and a weight of 9.2 pounds
per linear foot.
7-2
