Figure 7.1- Symbols for single structural shapes

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