Angle Iron Sizes
Angle iron sizes, steel angle iron, metal angle iron, and structural steel angles are all different names for steel angle. Though not considered major structural framing members like wide flanges and steel tubing, steel angles provide much needed supporting roles in lighter structural elements.
This page is about angles with legs that are unequal with section properties, and dimensions are shown in this pdf file. As shown in the tables, these standard metal angle iron vary widely both in the leg sizes and thickness.
These unequal leg angles has wide range of usage in building construction. For example, concrete floor poured on metal decks, L5x3x1/4, L6x4x5/16, L6x3 1/2x5/16, or L7x4x3/8 are commonly used as closure angle in place of closure plate.
These angles are placed with the long leg vertical to match the total thickness of the slabs. Using of angles are sometimes preferred over bent plates due to the extra labor in cutting and bending steel plates.
At areas where steel columns passes from floor to floor, equal legs steel angles usually L3x3x1/4 or L2x2x1/4 are welded from beam to beam to support the floor deck near steel columns.
Roof edges framing, L5x3x1/4 are normally used for closure and at roof openings. Where 1 1/2" metal roof deck is used, L3x3x1/4 is usually the roof closure providing support for the deck and the roofing.
For CMU framed structure with metal deck for roof or floor L5x3x1/4 are often used as ledger angles. In this application, one leg is to support the metal deck, the other to transfer the shear load to the walls. These are done either by using J bolts, expansion bolts, or epoxy bolts. In either case, the long leg can either be vertical or horizontal
Structural steel angles in most cases are ASTM A36 steel meaning that their yield strength is 36 ksi. They are also available in A572 grade 50 or 50 ksi yield strength, often required in Federal projects, particularly bridges.
The section properties shown in the tables are the information used by architects, engineers, manufacturer, contractors, and fabricators which enable them to make necessary judgments with regard to the strength and limit of these angles.
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