Page 329 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

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FLOOR AND ROOF SYSTEMS

FLOOR AND ROOF SYSTEMS 7.13

FIGURE 7.14 (a) Gypsum-concrete roof deck. (b) Cast on formboard, the deck is supported by a steel
bulb tee.

FLOOR FRAMING

With a large variety of structural steel floor-framing systems available, designers frequently investi-
gate several systems during the preliminary design stage of a project. The lightest framing system,
although the most efficient from a structural engineering standpoint, may not be the best selection
from an overall project standpoint, since it may have such disadvantages as high fabrication costs,
large floor-to-floor heights, and difficulties in interfacing with mechanical ductwork.
Spandrel members are frequently subjected to torsional loadings induced by facade elements and thus
require special consideration. In addition, design of these members is frequently governed by deflection
criteria established to avoid damage to, or to permit proper functioning of, the facade construction.

7.8 ROLLED SHAPES

Hot-rolled, wide-flange steel shapes are the most commonly used members for multistory steel-
framed construction. These shapes, which are relatively simple to fabricate, are economical for
beams and girders with short to moderate spans.

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