If rigid moment frames or shear walls are used as the

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If rigid moment frames or shear walls are used as the building's lateral system, the lateral system will not dictate the location of the enclosure system or interior wall finish surfaces. There are, however, cost implications and detail considerations that must be addressed if unbraced lateral systems are used. Additional information on lat- eral systems is given in the Systems Section of this Guide. Floor System. The floor system shown is a steel floor deck with a concrete topping system. Typical floor system thicknesses range from 4 in. to 7.5 in. The thickness of the floor system is dependent on the floor loads, the dis- tance that the system must span between beams, and the required fire rating. The metal deck can be either a composite steel floor deck, or a non-composite steel floor deck. A composite steel floor deck is a cold-formed steel deck that acts as a permanent form and as the positive bending reinforcement for the structural concrete topping. In other words, it is a steel deck which has dimples pressed in the deck which interlock with the cured cast-in-place concrete to form the tension reinforcing in the bottom of the slab. Non-composite steel floor deck is cold-formed steel deck that acts as permanent formwork for reinforced concrete slabs. It is only a form—the deck does not have dimples, and it does not act compositely with the concrete. The floor system can be supported on either non-composite beams, or composite beams. Non-composite beams are standard steel beams that support the metal deck and concrete topping. Composite beams are steel beams that have headed studs welded to the top flanges of the beams after the metal deck has been installed. These studs interlock with the cured cast-in-place concrete and act together as a composite unit. The advantage of com- posite beams is that the steel depths and weights can usually decrease as a result of the composite action. It should be noted, however, that the resulting shallower floor system should be carefully checked for any floor vibration concerns. PAGE 3 DETAILS
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DETAILS PAGE 4 Several other types of floor systems including cast-in-place concrete and precast concrete planks can be used with steel framing. Precast planks can economically span 10 to 40 ft between steel girders, depending on the floor load and plank thickness. Be careful, though, as long spans of planks may lead to deeper steel girders. Fireproofing . Applicable building codes will determine the required fire ratings for various construction classifi- cations. They also determine the required fire ratings for various components and systems within the building. All recognized fire rated systems are tested and passed by appropriate regulation standards agencies such as Underwriters Laboratories, or National Evaluation Service, Incorporated. Many types of fireproofing systems are available. Friable (soft) and cementitious fireproofing systems are generally the most cost effective types of spray- on systems. Intumescent paints may be a desirable solution as a fire-resistant coating for steel that is exposed to
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  • Structural steel

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