Exterior columns have not been considered in the

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Exterior columns have not been considered in the formulation of the column size tables for two reasons. First, exterior columns are commonly engaged as part of the lateral load resisting system, particularly in the case of moment resistant lateral frames. Secondly, exterior beams and girders often transfer exterior wall loads to the exterior columns. Façade types as well as façade loads can vary significantly. As a result it would be difficult to formulate a concise set of generalized tables to account for these conditions. As a general "rule of thumb", exte- rior columns can be approximated to be the same size as interior columns. As with any design problem there are many solutions. Each project will have a unique set of loading parameters. The design information and example have been prepared accurately and consistent with current structural design practice for several different load cases. The information presented in this publication has been prepared in accordance with recognized engineering principles and is for general information only. While it is believed to be accurate, this information should not be used or relied upon without competent professional examination and verification of its accuracy, suitability, and applicability by a licensed professional engineer, designer, or architect. Design Parameters and Limitations Many specific parameters and limitations go into the design of any structural member. Imposed loadings caused by earthquake, wind, snow, rain, construction methods, etc. vary across the country. Live loads are specified in the applicable building codes. Dead loads are much more system-dependent and require special attention in their computation. Specific requirements for serviceability, strength, lateral stability of individual elements, and the lateral resistance of the building all contribute to the design of a safe and efficient building. The information pre- sented in the tables to follow is intended for use establishing preliminary interior column dimensions only without regard to earthquake loading or contributing to lateral resistance of the building. Column dimensions have been selected based on properties for rolled wide flange shapes, as well as hollow structural section and pipe column shapes. Bay sizes range form 20 ft × 20 ft to 40 ft × 40 ft in 5 ft increments. Both square and rectangular bays have been accounted for. As a result, 15 different bay sizes for each of two load cases have been tabulated for three different slab construction types. Dead loads address the self-weight of the floor/roof framing system.
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SYSTEMS PAGE 90 Interior column sizing tables are based on the following parameters: ! Load and Resistance Factor Design Specification , American Institute of Steel Construction, 1999 ! Live and dead loads are uniformly distributed over a bay area ! Full live load has been applied to a full bay: No live load reduction has been taken into account ! Maximum floor-to-floor height is 15 ft ! Column sizes tabulated do not account for lateral resistance of the building !
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  • Fall '19
  • Structural steel

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