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This page is devoted to frequently asked questions (FAQ) related to design. |
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General
How do I specify a certain design code?
Answer: The design code may be specified by selecting Design > _ Frame Design > View/Revise Preferences. Under Item 1 Design Code, select the appropriate code from the drop-down list.
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Why do some members always differ during design iterations?
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When convergence occurs, it is best to review the results, then if necessary, make changes manually. To report zero differences between analysis and design sections, fewer members must be provided to the Auto List, especially for sections available to the lateral systems.
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Can different performance measures (D/C ratio) be assigned to various objects during steel frame design?
Answer: Yes, design overwrites may be applied to various structural members within a single model. For example, to apply AISC 360-05, select Design > Steel Frame Design > View/Revise Overwrites, then item 44 of the menu allows specification of the Demand/Capacity Ratio Limit. Overwrite values will then supercede the D/C ratio defined within design preferences.
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Why is the moment obtained from analysis different from the moment used for design?
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Answer: The design procedure may be changed by selecting the appropriate members, then switching from Composite Beam Design to Steel Frame Design through Design > Overwrite Beam Design.
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For steel-angle design, how is orientation considered?
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Of use may be the SAP2000 and ETABS Steel Frame Design Manual > Chapter VII, Check/Design for BS 5950-2000. This resource is available within software documentation. All details regarding design algorithm and implementation are presented.
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Formulation
How reliable is the formulation for unsupported length?
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Answer: The calculation of allowable capacities for steel frame design according to AISC 360-05 is explained in Context Help (Section 3.5 – Calculation of Nominal Strengths), available through Help > Documentation > Design.
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Can the design equations used in SAP2000 be customized?
Yes, tabular results may be exported to Excel using the Display > Show Tables > Design Data command. The intermediate values reported within the Excel file may then be used to calculate D/C ratios and other pertinent data.
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How should the Response Modification Factor (RMF) be applied to bridge components per AASHTO seismic requirements?
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Answer: If the section is over-reinforced, additional reinforcement will not increase resistance. When section design provides for a compression-block depth which exceeds prescriptive criteria, section depth or section width should be increased to achieve additional capacity.
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