Overstrength Factors

Helpful Questions & Answers

  • Frequently Asked Questions (FAQs)

How do I include the overstrength factor(s) Ωo in the ASCE 7 load combinations?

Answer

1) Open the Load Cases & Combinations dialog box. Under the Base tab, select the Edit Parameters of Edition option. The default values are set to 2.0 (Image 01)

Case A: To apply the same factor in the X and Y directions, use the generic (no direction) overstrength factor Ωo.

Case B: To apply different factors in each direction, use the overstrength factors X and Y, Ωo,x and Ωo,y. The generic factor Ωo in the first row is not used.

2) Under the Load Cases tab, create a seismic load case with Qe as the Action Category. Next, select the Additional Settings tab and pick the direction (Image 02)

Note: When neither or both directions are activated under the same load case, the generic overstrength factor, Ωo is used. Create a separate load case to apply the individual factors, Ωo,x and Ωo,y.

3) Under the Design Situations tab, select the applicable overstrength Design Situation Type. Both LRFD and ASD methods are available (Image 03)

4) In the Load Combinations tab, verify that the correct factor(s) have been applied. Factors are also shown in the Result Combinations tab, if applicable. Click OK to exit (Image 04)

5) The final step is to assign the applicable limit state type to the overstrength design situation. For members without assigned seismic configuration, select the "Strength limit state" (LRFD or ASD) as the Limit State Type. For members with assigned seismic configuration, use “Earthquake limit state – overstrength” (LRFD or ASD) [available in future release] (Image 05)

Keywords

Overstrength factor ASCE 7 Load combination Seismic load case Earthquake Limit state type Design situation

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  • Updated 01/30/2023

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