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Steel Interchange


AISC Seismic Design Manual Table 4.2
Section 9.3a of the AISC Seismic Provisions references AISC Specification Section J10.6 for the panel-zone shear yielding strength, which has Ω = 1.5 for ASD. Table 4.2 in the AISC Seismic Design Manual provides a design aid for Special Moment Frames (SMF) that includes panel-zone shear parameters. However, the table only lists f = 1.0, which is for LRFD. Are these tables only good for LRFD or can they be used for both LRFD and ASD?

Answer

Because only the value of f is shown, the tabulated values are intended for use with LRFD. For a more detailed description of the table values please refer to page 4-77 in the AISC Seismic Design Manual. However, since f = 1.0 in the specific case you questioned, it is easy to adjust these values on your own for ASD. To do so, you can either compare the table values to Ω times your ASD required shear strength, or divide the tabular values of Rv by Ω for comparison with your ASD required shear strength.

 

Heath Mitchell, P.E.

Posted on April 20, 2010


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