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A three-story school has interior column bays that are spaced 25 ft apart in both directions. If the loading on the flat roof is estimated to be 20 lb/ft2, determine the reduced live load supported by a typical interior column at ground level.

Respuesta :

Answer:

Explanation:

Floor Load:

Lo= 50psf

At= 25x25 = 625 square feet

[tex]L= Lo(0.25 +15/\sqrt{KuAt)}[/tex]

[tex]L=50(0.25+15/\sqrt{(4)(625)}[/tex]= 13.1psf

%reduction= 13.1/50 = 26%

Fr= 3[(13.1psf)(25ft)(25ft)+(20psf)(25ft)(25ft)]= 62k

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