A few years ago I performed a structural analysis for a very old factory which was being converted into a storage building for the local Historical Society. I was just recently contacted by the group asking if they could have a party in the building. I re-ran the numbers and determined that the allowable live load is 45 psf. The building code requires 100 psf for an "assembly" live load but doesn't give a definition of what an assembly is (or maybe I'm missing it??). The building is 3 stories with 5000 sq. ft. per floor. They intend to invite 500, expect 200, and spread these 200 over the 2nd/3rd floor. Would you guys be comfortable with this type of loading and an allowable calculated load of 45 psf? 10000 sq. ft. / 200 people = 50 sq ft / person.
Also, while I'm on the topic, does anyone know why fixed seating lowers the live load?
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