GIVEN INFORMATION The structure shown on the attached page is a 4-story mixed-us
ID: 1712935 • Letter: G
Question
GIVEN INFORMATION The structure shown on the attached page is a 4-story mixed-use building comprised of a concrete moment frame. The floor use is as provided Floor Level Use/Description 8" thick concrete slab Roof/s 3-ply ready roofing Supports suspended ceiling and mechanical ducts below Residential dwelling area 8" thick concrete slab Supports acoustic ceiling tile and mechanical ducts below Offices 8" thick concrete slab Supports linoleum tile Supports acoustic ceiling tile and mechanical ducts below Retail (upper floor) 8" thick concrete slab Supports mechanical ducts below Retail (lower floor) 4th 3r 2nd Ground/19 6" thick concr ete slab (supported by the ground Each floor also supports steel decking and batt insulation below, which together weigh 8 psf The frame geometry is given as: 23 ft H = 10.5 ft w=19 ft 0-11 Assume the floor and roof slabs behave as two-way slabs. The building is located in New York, NY The building is located directly adjacent to a police station, so developer is required to design the building using Risk Category IlI. The concrete moment frame has a reduced ductility, resulting in a response modification factor R = 5 The site soil classification is C. The building is located in an area with no terrain irregularities, on a characterized as Exposure Category C.Explanation / Answer
From Table 4.1 ASCE 7-10
a) 4th floor is dwelling area. From Table, for residential, for public rooms and corridors, live load is 100 psf
b) For 3rd floor, for offices, live load is 50 psf
c) For retail store, except 1st floor, other floors have load of 75 psf.
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