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A 12 ft tall commercial building that is 130 ft long and 35 ft wide

Roof construction (flat


Asphalt shingles = 3.5 psf

Reroofing = 3.5 psf

5/8 thick plywood sheathing = 2.1 psf

Wood Roof Trusses = 6 psf

Insulation = 3 psf

5/8 in. thick gypsum wallboard = 2.8 psf

Miscellaneous = 3 psf

The walls are tilt-up reinforced concrete, where they are poured in-place on the ground and then tilted up into place and braced until the roof is built. All four walls are conservatively assumed to be solid, neglecting doors and window openings. They are 6" thick and composed of reinforced concrete with a unit weight of 150 pcf. Assume that there are no interior walls.


a) Overall weight, W (seismic dead load), of the building.

b) Base shear, V, from the seismic loading = total lateral (sideways) earthquake loading on the building. This is the lateral load that must be resisted by the foundation. Use the equation found in Hibbeler in the section on Earthquake Loads where V = CSW and CS = SDS /(R/Ie). These are also found in Equations (12.8-1) and (12.8-2) of ASCE 7-16. Note that CS and SDS can both be considered unitless, so that when you have W in kips you get V in kips as well.


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