The floor plan of a building is shown below. The uniform dead and live loads applied over the floor are qD=65 psf and qL=90 psf. Compute the seismic weight, W (kip), supported by this floor. Assume 25% of the live load contributes to seismic weight. Compute the seismic mass, m, supported by this floor. Assume g=32.2 ft/sec2. Indi- cate the correct units of mass in terms of kip, ft, and sec. A “lollipop” model of an SFRS has seismic weight W=450 kip and stiffness k=60 kip/inch. What is the natural period, Tn, of the building model? If the stiffness of the lollipop model in the previous problem is doubled, i.e., k becomes 120 kip/inch, what is the natural period of the new model?
The floor plan of a building is shown below. The uniform dead and live loads applied over
the floor are qD=65 psf and qL=90 psf.
Compute the seismic weight, W (kip), supported by this floor. Assume 25% of the live load contributes to seismic weight.
Compute the seismic mass, m, supported by this floor. Assume g=32.2 ft/sec2. Indi- cate the correct units of mass in terms of kip, ft, and sec.
A “lollipop” model of an SFRS has seismic weight W=450 kip and stiffness k=60 kip/inch. What is the natural period, Tn, of the building model?
If the stiffness of the lollipop model in the previous problem is doubled, i.e., k becomes 120 kip/inch, what is the natural period of the new model?
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