Please solve part $3.$ I. A $5-$story office building below has the steel special moment resisting frames for the seismic force

resisting system. Each story is $12$ ft tall. The story displacements are given as shown from the linear

elastic analysis. The following is required:

What is the elastic story drift $($inter$-$story displacement$)$ at

level $5($roof$)$ and level $3,$ respectively.

What is the design story drift ratio for level $5$ and level $3,$

respectively.

What is the allowable story drift ratio for this building?

Justify your answer.

III. Below are the seismic design parameters of a building:

Site shear wave velocity for the top $100ft(vs)=1100f\frac{t}{sec}$

$($assume no clay, peat or liquefiable soils$)$

Mapped spectral response acceleration at $0\mathrm{.}2-sec$ period, $Ss=1\mathrm{.}00(g)$

Mapped spectral response acceleration at $1-$sec period, $S_1=0\mathrm{.}45(g)$

Building period, $T_a=0\mathrm{.}80sec$

Long$-$period transition period, $T_L=8sec$

Required:

The site class of the building

The design spectral response acceleration, $S_a$

The seismic base shear for equivalent force procedure design $($in terms of $W,$ the total

effective seismic weight of the building$)$