Question $2)$

The Equivalent Seismic Load Method will be

$F_2$

used to obtain the seismic loads for the two$-$story frame system given.

The dominant period in $x$ direction:

$T_x=T_1=0\mathrm{.}42sec$

Typical Story Height: $h_i=L=3m$

Story masses: $m_1=160$ ton, $m_2=140$ ton.

The Spectral Acceleration Coefficients, for the DD$-2$ Seismic Level are given as:

$S_{Ds}=0\mathrm{.}960$

$S_{D1}=0\mathrm{.}340$

Behavior Factor: $R=8$

Overstrength Factor: $D=3$

Importance Factor: $I=1\mathrm{.}0$

a$)$ Find the Horizontal Elastic Design Spectral Acceleration $S_{ac}(T_x)$ in $x$ direction.

b$)$ Calculate the Seismic Load Reduction Factor $R_a(T_x)$ and Reduced Spectral Acceleration $S_{ak}(T_x)$ in $x$ direction.

c$)$ Calculate the Base Shear Force in $x$ direction.

d$)$ Find the Equivalent Seismic Loads acting on each floor $(F_{1x}$ and $F_{2x}).$