The building whose plan is given below is single$-$storey and $h=3\mathrm{.}4m.$

A horizontal earthquake force of $75kN$ affects the floor slab in the y direction.

$D1=D0,D2=1\mathrm{.}75D0$ in C$-$C axis columns

In other columns, it is given as D$1=1\mathrm{.}25D0,D2=2\mathrm{.}25D0.D0=4\mathrm{.}00dm3$

type.

a$)$ Calculate the coordinates of the Rigidity and Mass centers and show the results on the figure given.

show.

b$)$ Considering the additional eccentricity, storey shear force and torsional moments occurring in the y direction

find it$.$ Show the results schematically by drawing them on the figure given.

c$)$ Find the shear forces resulting from the earthquake in the $y$ direction in the $S4$ column.