A two$-$story shear$-$wall structure has the dimensions and configuration shown in Figure. Each story is $12ft$ high and the thickness of all walls is $8in.$ The floor weights are $350$ and $250$ kips, respectively for the first and second levels. the structure is subjected to a ground motion along its longitudinal direction with base shear is $180$kips. Assume the lateral stiffness of shear walls is equal to $G\frac{A}{h}$ where $G$ is shear modulus of elasticity, $A$ is cross section area, and $h$ is height. Determine:

The story shears.

The Location of center of twist.

The Torsional moments.

The Shearing forces induced by translational motion alone in the longutidnal walls at first story.

The Shearing forces induced by torsional motion alone in the longutidnal walls at first story.