A curved $2-$span bridge is supported on two abutments and a rectangular single$-$column bent. The two spans have identical lengths of $100ft.$ The cross$-$section of the bridge is shown in the figure below. Given the following information, compute the maximum bending moment and shear force that the column could encounter at its base section under the effects of centrifugal and braking forces.

Data:

Radius of curvature of traffic lane $=1,200ft$

$,$ Highway design speed $=70mph$

Assume that the abutment bearings can accommodate displacements in the longitudinal direction.

Assume that the column is designed to behave in double curvature $($i$.$e$.$ designed with a rigid connection at the top

To be conservative, ignore the effect of shear keys at the abutment.

You may assume that the multiple presence factor is $1\mathrm{.}0$