Draw the displacement- time free vibration response of structural system

shown in figure in the lateral direction and Determine the amplitude of Equivalent

static force . Assume

i. E= 29,000 ksi, 6 x 6 in beams and column

ii. Beam -column joint as fixed end

iii. Displacement and velocity at the start of free vibration are 0.005 ft and 0.25

ft/s

2 k/ ft 10 ft 10 ft 15 ft