Problem $3$ Given: A one$-$story two$-$bay steel building frame consists of a braced bay and unbraced bay. The steel

cables serve as in$-$plane bracing so that the frame has no sidesway when any one of columns, AB$,$ CD$,$ or DE buckles.

In the plane perpendicular to the frame, bracing is provided at the base and floor levels. Columns AB and

CD are subjected to axial compressive load P$,1\mathrm{.}10$P$,$ respectively, where P consists of $60\%$ dead load and

$40\%$ live load. Fy $=50$ ksi steel is used.

Required: The maximum load P that can be applied to the frame.

Pin connection

W$14$x$120$

Steel cables as

bracing in the

plane of the

frame.

Braced bayUn$-$braced bay

E

F

P $1\mathrm{.}10$P

W$14$x$132$