Problem 4. The A992 steel (E = 29 x 10 psi, oy=50,000 psi) bar AB has a solid square cross section. Bar BC has a solid round cross section (dia=0.75"),

is made of the same material as bar AB. Both are pin connected at its ends, determine the maximum allowable load P that can be applied to the frame. Consider the possibility of tensile failure of bar BC (use maximum shear stress failure theory) and buckling of bar AB.