The three bars are pinned together and subjected to the load P. If each bar has a cross-se...

The three bars are pinned together and subjected to the load P. If each bar has a cross-sectional area A, length L, and is made from an elastic perfectly plastic material, for which the yield stress is σy, determine the largest load (ultimate load) that can be supported by the bars, i.e., the load P that causes all the bars to yield. Also, what is the horizontal displacement of point A when the load leaches its ultimate value? The modulus of elasticity is E.