*4-44. The rigid beam is supported by the three suspender bars. Bars AB and EF are made of aluminum and bar CD is made of steel. If each bar has a cross-sectional area of 450 mm², determine the maximum value of P if the allowable stress is (allow)st 200 MPa for the steel and (σ allow)al = 150 MPa for the aluminum. Est = 200 GPa, Eal = 70 GPa. - B D F volli al st al 2 m A C E 0.75 m 0.75 m 0.75 m 0.75 m PV 2P