(Solved): The pin-connected structure shown consists of a rigid bar ABCD and two axial members. Bar (1) is s ...

The pin-connected structure shown consists of a rigid bar ABCD and two axial members. Bar (1) is steel [E = 200 GPa; a = 11.7 x 10-6/°C), with a cross-sectional area of A1 = 410 mm2. Bar (2) is an aluminum alloy [E = 70 Pa; a = 22.5 x 10-6/°C], with a cross-sectional area of A2 = 420 mm2. The bars are unstressed when the structure is assembled. Assume a=310 mm, b=560 mm, c=690 mm, P=37 kN, and L=880 mm. After a concentrated load of P= 37 kN is applied and the temperature is increased by 15°C, determine (a) the normal stresses in bars (1) and (2). (b) the deflection of point D on the rigid bar. L A (1) a B (2) P b ?