(3) Thermal Loading: Three bars of equal length support a rigid bar as shown. The two outer bars are made of steel and the center bar is made of aluminum. The coefficients of expansion for these materials are as given. When there is no load applied to the rigid bar and the temperature is 20°C, the length of each bar is 250 mm. If a uniform distributed load of 150 kN/m is applied to the rigid bar and the temperature is raised to 80°C, what is the force in each post? a steel +14 x 106/°C a aluminum = +22 × 106 /°C 300 mm 300 mm- 150 kN/m 60 mm- 250 mm 40 mm 40 mm- Steel Aluminum Steel