3. A 5-m rod having a uniform cross-sectional area of 1000 sq.mm. is secured between two walls 5 meters apart. The load on the rod is zero at 27 °C. E = 200 GPa, a = 11.25x10“ m/m-°C. When the temperature rises to 57°C: a) What is the stress in the rod assuming that the walls are rigid. b) What is the stress in the rod if the walls spring together a total distance of o.5 mm.

The structure consists of two bars. Axial loads 40 kN and 10 kN are loaded as shown in Figure B. Determine: a) Global stiffness matrix b) Nodal displacement c) Stress in each bar Table 2 Steel Aluminium Brass Area 400 350 350 (mm³) E(Gpa) 200 70 83 Aluminum Brass Steel 40 kN - 10 kN L 500 mm 400 mm 300 mm

The frame in the figure is made of bars that have a square (solid) cross section of 3 cm on each side. A load of 5 kN is applied to the reinforcement. a) Draw the FBD of the reinforcement indicating the forces in each bar b) Calculate the stresses in each bar (don't forget to indicate if these are compressive stress or tension) c) Calculate the deflection of the bar AB if it were made of steel with E = 200 GPa