A tensile test was conducted on a mild steel bar. The following data was obtained from the test: Data: (i) Diameter of the steel bar = 3cm (ii) Gauge Length of the bar = 20cm (iii) load at elastic limite = 250kN (iv) Extension at a load of 150 kN = 0.21mm (v) Maximum Load = 380kN (vi) Total extension = 60mm (vii) Diameter of the rod at the failure = 2.25cm Determine: (a) The Young's modulus

The following terms apply to LRFD (limit state design) and ASD. Which of the following is a limit state design concept?

Q2 - The assembly shown below consists of three rods AB, CD and EF with the following properties: AB and CD: Modulus of elasticity = 75 GPa; Diameter = 30 mm EF: Modulus of elasticity = 200 GPa; Diameter = 15 mm If there is a 0.5 mm gap at A and C before loading, Determine the average normal stress developed in rods AB, CD and EF. Note: The cap GH is rigid. 0.5 mm -250 mm A C 30 mm 30 mm B D H G E 500 mm 50 kN 50 kN 15 mm F

Question 4 : Please answer part A and B!