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Engineering · Civil Engineering
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please answer question 2a and 2b with clear steps and remarks

(a) For the pin-jointed truss under design loads shown in Figure 2(a), member BC, AC and AD using the Method of Sections. Indicate whether the members are in tension (T) or compression (C) calculate the forces in 20 kN 70 kN 45° 45° 45° 45 80 kN 45° 45 4m 4m 4m L 4m 4m Figure 2(a)

(b) A sample of a steel member was taken for tensile testing and had a cross-sectional area of 50 mm2 and a gauge length of 300 mm. Using the force vs deflection curve below, determine the: i) Yield strength ii Ultimate tensile strength iii) Ductility 20000 18000 16000 14000 ︵ 12000 10000 8000 6000 4000 2000 0 0 2 Extension (mm) iv) If the steel specimen is to be work hardened, qualitatively what wi happen to the modulus. yield strength, ultimate tensile strength and ductility i.e. higher lower, or no change? Provide an explanation for each of your answers

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