Explain the idea of Second moment of area, and its role in the design calculations;

Part A

  1. Explain the idea of Second moment of area, and its role in the design calculations;
  2. Explain with the aid of a drawing which dimension would affect the second moment of area if you have a rectangular beam subjected to UDL;
  3. For different sections from real life, i.e. rectangular sections, I sections, C sections, give examples of the determination of the second moment of area ( parallel axis theorem)

 

Part B

  1. Explain the idea of Young’s modulus, and its role in the design calculations;
  2. Give examples how the Young’s modulus of a material would affect the behaviour of a structural member subjected to bending;
  3. Choose three construction materials, compare their stiffness and explain which material would give the least deformation when subjected to external forces.

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