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07-Str-A2: May 2014

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Welded moment connection at B
  2. Question 2 Moments of resistance of the built-up bridge section
  3. Question 3 Maximum factored axial load on the 18 m bridge
  4. Question 4 Reinforced concrete section for member ABC
  5. Question 5 Design of column CD
  6. Question 6 Resistances of the reinforced concrete culvert
  7. Question 7 Design of oblique sawn timber purlins

Start with Question 1 →

Paper format. National Examinations, May 2014 — 07-Str-A2 Elementary Structural Design, 3 hours, closed book (handbooks and textbooks permitted). Seven questions in three parts: Part A steel (three questions), Part B reinforced concrete (three questions), Part C timber (one question). Candidates answer two from A, two from B and the one in C — five solutions in all, every question of equal value (20 marks). All seven are worked below.

Reference texts for 07-Str-A2.

  • CSA S16:19, Design of Steel Structures — named on the paper.
  • CSA A23.3:19, Design of Concrete Structures — named on the paper.
  • CSA O86:19, Engineering Design in Wood — named on the paper.
  • CISC, Handbook of Steel Construction (section tables and beam-diagram formulae; the paper directs the candidate to it in question A1).
  • CWC, Wood Design Manual (O86 specified strengths and modification factors).
  • MacGregor & Bartlett, Reinforced Concrete: Mechanics and Design (Canadian edition).
  • Kulak & Grondin, Limit States Design in Structural Steel (CISC).
  • NBCC 2020 Part 4 for the load combinations.

Check — load factors, stated once for the whole paper. Page 1 note 6 says “All loads shown are unfactored”, and the paper nowhere splits dead load from live. Every applied load below is therefore taken as specified live load with $\alpha_L = 1.5$ (NBCC 2020 Table 4.1.3.2, principal-load case 2); member self-weight is small against the applied actions and is neglected except where noted. A candidate who instead assumed a dead/live split would obtain proportionally different factored actions but identical method and identical section proportions.