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07-Str-A2: May 2013

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

  1. Question 1 Moments of resistance of a built-up channel-and-plate section
  2. Question 2 Welded rigid splice in an overhanging W610x241 beam
  3. Question 3 Maximum factored bracket load on a round HSS column
  4. Question 4 Design of an overhanging reinforced concrete beam
  5. Question 5 Moment and shear resistances of a triple-T floor section
  6. Question 6 Design of the column of a determinate reinforced concrete frame
  7. Question 7 Check of a sawn timber floor beam to CSA O86

Start with Question 1 →

Paper format. 07-Str-A2 Elementary Structural Design, National Examinations May 2013, three-hour duration. The paper is printed on three pages: page 1 carries the notes and the marking scheme, page 2 the seven questions, page 3 the five hand-drawn figures. Part A (steel, questions A1–A3), Part B (reinforced concrete, questions B1–B3) and Part C (timber, question C1) are answered by doing two of three from Part A, two of three from Part B and the one question in Part C — five solutions in all, all questions of equal value. Because this set is a study resource, all seven questions are solved below. Note 3 of the paper fixes the design standards: steel to CSA S16, concrete to CSA A23.3, timber to CSA O86 (latest editions). Note 6 states that all loads shown are unfactored.

Reference texts. CSA S16, Design of Steel Structures, with the CISC Handbook of Steel Construction (section tables, Class H HSS, fillet-weld tables); CSA A23.3, Design of Concrete Structures; CSA O86, Engineering Design in Wood, with the CWC Wood Design Manual; National Building Code of Canada (load combinations); MacGregor and Bartlett, Reinforced Concrete: Mechanics and Design (Canadian edition); Salmon, Johnson and Malhas, Steel Structures: Design and Behavior.

Check — load factors used throughout. The paper states that all loads shown are unfactored but nowhere splits them into dead and live. Every applied load in Figures A2, B1, B2 and B3 is therefore taken as a specified live load and factored by 1.5, and self-weight (where the question asks for it) by 1.25, per NBCC load combination case 2, 1.25D + 1.5L. If a grader intends a different split the factored actions scale linearly and every design step below is unchanged. Self-weight of the steel members in A2 and A3 is neglected; for the W610x241 of A2 it would add about 4 per cent to the moment at B.