07-Str-A2, December 2017: worked solutions

Paper format. National Examinations, December 2017 — 07-Str-A2 Elementary Structural Design. Three hours, closed book (handbooks and textbooks permitted). Seven questions in three parts: Part A (A1–A3, steel), Part B (B1–B3, reinforced concrete) and Part C (C1, timber). The candidate answers two from Part A, two from Part B and the single Part C question — five solutions of equal value. All seven are solved here, because the set is a study resource. Page 1 states that all loads shown are unfactored, so every question below applies its own load combination.

Reference texts and standards.

CSA S16:19, Design of Steel Structures (clauses 11 classification, 13.3 compression, 13.5–13.6 bending, 13.8 combined loading, 13.4 shear).
CISC, Handbook of Steel Construction, 11th ed. — section property tables for W-shapes and hollow structural sections.
CSA A23.3:19, Design of Concrete Structures (clauses 10 flexure and axial load, 10.15–10.16 slenderness, 11.3 shear).
MacGregor & Bartlett, Reinforced Concrete: Mechanics and Design, Canadian edition.
CSA O86:19, Engineering Design in Wood, with the Canadian Wood Council Wood Design Manual (glulam 24f-EX tables, modification factors).
NBCC 2020 load combination 1.25D + 1.5L (and 1.25D + 1.4W where wind governs).

Check: figure page. All five figures are hand-drawn on page 3 of the paper. Every dimension used below was read from the printed figures, cross-checked against the labelled dimension chains (for example 200 overhang + 3 × 200 stems + 2 × 600 voids + 200 overhang = 2200 in Figure B3). Where the exam leaves a quantity undimensioned (the tie length in Figure A3, member thicknesses in Figure B1) the assumption is stated in the question concerned, as NOTE 1 on page 1 invites.

07-Str-A2: December 2017