Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. National Examinations, December 2019 — 16-Civ-A2 Elementary Structural Design. Three hours, CLOSED BOOK. Seven questions in three parts: Part A (A1–A3, steel to CSA S16), Part B (B1–B3, reinforced concrete to CSA A23.3), Part C (C1, timber to CSA O86). A candidate submits five solutions — two from Part A, two from Part B and the single Part C question — all of equal value. All seven are solved below, because this set is a study resource rather than an exam script. Note 6 on page 1 states that all loads shown are unfactored unless otherwise stated, so every load pattern is factored here before it meets a resistance; Note 7 fixes G40.21 300W steel and 400W reinforcement unless a question says otherwise.
Reference texts.
Check — assumptions declared under Note 1 of the paper. (i) Figure A1 shows a solid vertical between F and C as well as the load arrow at C; that member is required, because without it the truss counts m + r = 12 + 3 = 15 against 2n = 16 and is a mechanism. With it, m + r = 16 = 2n and the truss is determinate, which is how it is solved here. (ii) In A3 the number of shear studs is reported as a bonus; the question asks only for the ultimate moment. (iii) In B1 the two stacked dimensions read as a sum, so the tee is 100 mm flange plus 400 mm of stem, i.e. 500 mm overall, and the beam spacing of 1250 mm governs the effective flange width because no span is given. (iv) In C1 the 1.5 kPa / 1.0 kPa area loads are converted to line loads on the 0.9 m tributary width, and the deflection limits adopted are L/240 on the back span and 2L/180 on the cantilever.
