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16-Civ-B2 Advanced Structural Design: December 2015

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

  1. Question 1 Welded Stiffened-Web Plate Girder
  2. Question 2 Post-Tensioned Prestressed Concrete Girder
  3. Question 3 Composite Steel–Concrete Warehouse Floor
  4. Question 4 Plastic Design of the Steel Rigid Frame
  5. Question 5 Beam-Column AB and the Welded Corner at B
  6. Question 6 Reinforced Concrete Design of the Continuous Girder
  7. Question 7 Reinforced Concrete Design of the Rigid Frame

Start with Question 1 →

Paper format. 98-Civ-B2 Advanced Structural Design, National Exams December 2015 — 3 hours, closed book (textbooks and design handbooks permitted). Seven design questions of equal value; any five constitute a complete paper. All seven are solved here. Page 1 carries the design data and the mark split; pages 2–3 the question text.

Design data (page 1). Design in SI. Concrete f'c = 30 MPa; structural steel Fy = 350 MPa; rebar fy = 400 MPa. Prestressed work: f'ci = 35 MPa at transfer, f'c = 50 MPa, n = 6, fult = 1750 MPa, fy = 1450 MPa, finitial = 1200 MPa, losses 240 MPa. Marks: Q1 (12+5+3), Q2 (10+5+5), Q3 (15+5), Q4 (16+4), Q5 (14+6), Q6 (10+5+5), Q7 (6+5+5+4).

Reference texts. CSA S16:19 Design of Steel Structures; CISC Handbook of Steel Construction, 12th ed.; CSA A23.3:19 Design of Concrete Structures; Collins & Mitchell, Prestressed Concrete Structures; Kulak & Grondin, Limit States Design in Structural Steel, 10th ed.; MacGregor & Bartlett, Reinforced Concrete: Mechanics and Design (Canadian ed.); Hibbeler, Structural Analysis, 10th ed. (plastic analysis, Ch. 18).

Check — load factors. Page 1 states only that “all loads shown are unfactored” and gives no dead/live split. Throughout this paper a single factor of 1.5 is applied to every load printed on Figures 1–4, and 1.25 to any self weight the solver introduces (girder, slab, concrete member). Collapse mechanisms, section classifications and interaction ratios are unaffected by that choice; only the magnitudes scale. A candidate who assumes 1.25D + 1.5L with a stated split will land within a few per cent of the numbers below.

Check — section properties. Every rolled W-shape is modelled from its nominal plate dimensions (d, bf, tf, w), ignoring the root fillets. This is conservative by roughly 2 % of area and keeps every quoted property reproducible without a handbook.