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16-Civ-B2 Advanced Structural Design: December 2017

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

  1. Question 1 Plastic design of the rigid steel frame and its welded corner
  2. Question 2 Beam-column check of member ABC and the footing at A
  3. Question 3 Plate girder for flexure, shear and their interaction
  4. Question 4 Composite steel–concrete bridge cross-section and shear connectors
  5. Question 5 Prestressed concrete girder with no tension in the cross-section
  6. Question 6 Limit states design of the reinforced concrete member ABC
  7. Question 7 Member ABC as a beam-column, and the long-term deflection at B

Start with Question 1 →

Paper format. National Exams, December 2017, 16-Civ-B2 Advanced Structural Design — 3 hours, open book (design handbooks and textbooks permitted). Seven design questions of equal value; any five constitute a complete paper. All seven are solved here because the set is a study resource. Page 1 supplies the design data used throughout: concrete $f'_c = 30$ MPa; structural steel $F_y = 350$ MPa; rebar $f_y = 400$ MPa; prestressed concrete $f_{ci} = 35$ MPa at transfer, $f'_c = 50$ MPa, $n = 6$, $f_{ult} = 1750$ MPa, $f_{py} = 1450$ MPa, $f_{initial} = 1200$ MPa, losses $= 240$ MPa. Page 1 also states that all loads shown are unfactored.

Reference texts. CSA S16:19 Design of Steel Structures (Cl 8.5, 13.4, 13.6, 13.8, 14.3–14.6, 17); CISC Handbook of Steel Construction, 11th ed.; CSA A23.3:19 Design of Concrete Structures (Cl 9.8, 10, 11, 15, 18); CSA S6:19 Canadian Highway Bridge Design Code; Kulak & Grondin, Limit States Design in Structural Steel, 10th ed.; MacGregor & Bartlett, Reinforced Concrete: Mechanics and Design (Canadian ed.); Collins & Mitchell, Prestressed Concrete Structures.

Check: load factors. The paper states only that the loads are unfactored and gives no dead/live split. Throughout, the printed loads are taken as one variable-load case and factored by $1.5$, while self weight that the solver introduces (concrete frames, the prestressed girder, the bridge deck) is factored by $1.25$, per NBCC 2020 Table 4.1.3.2. The mechanisms, section classifications and interaction equations are unaffected by that choice; only the magnitudes scale.