QUESTION 1 [25 Marks] Floor construction of the office building in Figure 1 consists of 3 mm thick PVC floor tiles(16 kN

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: Question 1 25 Marks Floor Construction Of The Office Building In Figure 1 Consists Of 3 Mm Thick Pvc Floor Tiles 16 Kn 1 (31.45 KiB) Viewed 15 times

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QUESTION 1 [25 Marks] Floor construction of the office building in Figure 1 consists of 3 mm thick PVC floor tiles(16 kN/m²) laid over 19 mm cement screed (23 kN/m³), 12.5 mm lime-plaster ceiling finish(19 kN/m) on soffit, and light partitions. Assume 1 hour fire resistance, moderate exposure, fcu = 30 MPa. Consider both E-W & N-S spans. Assume Ø 12 mm and cover - 30 mm (a) Estimate the floor slab thickness (hint: Use Rules-of-thumb, fire requirement & span/depth ratios) (9) (b) Calculate Characteristic dead (Gn) and live loads (Qn) (5) (c) Calculate ULS & SLS design loads (4) (d) Draw the BMD labelling maximum moments at key points along the multi-span slab (7) 6m E-W beam FLOOR PLAN ELEVATION SEC XX Figure 1 G 3.5m 3.5m 35m 3.5m N-5 beam N Roof sen 4th 3rd 2nd Ged fr
QUESTION 2 [25 Marks) Figure 2 shows a vertical section through a simply supported, reinforced concrete staircase. The staircase is 1,45 m wide and is supported at both ends. The staircase must be able to withstand an imposed load of 2,5 kN/m² and will be cast monolithically. Use Grade 20 concrete with mild steel reinforcement. Calculate: (a) The total design, dead and imposed loads (factored) (hint: unit kN) (b) The maximum bending moment (3) (c) The value of the constant K and distance of lever arm (2) (Ø 12 mm and cover 25 mm) (7) (d) The size and spacing of suitable longitudinal reinforcement (e) The size of suitable transverse reinforcement (3) LANDING Span - 2000 Figure 2: Staircase TOTAL: 50 Marks UNISA 2022 160 FLOOR
QUESTION 1 [25 Marks] Floor construction of the office building in Figure 1 consists of 3 mm thick PVC floor tiles(16 kN/m³) laid over 19 mm cement screed (23 kN/m³), 12.5 mm lime-plaster ceiling finish(19 kN/m³) on soffit, and light partitions. Assume 1 hour fire resistance, moderate exposure, fcu = 30 MPa. Consider both E-W & N-S spans. Assume Ø 12 mm and cover = 30 mm (a) Estimate the floor slab thickness (hint: Use Rules-of-thumb, fire requirement & span/depth ratios) (9) (b) Calculate Characteristic dead (Gn) and live loads (Qn) (5) (c) Calculate ULS & SLS design loads (4) (d) Draw the BMD labelling maximum moments at key points along the multi-span slab (7) B 6m X 6m 6 m E-W beams FLOOR PLAN ELEVATION, SEC. X-X S ♥ (3) (2) 3.5m 3.5m 3.5m| 3.5m N-S beams 3.6m 3.6m 3.6m 3.6m 3.6m 3.6m --X Roof 5th 4th 3rd 2nd 1st Grd fir
QUESTION 2 [25 Marks] Figure 2 shows a vertical section through a simply supported, reinforced concrete staircase. The staircase is 1,45 m wide and is supported at both ends. The staircase must be able to withstand an imposed load of 2,5 kN/m² and will be cast monolithically. Use Grade 20 concrete with mild steel reinforcement. Calculate: (a) The total design, dead and imposed loads (factored) (hint: unit kN) (b) The maximum bending moment (8) (3) (c) The value of the constant K and distance of lever arm (Z) (Ø 12 mm and cover 25 mm) (7) (d) The size and spacing of suitable longitudinal reinforcement (e) The size of suitable transverse reinforcement (4) (3) LANDING 220 25 Span=2000 Figure 2: Staircase TOTAL: 50 Marks 160 FLOOR