cameroon gce advanced level 2025 building construction applied mechanics 3

Part One: Reinforced Concrete

• Structure: One-storey building with an upper and ground floor. The ground floor is a slab, while the upper floor is made of a reinforced concrete hollow block slab.
• Beams: 20 x 40 cm.
• Hollow Block Slab: 16 cm thick hollow blocks with 4 cm of reinforced concrete topping. The total thickness of the slab is 20 cm.
• Pillars: 20 x 30 cm.
• Span between pillars 2 and 3: 8.40 m.

Mechanical Data

• Density of concrete (
  $$\rho$$

  b): 25 kN/m$$^3$$

• Hollow block floor (16+4) (
  $$\gamma$$

  ): 3 kN/m$$^2$$

• Strength of concrete (fcd): 20 MPa
• Live load (q): 3 kN/m$$^2$$
• Strength of steel (fe): 400 MPa
• Safety coefficient of concrete (
  $$\gamma$$

  b): 1.5

• Safety coefficient of steel (
  $$\gamma$$

  s): 1.15

Part Two: Strength of Materials

• Task: Transporting fresh mixed concrete and two workers on a platform mounted on a scaffold.
• Resultant Force (R): 12 kN.
• Scaffold Dimensions: The vertical members are 1.00 m high and the base is 1.00 m wide (0.50 m from the center to each side). The scaffold is symmetrical.
• Given: The resultant force (R) of the workers and fresh concrete is 12 kN.