A 3.0 m high concrete wall form has a design lateral pressure of 72 kPa at the base during pouring. If the wall is supported by 100 mm x 150 mm (nominal) SPF No. 2 studs spaced at 300 mm centres, what is the approximate maximum bending moment on a single stud near the base due to this pressure?

Question: A 3.0 m high concrete wall form has a design lateral pressure of 72 kPa at the base during pouring. If the wall is supported by 100 mm x 150 mm (nominal) SPF No. 2 studs spaced at 300 mm centres, what is the approximate maximum bending moment on a single stud near the base due to this pressure?

Answer options:

• 6.5 kN·m
• 3.2 kN·m ✅ 0.65 kN·m
• 0.21 kN·m

Correct answer: 0.65 kN·m

Explanation: The bending moment (M) on a stud can be estimated as M = P_avg × S × L²/8 for simply supported, or P_avg × S × L²/10-12 for continuous. Using a conservative point load equivalent approach for tributary width, M = (72 kN/m² * 0.3 m) * (3 m)² / 8 = 0.648 kN·m. A more precise calculation would integrate pressure over the height, but for a distributed load simplification, this is close enough given the options. This value must then be checked against the stud's bending capacity.