ABSTRACT
Design a 1.8 m high cantilever retaining wall, 215 mm thick, to resist a moment at the base of 9.4 kN m/m run with a shear force of 16.2 kN/m run. Blocks 440×215×215, hollow, of unit strength 7 N/mm2 with 55% solid
SOLUTION Cover required (Table 14) =40 mm
The ratio of span to effective depth of this wall should be checked. Effective span
For 7 N/mm2 block with 55% solid, the net strength=12.7 N/mm2, thus, ƒk=6.2 N/mm2 (Table 3(b))
The maximum design moment, Md, should not exceed that of the balanced section. Hence: Md
Consider now the required area of steel: Md
Therefore, use R12 every core (225 mm)=502 mm2/m run
Shear
Design shear force, V =16.2 kN/m run
Therefore, characteristic shear strength (Clause 19.1.3),
Therefore the wall has adequate resistance to shear.
