=8>7 So the beam will fail in deflection For stability, the clear distance from the free end of the cantilever the lateral restraint shall not exceed 25 b or
100b2
d
whichever is less. Consider nominal thickness = 40 mm Effective depth = 500 – 40 = 460 mm Clear Distance = 25 × 150 = 3750 mm or
100×1502
460
= 4891.3 mm Thus clear distance between the lateral restraints shall be 3750 mm. However the span is 4 m. So the beam fails from lateral stability consideration also.