As per Is 456:2000,
26.5.1.3 Side face reinforcement:
Where the depth of the web in a beam exceeds750mm, side face reinforcement shall be provided along the two faces. The total area of such reinforcement shall be not less than 0.1 percent of the web area and shall be distributed equally on two faces at a spacing not exceeding 300 mm or web thickness whichever is
less.