Explanation: Vertical Stiffeners: Vertical stiffeners are provided to prevent buckling of the web due to diagonal compression. Some criteria regarding the design of vertical stiffness: The spacing between the vertical stiffness should be between 0.33 × d and 1.5 × d, d is the distance between flange angles,s, and where there is no flange angle, the distance between flanges ignoring fillets is taken. Outstand of web stiffener from the face of the web = Minimum Value = 12 tqε and Maximum Value = 20 tqε The greater unsupported clear dimension of the web panel should not be greater than 270 times the thickness of the web and the lesser unsupported clear dimension of the same web panel should not be greater than 180 times the thickness of the web.