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What is web crippling ?(a) web is of large thickness(b) flange near portion of stress concentration tends to fold over web(c) web near portion of stress concentration tends to fold over flange(d) flange is of large thicknessThe question was posed to me during an interview.My question is taken from Web Buckling & Crippling topic in portion Design of Beams of Design of Steel Structures

Answer»

Correct answer is (c) web near portion of stress CONCENTRATION tends to FOLD over flange

The explanation: Webs of rolled SECTION are subjected to LARGE amount of stresses just below CONCENTRATED loads and above reactions from support. Stress concentration occurs at junction of web and flange. As a result, large bearing stresses are developed below concentrated load. Consequently, the web near portion of stress concentration tends to fold over flange. This type of local buckling phenomenon is called crippling or crimpling of web.



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