In a plate girder web, the tension field action (post-buckling) is utilised in IS 800 by:
Choose the correct answer
Increasing flange area only
Allowing diagonal tension in web after initial shear buckling (tension field theory)
Adding horizontal stiffeners only
Reducing web thickness
Correct Answer
B. Allowing diagonal tension in web after initial shear buckling (tension field theory)
Why is this the answer?
Tension field action: after web shear buckling, diagonal tension develops in the web (like a truss). IS 800 accounts for post-buckling strength through tension field (clause 8.3). Transverse stiffeners convert tension field forces to compression in stiffeners (analogous to truss diagonals and verticals). Increases shear capacity beyond pure elastic buckling.
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