The 'intermediate transverse web stiffeners' in a plate girder (IS 800) are provided to:
Choose the correct answer
Reduce self-weight of girder
Increase shear capacity by permitting tension field action and preventing web shear buckling — spaced at 1–2× web depth
Provide composite action with slab
Improve thermal expansion accommodation
Correct Answer
B. Increase shear capacity by permitting tension field action and preventing web shear buckling — spaced at 1–2× web depth
Why is this the answer?
Plate girder web: slender web (d/tw > 67ε, IS 800) has reduced shear capacity — web buckles diagonally. Intermediate transverse stiffeners: (1) Increase shear capacity (post-buckling tension field action — diagonal tension in buckled web panels); (2) Prevent web buckling. Stiffener spacing: typically 1–2× web depth. Stiffener design: acts as column with web strip. Bearing stiffeners at ends/load points: transfer concentrated loads.
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