If 'd' is depth of web and ' {t}_{w} ' is thickness of web of a plate girder such that {d}/{t_{w}} \leq 400 \\epsilon_{w}, where \\epsilon_{w}=\sqrt{{250}/{f_{y}}}, then:

end bearing stiffeners, intermediate transverse stiffeners and longitudinal stiffeners at 0.2d from compression face are needed

intermediate transverse stiffeners are needed in addition to end bearing stiffeners

only end bearing stiffeners are needed

SSC JE Civil Engineering 29-Oct-2020 Shift 1 Paper

Question : 109 of 200

Marks: +1, -0

If 'd' is depth of web and '

{t}_{w}

' is thickness of web of a plate girder such that

{d}/{t_{w}} ≤ 400 \ε_{w}

, where

\ε_{w}=√{{250}/{f_{y}}}

, then:

end bearing stiffeners, intermediate transverse stiffeners and longitudinal stiffeners at 0.2d from compression face are needed
intermediate transverse stiffeners are needed in addition to end bearing stiffeners
end bearing stiffeners, intermediate transverse stiffeners, longitudinal stiffeners at 0.2d from compression face and at neutral axis are needed
only end bearing stiffeners are needed

Validate

Solution:

Transverse Stiffeners are provided to increase buckling resistance of the web due to inclined compressive stress due to shear, It is provided vertically along the span.

Horizontal Stiffener / Longitudinal Stiffener is designed to prevent web buckling due to bending compression.

Both traverse and longitudinal stiffeners are provided to check the web buckling.

End Bearing Stiffeners are provided at the supports & Load Bearing Stiffeners are provided at the points of concentrated loads.

Important Point:

{d}/{t_{W}}<67 \ε

⇒ unstiffened girder can be designed i.e. No girder required.
If

85 \ε<{d}/{t_{W}}<200 \ε

⇒ Vertical stiffener (C1 and C2) may be provided.
If

200 \ε<{d}/{t_{W}}<250 \ε

⇒ Vertical stiffener along with longitudinal stiffener at

0.2 {\d}

may be provided.
If

250 \ε<{d}/{t_{W}}<345 \ε

⇒ Vertical stiffeners along with two longitudinal stiffeners at

0.2 {\d}

and

0.5 {\d}

respectively may be provided.
If

{d}/{t_{W}} ≤ 400 \ε

⇒ End bearing stiffeners, intermediate transverse stiffeners, longitudinal stiffeners at

0.2 {\d}

from compression face and at neutral axis are needed.

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