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Question
Load - carrying stiffeners are provided _____ .
A.
to provide local reinforcement to a web under shear and bearing
B.
to transmit tensile forces applied to a web through a flange
C.
to prevent local buckling of the web due to concentrated loading
D.
to prevent local crushing of the web due to concentrated loading 
Answer ( Option C)

to prevent local buckling of the web due to concentrated loading

Solution

Stiffeners: Stiffeners are members or sections that are attached to beam webs or flanges to stiffen them against out-ofplane deformations. Stiffeners are used to make plate girders stiff or rigid. The main purpose of stiffeners in a plate girder is to prevent the buckling of the web. 
Different types of stiffeners: 
(1) Intermediate transverse web stiffener: To improve the buckling strength of a slender web due to shear.
(2) Load-carrying stiffener: To prevent local buckling of the web due to concentrated loading.
(3) Bearing Stiffener: To prevent local crushing of the web due to concentrated loading.
(4) Torsion stiffener: To provide torsional restraint to beams and girders at supports.
(5) Diagonal stiffener: To provide local reinforcement to a web under shear and bearing.
(6) Tension stiffener: To transmit tensile forces applied to a web through a flange.

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