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The strength of the beams with openings may be governed by plastic deformations due to

(a) moment only

(b) shear only

(c) both moment and shear

(d) does not depend on moment or shear

The question was asked in final exam.

This interesting question is from Deflection & Holes in Beams topic in chapter Design of Beams of Design of Steel Structures

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Right option is (c) both moment and shear

Explanation: The strength of the beams with openings may be governed by plastic deformations due to both moment and shear at the openings. The strength realised will depend upon the interaction between moment and shear. The reduction in moment capacity at the openings is small while the reduction in shear capacity may be significant.

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