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The elastic section modulus differs from the plastic section modulus in that the plastic value assumes

  • A.The material is brittle
  • B.The whole section has yielded
  • C.The section remains fully elastic
  • D.Only the extreme fibre has yielded

Answer: B

The plastic modulus is the first moment of the two half-areas about the equal-area axis, corresponding to a fully plastic hinge. It exceeds the elastic value, and the ratio between them is the shape factor, about 1.5 for a rectangle.

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