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A hot-wet allowable is \( 0.80 \) of the room-temperature dry value of \( 500 \) MPa. The design allowable is

  • A.400 MPa
  • B.625 MPa
  • C.450 MPa
  • D.300 MPa

Answer: A

Multiplying, \( 0.80 \times 500 = 400 \) MPa. The knock-down reflects moisture absorbed over years of service combined with the highest temperature the structure will see, and it applies chiefly to matrix-dominated properties.

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