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Introduction to fracture

The limit state of fracture must be considered in tension members to prevent failure from breaking. "To prevent fracture, thestress on the net section must be less than the tensile strength F u ."

Equations for fracture

φ t 0.75
P n F u A e

The resistance factor is smaller for fracture than it was for yielding because failure in fracture is more sudden and seriousthan in yielding. Here the design strength of the tension members is φ t P n where:

  • A e = effective net area, in. 2
  • F u = specified minimum tensile stress, ksi

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Source:  OpenStax, Steel design (civi 306). OpenStax CNX. Jan 22, 2004 Download for free at http://cnx.org/content/col10153/1.3
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