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Introduction to yielding

The first limiting state to check in a beam is that of yielding. The yielding equations take in to account thestress on a member and the bending moment.

Equations to determine yielding

The flexural design strength as determined by the yielding limiting state is:

φ b M n

where:

φ b 0.90
M n M p

The plastic moment corresponds to:

M p F y Z 1.5 M y

where, the moment corresponding to onset of yielding at the extreme fiber from an elastic stress distribution is:

M y F y S
Z and S are given in Part 1 of the Manual for each member.

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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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