UFC 4-023-03
25 January 2005
removed or modified. For Linear Static models, structural elements that can sustain a
constant moment while undergoing continued deformation must be modified through
insertion of an effective plastic hinge. Place a discrete hinge in the model at the location
of yielding and apply two constant moments, one at each side of the discrete hinge, in
the appropriate direction for the acting moment; see Figure 3-9. Determine the location
of the effective plastic hinge through engineering analysis and judgment or with the
guidance provided for the particular construction type. In Nonlinear Static and Dynamic
models, the software must have the ability to adequately represent the nonlinear flexural
response, after the internal moment reaches the flexural design strength of the element.
For structural elements that fail when the peak moment is reached and in all
three model types (Linear Static, Nonlinear Static and Nonlinear Dynamic), remove the
element when the internal moment exceeds the flexural design strength. Redistribute
the loads associated with the failed element per Section 3-2.4.3, before the analysis
continues.
Figure 3-9 Inserting Hinge and Moments into Linear Static Alternate Path Model
New Hinge
Column
Beam
ΦMn
ΦMn
Offset
After
Before
3-15
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