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This command is used to construct an axial limit curve object that is used to define the point of axial failure for a LimitStateMaterial object. Point of axial failure based on model from Chapter 3. After axial failure response of LimitStateMaterial is forced to follow axial limit curve.
limitCurve Axial $curveTag $eleTag $Fsw $Kdeg $Fres $defType $forType <$ndI $ndJ $dof $perpDirn $delta>.
$curveTag |
unique limit curve object integer tag |
$eleTag |
integer element tag for the associated beam-column element |
$Fsw |
floating point value describing the amount of transverse reinforcement (Fsw = Astfytdc/s) |
$Kdeg |
floating point value for the slope of the third branch in the post-failure backbone, assumed to be negative (see Figure 4-6) |
$Fres |
floating point value for the residual force capacity of the post-failure backbone (see Figure 4-6) |
$defType |
integer flag for type of deformation defining the abscissa of the limit curve |
$forType |
integer flag for type of force defining the ordinate of the limit curve* |
$ndI |
integer node tag for the first associated node |
$ndJ |
integer node tag for the second associated node |
$dof |
nodal degree of freedom to monitor for drift** |
$perpDirn |
perpendicular global direction from which length is determined to compute drift** |
$delta |
drift (floating point value) used to shift axial limit curve |
NOTE: * Options 1 and 2 assume no member loads.
** 1 = X, 2 = Y, 3 = Z
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