Limit State Material: Difference between revisions
No edit summary |
No edit summary |
||
| (4 intermediate revisions by the same user not shown) | |||
| Line 37: | Line 37: | ||
| '''$beta''' || power used to determine the degraded unloading stiffness based on ductility, m-b (optional, default=0.0) | | '''$beta''' || power used to determine the degraded unloading stiffness based on ductility, m-b (optional, default=0.0) | ||
|- | |- | ||
| '''$curveTag''' || an integer tag for the [[ | | '''$curveTag''' || an integer tag for the [[Limit Curve]] defining the limit surface | ||
|- | |- | ||
| '''$curveType''' || an integer defining the type of LimitCurve (0 = no curve, | | '''$curveType''' || an integer defining the type of LimitCurve (0 = no curve, | ||
| Line 53: | Line 53: | ||
EXAMPLE: | EXAMPLE: | ||
[[LimitStateMaterialExample]] | Original version of example: | ||
*[[LimitStateMaterialExample]] | |||
Debugged version of example: | |||
*[[LimitStateMaterialExampleDebugged]] | |||
Manual for the example: | |||
*[[Media: LimitStateMaterialManual.pdf| Limit State Material - Example Manual]] | |||
---- | ---- | ||
Latest revision as of 23:37, 19 July 2012
- Command_Manual
- Tcl Commands
- Modeling_Commands
- model
- uniaxialMaterial
- ndMaterial
- frictionModel
- section
- geometricTransf
- element
- node
- sp commands
- mp commands
- timeSeries
- pattern
- mass
- block commands
- region
- rayleigh
- Analysis Commands
- Output Commands
- Misc Commands
- DataBase Commands
This command is used to construct a uniaxial hysteretic material object with pinching of force and deformation, damage due to ductility and energy, and degraded unloading stiffness based on ductility. Failure of the material is defined by the associated Limit Curve.
| uniaxialMaterial LimitState $matTag $s1p $e1p $s2p $e2p $s3p $e3p $s1n $e1n $s2n $e2n $s3n $e3n $pinchX $pinchY
$damage1 $damage2 $beta $curveTag $curveType. |
| $matTag | integer tag identifying material |
| $s1p $e1p | stress and strain (or force & deformation) at first point of the envelope in the positive direction |
| $s2p $e2p | stress and strain (or force & deformation) at second point of the envelope in the positive direction |
| $s3p $e3p | stress and strain (or force & deformation) at third point of the envelope in the positive direction |
| $s1n $e1n | stress and strain (or force & deformation) at first point of the envelope in the negative direction* |
| $s2n $e2n | stress and strain (or force & deformation) at second point of the envelope in the negative direction* |
| $s3n $e3n | stress and strain (or force & deformation) at third point of the envelope in the negative direction* |
| $pinchX | pinching factor for strain (or deformation) during reloading |
| $pinchY | pinching factor for stress (or force) during reloading |
| $damage1 | damage due to ductility: D1(m-1) |
| $damage2 | damage due to energy: D2(Ei/Eult) |
| $beta | power used to determine the degraded unloading stiffness based on ductility, m-b (optional, default=0.0) |
| $curveTag | an integer tag for the Limit Curve defining the limit surface |
| $curveType | an integer defining the type of LimitCurve (0 = no curve,
1 = axial curve, all other curves can be any other integer) |
NOTES:
- negative backbone points should be entered as negative numeric values
EXAMPLE:
Original version of example:
Debugged version of example:
Manual for the example:
DESCRIPTION:
Modeling Failures in Existing Reinforced Concrete Columns by Ken Elwood: File:ElwoodCJCE2004.pdf
REFERENCES:
Elwood, K.J and Moehle, J.P., "Shake Table Tests and Analystical Studies on the Gravity Load Collapse of Reinforced Concrete Frames", Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA. PEER 2003/01.
Code Developed by: Ken Elwood, University of British Columbia