Bidirectional Section: Difference between revisions
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NOTES: | NOTES: | ||
* The implementation is a generalization of the uniaxial return map algorithm for rate independent plasticity (page 45, Simo and Hughes, 1998) | * The implementation is a generalization of the uniaxial return map algorithm for rate independent plasticity (page 45, Simo and Hughes, 1998) | ||
* The bidirectional section is a suitable base isolator model and should be used in conjunction with a [[ZeroLengthSection_Element | ZeroLengthSection]] element to this end. It can also be used in a nonlinear beam element to define stress resultant plasticity. | * The bidirectional section is a suitable base isolator model and should be used in conjunction with a [[ZeroLengthSection_Element | ZeroLengthSection]] element to this end. It can also be used in a nonlinear beam element to define stress resultant plasticity at an integration point. | ||
* The optional code1 and code2 values correspond to the beam cross-section analogy with respect to the local axes of the calling element (P, Vy, and Vz = force along section local x, y, and z axes, respectively; T, My, and Mz = moment about section local x, y, and z axes, respectively) | * The optional code1 and code2 values correspond to the beam cross-section analogy with respect to the local axes of the calling element (P, Vy, and Vz = force along section local x, y, and z axes, respectively; T, My, and Mz = moment about section local x, y, and z axes, respectively) | ||
Revision as of 23:42, 24 February 2016
- 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 allows the user to construct a Bidirectional section, which is a stress-resultant plasticity model of two coupled forces. The yield surface is circular and there is combined isotropic and kinematic hardening.
| section Bidirectional $secTag $E $Fy $Hiso $Hkin <$code1 $code2> |
| $secTag | unique section tag |
| $E | elastic modulus |
| $Fy | yield force |
| $Hiso | isotropic hardening modulus |
| $Hkin | kinematic hardening modulus |
| $code1 | section force code for direction 1 (default = Vy) |
| $code2 | section force code for direction 2 (default = P) |
NOTES:
- The implementation is a generalization of the uniaxial return map algorithm for rate independent plasticity (page 45, Simo and Hughes, 1998)
- The bidirectional section is a suitable base isolator model and should be used in conjunction with a ZeroLengthSection element to this end. It can also be used in a nonlinear beam element to define stress resultant plasticity at an integration point.
- The optional code1 and code2 values correspond to the beam cross-section analogy with respect to the local axes of the calling element (P, Vy, and Vz = force along section local x, y, and z axes, respectively; T, My, and Mz = moment about section local x, y, and z axes, respectively)
Code Developed by: Michael H. Scott, Oregon State University