Bidirectional Section: Difference between revisions
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{| style="background:yellow; color:black; width:800px" | {| style="background:yellow; color:black; width:800px" | ||
| '''section Bidirectional $secTag $E $Fy $Hiso $Hkin''' | | '''section Bidirectional $secTag $E $Fy $Hiso $Hkin <$code1 $code2>''' | ||
|} | |} | ||
| Line 20: | Line 20: | ||
|- | |- | ||
| '''$Hkin''' || kinematic 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: | NOTES: | ||
* The bidirectional section is a suitable base isolator model and should be used in conjunction with a [[ZeroLengthSection]] element to this end. | * The implementation is a generalization of the uniaxial return map algorithm for rate independent plasticity (page 45, Simo and Hughes, 1998) with the same input parameters as the [[Hardening_Material | Hardening Material]] uniaxial material model. | ||
* The | * 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) | |||
---- | ---- | ||
Code Developed by: | Code Developed by: [http://web.engr.oregonstate.edu/~mhscott Michael H. Scott] | ||
Latest revision as of 00:07, 25 February 2016
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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) with the same input parameters as the Hardening Material uniaxial material model.
- 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