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>'''
|}
|}


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|-
|-
| '''$Hkin''' || kinematic hardening modulus
| '''$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 | 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 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 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)


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Code Developed by: <span style="color:blue"> Michael H. Scott, Oregon State University </span>
Code Developed by: [http://web.engr.oregonstate.edu/~mhscott Michael H. Scott]

Latest revision as of 00:07, 25 February 2016




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