[科研][软件][OpenSees] OSSCTest: OpenSees SelfCentering Material Test [OpenSees SelfCentering 旗帜型滞回模型测试]

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程序图标 ( Icon )

程序介绍 ( Introduction)

应网友的要求，编写OpenSees中的SelfCenteringMaterial本构测试程序，关于SelfCenteringMaterial的介绍在OpenSees Wiki中找到：SelfCentering Material – OpenSeesWiki (berkeley.edu)

其命令也贴到下面：

This command is used to construct a uniaxial self-centering (flag-shaped) material object with optional non-recoverable slip behaviour and an optional stiffness increase at high strains (bearing behaviour).

This material is primarily used to model a self-centering energy-dissipative (SCED) brace (Christopoulos et al., 2008) with the option to model the slippage of an external friction fuse (which causes non-recoverable deformation above a given brace strain). In practice, the external friction fuse is used to limit the amount of force in the brace (since the post-activation stiffness is generally non-zero). The bearing option is used to approximately model the effect of bolt bearing in the brace or external fuse mechanisms, which causes a steep increase in the stiffness of the brace. For self-centering energy-dissipative brace design, this bearing effect model may be used to impose a limit on slip or activation strain based on the anticipated available strain capacity of the mechanism. Note that this bearing effect is only intended to be a flag to indicate the existence of bearing; the SCED brace system should be designed such that the brace will not experience such bearing in practice.

This material type could potentially be used for any comparable self-centering system that exhibits a flag-shaped hysteretic response (for example: rocking wall systems if the uniaxial material is used as a moment/rotation hysteresis).

uniaxialMaterial SelfCentering $matTag $k1 $k2 $sigAct $beta <$epsSlip> <$epsBear> <rBear>

`$matTag`	`integer tag identifying material`
`$k1`	`Initial Stiffness`
`$k2`	`Post-Activation Stiffness (0<$k2<$k1)`
`$sigAct`	`Forward Activation Stress/Force`
`$beta`	`Ratio of Forward to Reverse Activation Stress/Force`
`$epsSlip`	`slip Strain/Deformation (if $epsSlip = 0, there will be no slippage)`
`$epsBear`	`Bearing Strain/Deformation (if $epsBear = 0, there will be no bearing)`
`$rBear`	`Ratio of Bearing Stiffness to Initial Stiffness $k1`