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| {{CommandManualMenu}}
| | See '''''[http://opensees.berkeley.edu/wiki/index.php/BilinearOilDamper_Material BilinearOilDamper]''''' |
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| This command is used to construct a BilinearOilDamper material, which simulates the hysteretic response of bilinear oil dampers with a valve relief. Two adaptive iterative algorithms have been implemented and validated to solve numerically the constitutive equations within a bilinear oil damper with a high-precision accuracy.
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| {|
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| | style="background:lime; color:black; width:800px" | '''uniaxialMaterial BilinearOilDamper $matTag $K $Cd $alpha <$Fr $p> <$LGap> < $NM $RelTol $AbsTol $MaxHalf> '''
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| ----
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| {|
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| | style="width:150px" | '''$matTag ''' || integer tag identifying material
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| |-
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| | '''$K ''' || Elastic stiffness of linear spring (to model the axial flexibility of an oil damper (brace and damper portion)
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| | '''$Cd ''' || Viscous parameter of oil damper
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| |-
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| | '''$alpha ''' || Viscocity exponent
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| | '''$Fr ''' || Damper relief force (Damper property)
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| | '''$p ''' || Post-relief damping coefficient ratio (Damper property)
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| | '''$LGap ''' || gap length to simulate the gap length due to the pin tolerance
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| | '''$NM ''' || Employed adaptive numerical algorithm (default value NM = 1; 1 = Dormand-Prince54, 2=adaptive finite difference)
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| | '''$RelTol ''' || Tolerance for absolute relative error control of the adaptive iterative algorithm (default value 10^-6)
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| | '''$AbsTol ''' || Tolerance for absolute error control of adaptive iterative algorithm (default value 10^-6)
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| | '''$MaxHalf ''' || Maximum number of sub-step iterations within an integration step (default value 15)
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| |}
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| ----
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| '''Examples:'''
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| ----
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| '''References''':
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| {|
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| | style="width:5px" | '''[1]''' || Akcelyan, S., and Lignos, D.G. (2015), “Adaptive Numerical Method Algorithms for Nonlinear Viscous and Bilinear Oil Damper Models Under Random Vibrations”, ASCE Journal of Engineering Mechanics, (under review).
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| |}
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| Code Developed and Implemented by : <span style="color:blue"> '''''[http://dimitrios-lignos.research.mcgill.ca/PAkcelyan.html Sarven Akcelyan]''''' & '''''[http://dimitrios-lignos.research.mcgill.ca/PLignos.html Prof. Dimitrios G. Lignos]''''', (McGill University) </span>
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