KikuchiAikenLRB Material: Difference between revisions
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(Created page with '{{CommandManualMenu}} This command is used to construct a uniaxial KikuchiAikenLRB material object. This material model produces nonlinear hysteretic curves of lead-rubber beari...') |
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| '''$hr ''' || total thickness of rubber '''[unit: m]''' | | '''$hr ''' || total thickness of rubber '''[unit: m]''' | ||
|- | |- | ||
| '''$gr ''' || | | '''$gr ''' || shear modulus of rubber '''[unit: N/m^2]''' | ||
|- | |- | ||
| '''$ap ''' || area of lead plug '''[unit: m^2]''' | | '''$ap ''' || area of lead plug '''[unit: m^2]''' | ||
|- | |- | ||
| '''$tp ''' || | | '''$tp ''' || yield stress of lead plug '''[unit: N/m^2]''' | ||
|- | |- | ||
| '''$alph ''' || | | '''$alph ''' || shear modulus of lead plug '''[unit: N/m^2]''' | ||
|- | |- | ||
| '''$beta ''' || | | '''$beta ''' || ratio of initial stiffness to yielding stiffness | ||
|- | |- | ||
| '''$temp ''' || | | '''$temp ''' || temperature '''[unit: °C]''' | ||
|- | |- | ||
| ''' $rk $rq ''' || | | ''' $rk $rq ''' || reduction rate for yielding stiffness ('''$rk''') and force at zero displacement ('''$rq''') | ||
|- | |- | ||
| '''$rs $rf''' || reduction rate for stiffness ('''$rs''') and force ('''$rf''') (see note 3) | | '''$rs $rf''' || reduction rate for stiffness ('''$rs''') and force ('''$rf''') (see note 3) | ||
Revision as of 07:58, 7 August 2013
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This command is used to construct a uniaxial KikuchiAikenLRB material object. This material model produces nonlinear hysteretic curves of lead-rubber bearings.
| uniaxialMaterial KikuchiAikenLRB $matTag $type $ar $hr $gr $ap $tp $alph $beta <-T $temp> <-coKQ $rk $rq> <-coMSS $rs $rf> |
| $matTag | integer tag identifying material |
| $type | rubber type (see note 1) |
| $ar | area of rubber [unit: m^2] |
| $hr | total thickness of rubber [unit: m] |
| $gr | shear modulus of rubber [unit: N/m^2] |
| $ap | area of lead plug [unit: m^2] |
| $tp | yield stress of lead plug [unit: N/m^2] |
| $alph | shear modulus of lead plug [unit: N/m^2] |
| $beta | ratio of initial stiffness to yielding stiffness |
| $temp | temperature [unit: °C] |
| $rk $rq | reduction rate for yielding stiffness ($rk) and force at zero displacement ($rq) |
| $rs $rf | reduction rate for stiffness ($rs) and force ($rf) (see note 3) |
NOTES:
1) Following rubber types for $type are available:
| 1 | lead-rubber bearing |
2) This material uses SI unit in calculation formula. Input arguments must be converted into [m], [m^2], [N/m^2].
3) $rs and $rf are available if this material is applied to multipleShearSpring (MSS) element. Recommended values are $rs=1/sum(i=0,n-1){ sin(n*i/pi)^2} and $rf=1/sum(i=0,n-1){sin(n*i/pi)}, where n is the number of springs in the MSS. For example, when n=8, $rs=0.2500 and $rf=0.1989.
EXAMPLE:
