KikuchiAikenHDR
This command is used to construct a uniaxial KikuchiAikenHDR
material object. This material model produces nonlinear hysteretic curves of high damping rubber bearings (HDRs).
uniaxialMaterial KikuchiAikenHDR $matTag $tp $ar $hr
< -coGHU $cg $ch $cu >
< -coMSS $rs $rf >
matTag
|
integer tag identifying material |
tp
|
rubber type (see note 1) |
ar
|
area of rubber [unit: m^2] (see note 2) |
hr
|
total thickness of rubber [unit: m] (see note 2) |
|
correction coefficients for equivalent shear modulus ( |
|
reduction rate for stiffness ( |
Notes
Following rubber types for
tp
are available:X0.6
Bridgestone X0.6, standard compressive stress, up to 400% shear strain
X0.6-0MPa
Bridgestone X0.6, zero compressive stress, up to 400% shear strain
X0.4
Bridgestone X0.4, standard compressive stress, up to 400% shear strain
X0.4-0MPa
Bridgestone X0.4, zero compressive stress, up to 400% shear strain
X0.3
Bridgestone X0.3, standard compressive stress, up to 400% shear strain
X0.3-0MPa
Bridgestone X0.3, zero compressive stress, up to 400% shear strain
This material uses SI unit in calculation formula.
ar
andhr
must be converted into [m^2] and [m], respectively.rs
andrf
are available if this material is applied to multipleShearSpring (MSS) element. Recommended values arers
=1/sum(i=0,n-1){ sin(pii/n)^2} andrf
=1/sum(i=0,n-1){sin(pii/n)}, where n is the number of springs in the MSS. For example, whenn=8
,rs=0.2500
,rf=0.1989
.
Examples

Code Developed by: mkiku