4.14.5.28. KikuchiAikenHDR Material¶
- uniaxialMaterial('KikuchiAikenHDR', matTag, tp, ar, hr, <'-coGHU', cg, ch, cu>, <'-coMSS', rs, rf>)
This command is used to construct a uniaxial KikuchiAikenHDR material object. This material model produces nonlinear hysteretic curves of high damping rubber bearings (HDRs).
matTag
(int)integer tag identifying material
tp
(str)rubber type (see note 1)
ar
(float)area of rubber [unit: m^2] (see note 2)
hr
(float)total thickness of rubber [unit: m] (see note 2)
cg
ch
cu
(float)correction coefficients for equivalent shear modulus (
cg
), equivalent viscous daming ratio (ch
), ratio of shear force at zero displacement (cu
).rs
rf
(float)reduction rate for stiffness (
rs
) and force (rf
) (see note 3)
Note
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
= \(\frac{1}{\sum_{i=0}^{n-1}\sin(\pi*i/n)^2}\) andrf
= \(\frac{1}{\sum_{i=0}^{n-1}\sin(\pi*i/n)}\), where n is the number of springs in the MSS. For example, when n=8,rs
=0.2500,rf
=0.1989.
See also