4.16.14. Isolator2spring SectionΒΆ
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section
('Isolator2spring', matTag, tol, k1, Fyo, k2o, kvo, hb, PE, Po=0.0) This command is used to construct an Isolator2spring section object, which represents the buckling behavior of an elastomeric bearing for two-dimensional analysis in the lateral and vertical plane. An Isolator2spring section represents the resultant force-deformation behavior of the bearing, and should be used with a zeroLengthSection element. The bearing should be constrained against rotation.
secTag
(int)unique section tag tol
(float)tolerance for convergence of the element state. Suggested value: E-12 to E-10. OpenSees will warn if convergence is not achieved, however this usually does not prevent global convergence. k1
(float)initial stiffness for lateral force-deformation Fyo
(float)nominal yield strength for lateral force-deformation k2o
(float)nominal postyield stiffness for lateral force-deformation kvo
(float)nominal stiffness in the vertical direction hb
(float)total height of elastomeric bearing PE
(float)Euler Buckling load for the bearing Po
(float)axial load at which nominal yield strength is achieved (optional)