4.15.14. Isolator2spring Section¶
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.
unique section tag
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.
initial stiffness for lateral force-deformation
nominal yield strength for lateral force-deformation
nominal postyield stiffness for lateral force-deformation
nominal stiffness in the vertical direction
total height of elastomeric bearing
Euler Buckling load for the bearing
axial load at which nominal yield strength is achieved (optional)