Symmetric linear curve - lin_sym

This is a curve frequently employed to model idealised linear behaviour, soil/foundation flexibility, laminated-rubber bearings (if their usually low viscous damping is ignored), etc. A single parameter needs to be defined:

Stiffness (K0)
The default value is 10000

Note: In previous releases of SeismoStruct, link elements featuring this response curve were typically employed to model pinned joints (zero stiffness) and/or Constraints. However, users may now use the Equal DOF facility (see Constraints) to achieve the same objective; e.g. a pin/hinge may be modelled by introducing an 'Equal DOF' constrain defined for translation degrees-of-freedom only.