S,<num>,<group>,<elem>,<bbc>,<disp>,<force>

This command adds nonlinear properties to springs. This command does not add any element to the model. This command adds nonlinear model information to a spring defined with E command.

• num - nonlinear spring number
• group - group number
• elem - element number
• bbc - backbone curve number
• disp - displacement type
• force - force option