Introducing the link element option to define the translational and rotation spring and its stiffness property in between two element interface in Staad (member to member , plate to member , plate to plate).. For example, Glass Facade (plate element) is connected to the metal frame (member) through some rubbery silicone type element .The stiffness of the rubbery silicone connector would be factor to determine the response of the structure.
Thank you for posting this idea. So to be clear you would like an element which you define the stiffness in the 6 degrees of freedom as spring values which are applied directly to each end of the link object? Therefore the distance between the two connected points has no impact on the analysis. If your requirement is something different, then please provide details.