The NLLink option of SAP2000 was used to model the TMD. With the use of simple formulas, the 730-ton steel ball which hangs from floor 92-88 (11.5m), it can be transformed to a mass (which is pinned) attached to the mass of the top floor via a spring of an equivalent stiffness and a dashpot connected in parallel, in order to model the damping of the damper itself.