Ductility Demand Estimation Methods at Structural System Level for Seismic Design of Structures

The ductility demand for seismic design of a single degree of structure or an individual structural member can be determined easily. However, there is no established method to determine the ductility demand far a structural system. The object of this paper is to develop a method for the estimation of the ductility demand far structural systems, in which the inelastic behavior can be taken into account properly. The validity of the proposed method has been examined far several cases with different structures and different earthquake excitations. The method is also compared with two alternative methods.