SEISMIC RESISTANCE OF A HYBRID SHEARWALL SYSTEM Vom Fachbereich 13 - Bauingenieurwesen der Technischen Universität Darmstadt zur Erlangung der Würde eines Doktor Ingenieurs (Dr.-Ing.) genehmigte DISSERTATION vorgelegt von N. Mohammad Shirali ( M. Sc. ) aus Bander-e-turkman, Iran Darmstadt 2002 D 17 Referent: Prof. Dr.–Ing. Jörg Lange Korreferent: Prof. Ir. Jack G. Bouwkamp Tag der Einreichung: 15.03.2002 Tag der mündlichen Prüfung: 29.05.2002 ABSTRACT SEISMIC RESISTANCE OF A HYBRID SHEARWALL SYSTEM Shirali, N. Mohammad, Ph. D. in Structural Engineering, May, 2002, 125 Pages Keywords: Hybrid structure, Shear wall , Earthquake design, Interface connection, Shear strength, Cyclic loads, Finite element method, Nonlinear response, Concrete, Steel, Composite Earthquake design of buildings involves the creation of a structural system capable of re-sisting the seismic forces in a ductile manner. Postearthquake observations have shown that the failure of many reinforced concrete buildings has been due to the inability of the lower-story columns to resist the earthquake imposed loads.