Thesis (Ph.D.) - Cairo University - Faculty of Engineering - Department of Civil Engineering

Damping modification factor is used in international seismic codes for the design of structures with damping levels higher than 5% such as seismically isolated buildings. This study included deriving expressions for that factor using the data of local earthquakes in Egypt. The ground motions used in this study included 26 natural accelerograms and 150 artificial accelerograms. By comparing the derived expressions in this study with the values in two international codes and in previous studies, it was concluded that the natural earthquakes expressions are more recommended for addition to the Egyptian seismic provisions. The natural earthquakes expressions were used to design hypothetical baseisolated buildings lying in seismic zone (5) in Egypt. A seismic performance assessment was done for the designed base-isolated buildings using time history analyses and their responses were compared to their fixed-base counterparts showing an efficient performance for the studied base-isolated buildings

Issued also as CD