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Abstract
This paper describes a multi-tiered loss assessment methodology to estimate seismic monetary implications resulting from structural damage to the building population in Greater Cairo. After outlining a ground-shaking model, data on geological structures and surface soil conditions are collated using a considerable number of boreholes to produce a classification of different soil deposits. An inventory database for the existing building stock is also prepared. The seismic vulnerability of representative reinforced concrete building models, designed according to prevalent codes and construction practices, is evaluated. Capacity spectrum methods are utilised for assessing the structural performance through a multi-level damage scale. A simplified methodology for deriving fragility curves for non-ductile reinforced concrete building classes that typically constitute the building population of the city is adopted. In addition, suitable fragility functions for unreinforced masonry constructions are selected and used for completing the loss model for the study area. The results are finally used to build an event-based loss model caused by possible earthquakes in the region.
Acknowledgements
The input and support provided by Mr R. Annass and Dr S. Sherif in the attainment of satellite and aerial photos, coordinating field survey results with these images, and providing design drawings for typical RC buildings are gratefully acknowledged. The contribution of other experts from Egypt in the earlier part of the study for building-up a ground-shaking model for the area, including Dr M. Sheta and Dr H. El-Marsafawy of Ardaman-ACE, and Dr A. Deif of the Helwan Institute of Astronomy and Geophysics, is also acknowledged with gratitude. The authors are grateful to the anonymous reviewers for their constructive and insightful comments.