Methodology for Mitigation of Seismic Hazards in Existing Unreinforced Masonry Buildings: The Methodology (Revised)

摘要

This report presents a methodology for the mitigation of seismic hazards in existing unreinforced masonry (URM) buildings. Attention is focused on selection of the seismic risk zone, and on design spectra for seismic hazard reduction. A procedure for field surveys of existing URM buildings is recommended and the response of existing structural systems to earthquakes is considered. Methodologies for mitigating seismic hazard in areas of design ground motion of effective peak acceleration of .1G, .2G, and .4G are presented. The philosophy used to develop recommended capacities of existing materials is discussed and the methodology is compared to current seismic reduction requirements.