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Development of Procedures to Enhance the Performance of Rehabilitated URM Buildings.


pdf icon Development of Procedures to Enhance the Performance of Rehabilitated URM Buildings. (8732 K)
Lizundia, B.; Holmes, W. T.; Longstreth, M.; Kren, A.; Abrams, D. P.

NIST GCR 97-724-1; 101 p. August 1997.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service
Order number: PB97-196901

Keywords:

rehabilitation; masonry; walls; earthquakes; damage; cost benefit analysis

Abstract:

The 1994 Northridge Earthquake provided a major test of the effectiveness of current rehabilitation methods for unreinforced masonry bearing wall (URM) buildings. A large sample of retrofitted URM buildings were shaken, many at high levels of ground motion, and a substantial amount of ground motion and damage data was collected. the majority of the strengthened buildings had been rehabilitated to the City of Los Angeles standards in Building Code Division 88 (1985), which is similar to others such as UBC (1994) and FEMA 178 (1992). These standards all aim to reduce the risk of life safety. This study was to develop procedures that can be used to enhance the performance of rehabilitated URM buildings. The report is organized into three sections in the main body of the report (NIST-GCR-97-721-1) and four appendices in a separate volume (NIST-GCR-970727-2), which address specific tasks in the study workplan. These tasks are: (1) analysis of the earthquake damage data, (2) applicability of current practice nationwide, (3) study of techniques to enhance the performance of URM walls, (4) benefit-cost considerations, and (5) development of procedures to enhance the performance of rehabilitated URM buildings.