Development of Procedures to Enhance the Performance of Rehabilitated URM Buildings.
Development of Procedures to Enhance the Performance of
Rehabilitated URM Buildings.
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,
Available from: National Technical Information Service
Order number: PB97-196901
rehabilitation; masonry; walls; earthquakes; damage;
cost benefit analysis
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.