NEHRP Clearinghouse
- Title
- Seismic Performance of Underground Water Pipelines in the Southeast San Fernando Valley in the 1971 San Fernando Earthquake.
- File
- PB293562.pdf
- Author(s)
- Isenberg, J.
- Source
- National Science Foundation, Washington, DC. Applied Science and Research Applications., September 1978, 67 p.
- Identifying Number(s)
- R-7848
- Abstract
- This study examines the seismic performance of underground water pipelines in the southeast San Fernando Valley in the 1971 San Fernando earthquake. Studies were reported on the effects of corrosion on leaks in pipelines, made of steel and cast iron, that were damaged in regions where ground shaking was dominated by wave propagation. The present investigation extends previous work by considering a larger region of the southeastern San Fernando Valley where wave effects dominate ground shaking. It is part of the East Valley District of the Los Angeles Department of Water and Power and covers about 30 square miles which includes 71 main leak locations. The findings show that corrosion is a major factor in determining where leaks occur in areas undergoing ground shaking as well as under normal conditions. There are strong indications that the effects of ground shaking on pipelines continued in San Fernando Valley for several years after the earthquake. Included is a section on local geography.
- Keywords
- Damage assessment; Seismic waves; California; San Fernando Valley; Subsurface structures; Earth movements; Ground motion; Earthquake engineering; Water pipelines; Leakage; Earthquakes; Dynamic structural analysis