Seismic Resistance of an Elevated Water Tank—A Case Study

by M. Anoushiravani, Portland Water Bur, Portland, OR, USA,
C. G. Bader, Portland Water Bur, Portland, OR, USA,
D. H. Cornforth, Portland Water Bur, Portland, OR, USA,

Abstract: Current knowledge of earthquake risk and structural response has raised concern about the safety of elevated water storage tanks which were constructed several decades ago. This paper describes a study which was performed to evaluate the response of such a tank to a maximum credible earthquake (MCE). The major points that will be covered in the paper include: The development of a recommended design earthquake event; A review of the influence of the vibration of liquids in the tank on the structure's response to earthquake motions; The strength and stability of the tank; Methods to upgrade the tanks ability to withstand the MCE without catastrophic failure. The objective of the paper is to provide the design engineer with an example for conducting earthquake resistance investigations of similar elevated water storage tanks.

Subject Headings: Water tanks | Earthquakes | Structural safety | Water storage | Storage tanks | Structural response | Seismic design | Failure analysis

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