SEISMIC RISK ASSESSMENT OF LEVEES
Keywords:Seismic analyses, risk assessment, logic tree, embankment, levee, dynamic response, slope deformation
AbstractA seismic risk assessment procedure for earth embankments and levees is presented. The procedure consists of three major elements: (1) probability of ground motion at the site, (2) probability of levee failure given a level of ground motion has occurred and (3) expected loss resulting from the failure. This paper discusses the first two elements of the risk assessment. The third element, which includes economic losses and human casualty, will not be presented herein. The ground motions for risk assessment are developed using a probabilistic seismic hazard analysis. A two-dimensional finite element analysis is performed to estimate the dynamic responses of levee, and the probability of levee failure is calculated using the levee fragility curve. The overall objective of the assessment is to develop an analytical tool for assessing the failure risk and the effectiveness of various levee strengthening alternatives for risk reduction. An example of the procedure, as it applies to a levee built along the perimeter of an island for flood protection and water storage, is presented. Variations in earthquake ground motion and soil and water conditions at the site are incorporated in the risk assessment. The effects of liquefaction in the foundation soils are also considered.
How to Cite
LicenseAuthors who publish with this journal agree to the following terms:
- Authors retain the copyright and publishing right, and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) followingthe publication of the article, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).