Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

Procedures for the three-dimensional (3-D) dynamic analysis of earth dams have been available for over 25 years. However, additional case histories are needed to assess whether such procedures are capable of simulating the seismic response of dams in narrow canyons, and to further evaluate the effects of 3-D behavior on the response of such dams. This study was aimed at identifying the vibration characteristics of Seven Oaks Dam during the 2005 Yucaipa and 2001 Big Bear Lake earthquakes, and at evaluating the applicability of 3-D and 2-D numerical procedures to simulate the response of the dam. Accelerograms recorded on the dam, in bedrock at the dam site, and in the free field downstream were analyzed to identify the predominant frequencies of vibration of the structure during the earthquakes. A 3-D model of the structure and its foundation was developed based on dam design data, including field and laboratory test data on material properties. Using the motions recorded in the free field as input, 3- D and (2-D) dynamic response analyses were performed to calculate the motions throughout the dam and its foundation. Parametric analyses were performed to evaluate the sensitivity of the calculated dam response to various input assumptions.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

3D Analysis of the Seismic Response of Seven Oaks Dam

San Diego, California

Procedures for the three-dimensional (3-D) dynamic analysis of earth dams have been available for over 25 years. However, additional case histories are needed to assess whether such procedures are capable of simulating the seismic response of dams in narrow canyons, and to further evaluate the effects of 3-D behavior on the response of such dams. This study was aimed at identifying the vibration characteristics of Seven Oaks Dam during the 2005 Yucaipa and 2001 Big Bear Lake earthquakes, and at evaluating the applicability of 3-D and 2-D numerical procedures to simulate the response of the dam. Accelerograms recorded on the dam, in bedrock at the dam site, and in the free field downstream were analyzed to identify the predominant frequencies of vibration of the structure during the earthquakes. A 3-D model of the structure and its foundation was developed based on dam design data, including field and laboratory test data on material properties. Using the motions recorded in the free field as input, 3- D and (2-D) dynamic response analyses were performed to calculate the motions throughout the dam and its foundation. Parametric analyses were performed to evaluate the sensitivity of the calculated dam response to various input assumptions.