Frequency Domain Spectral Analysis of Arch Dams under Random Seismic Excitation
Publication: Practice Periodical on Structural Design and Construction
Volume 29, Issue 4
Abstract
Previous research on seismic response analysis of dams primarily treated earthquakes as deterministic events; only a few studies on arch dams have explored earthquakes as random processes. This study introduces a three-dimensional seismic analysis of the Morrow Point arch dam, considering fully correlated random ground motion. The random ground excitation is characterized by the power spectral density function (PSDF) of the Kern County earthquake, for which the response time history is available. The spectral analysis technique describes the PSDF of the dam’s response using the desired transfer function derived from Abaqus software. The analysis method is similar to that employed in finding the PSDF of the response of offshore structures from a given wave spectrum (PSDF). The method is validated by confirming the results of the proposed method with those of modal spectral analysis for empty dams and those of the time history analysis of the full reservoir dam. The results from the numerical study show that (1) the PSDF of responses obtained by modal spectral analysis using the first ten modes of the dam matches with those obtained by the direct analysis using transfer functions for the empty dam; and (2) mean peak arch stresses increases along the height of the dam from base to top, whereas mean peak cantilever stresses decreases; further, the mean peak arch stresses are less than the mean peak cantilever stresses at the base.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Information & Authors
Information
Published In
Practice Periodical on Structural Design and Construction
Volume 29 • Issue 4 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jan 31, 2024
Accepted: Apr 29, 2024
Published online: Jul 15, 2024
Published in print: Nov 1, 2024
Discussion open until: Dec 15, 2024
ASCE Technical Topics:
- Analysis (by type)
- Arch dams
- Dams
- Disaster risk management
- Disasters and hazards
- Earthquake engineering
- Earthquakes
- Engineering fundamentals
- Engineering mechanics
- Geohazards
- Geotechnical engineering
- Hydraulic engineering
- Hydraulic structures
- Material mechanics
- Materials engineering
- Modal analysis
- Natural disasters
- Power spectral density
- Seismic effects
- Seismic tests
- Statistical analysis (by type)
- Stress (by type)
- Stress analysis
- Structural analysis
- Structural engineering
- Structures (by type)
- Tests (by type)
- Water and water resources
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