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Effects of near-fault and far-fault ground motions on nonlinear dynamic response and seismic damage of concrete gravity dams
Abstract As the forward directivity and fling effect characteristics of the near-fault ground motions, seismic response of structures in the near field of a rupturing fault can be significantly different from those observed in the far field. The unique characteristics of the near-fault ground motions can cause considerable damage during an earthquake. This paper presents results of a study aimed at evaluating the near-fault and far-fault ground motion effects on nonlinear dynamic response and seismic damage of concrete gravity dams including dam-reservoir-foundation interaction. For this purpose, 10 as-recorded earthquake records which display ground motions with an apparent velocity pulse are selected to represent the near-fault ground motion characteristics. The earthquake ground motions recorded at the same site from other events that the epicenter far away from the site are employed as the far-fault ground motions. The Koyna gravity dam, which is selected as a numerical application, is subjected to a set of as-recorded near-fault and far-fault strong ground motion records. The Concrete Damaged Plasticity (CDP) model including the strain hardening or softening behavior is employed in nonlinear analysis. Nonlinear dynamic response and seismic damage analyses of the selected concrete dam subjected to both near-fault and far-fault ground motions are performed. Both local and global damage indices are established as the response parameters. The results obtained from the analyses of the dam subjected to each fault effect are compared with each other. It is seen from the analysis results that the near-fault ground motions, which have significant influence on the dynamic response of dam–reservoir–foundation systems, have the potential to cause more severe damage to the dam body than far-fault ground motions.
Highlights A set of near-fault earthquakes with velocity pulse is used as seismic excitations. Dam–reservoir–foundation interaction is considered for dynamic response of the dam. Local and global damage indices are both established as the response parameters. Seismic damage of dams subjected to near and far-fault ground motions is discussed. Near-fault ground motion has the potential to cause more severe damage to the dam.
Effects of near-fault and far-fault ground motions on nonlinear dynamic response and seismic damage of concrete gravity dams
Abstract As the forward directivity and fling effect characteristics of the near-fault ground motions, seismic response of structures in the near field of a rupturing fault can be significantly different from those observed in the far field. The unique characteristics of the near-fault ground motions can cause considerable damage during an earthquake. This paper presents results of a study aimed at evaluating the near-fault and far-fault ground motion effects on nonlinear dynamic response and seismic damage of concrete gravity dams including dam-reservoir-foundation interaction. For this purpose, 10 as-recorded earthquake records which display ground motions with an apparent velocity pulse are selected to represent the near-fault ground motion characteristics. The earthquake ground motions recorded at the same site from other events that the epicenter far away from the site are employed as the far-fault ground motions. The Koyna gravity dam, which is selected as a numerical application, is subjected to a set of as-recorded near-fault and far-fault strong ground motion records. The Concrete Damaged Plasticity (CDP) model including the strain hardening or softening behavior is employed in nonlinear analysis. Nonlinear dynamic response and seismic damage analyses of the selected concrete dam subjected to both near-fault and far-fault ground motions are performed. Both local and global damage indices are established as the response parameters. The results obtained from the analyses of the dam subjected to each fault effect are compared with each other. It is seen from the analysis results that the near-fault ground motions, which have significant influence on the dynamic response of dam–reservoir–foundation systems, have the potential to cause more severe damage to the dam body than far-fault ground motions.
Highlights A set of near-fault earthquakes with velocity pulse is used as seismic excitations. Dam–reservoir–foundation interaction is considered for dynamic response of the dam. Local and global damage indices are both established as the response parameters. Seismic damage of dams subjected to near and far-fault ground motions is discussed. Near-fault ground motion has the potential to cause more severe damage to the dam.
Effects of near-fault and far-fault ground motions on nonlinear dynamic response and seismic damage of concrete gravity dams
Zhang, Sherong (author) / Wang, Gaohui (author)
Soil Dynamics and Earthquake Engineering ; 53 ; 217-229
2013-07-25
13 pages
Article (Journal)
Electronic Resource
English
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