Effects of near-fault and far-fault ground motions on nonlinear dynamic response and seismic damage of concrete gravity dams |
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| Institution: | 1. Department of Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, USA;2. Iranian National Committee on Large Dams, Tehran, Iran;3. Department of Civil Engineering, Ryerson University, 350 Victoria St., Toronto, ON, Canada M5B 2K3;1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2. Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027, USA;3. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Hydraulic Engineering, Dalian University of Technology, Dalian 116023, China;3. State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116023, China;1. Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino, 1 ? 56126 Pisa, Italy;2. Department of Energy, Systems, Territory and Constructions Engineering, University of Pisa, Largo Lucio Lazzarino, 1 ? 56126 Pisa, Italy;3. Institute for Scientific Computing, Technische Universität Braunschweig, Mühlenpfordtstrasse, 23 – 38106 Braunschweig, Germany |
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| 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. |
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| Keywords: | Concrete gravity dams Nonlinear dynamic analysis Seismic damage Concrete damaged plasticity (CDP) model Near-fault ground motions Far-fault ground motions Dam–reservoir–foundation interaction Damage index |
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