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Evaluation of the Performance of Accelerogram Selection Methods in Reducing the Dispersion of Dynamic Analysis Results in Homogeneous Earth Dam
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Ashkan Gholipoor Noroozi   , Naser Poursaeid , Sadegh Sadeghi |
| Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran , ashkan.gholipoornoroozi@iau.ir |
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Abstract: (5 Views) |
In earthquake engineering, methods are proposed to select accelerograms which can reduce the dispersion of results by increasing the spectral similarity of records with design spectrum. In this study, the performance of four selected methods, namely mean spectral deviation, spectral adaptation, spectral equilibrium, and spectral intensity, was evaluated in respect of the reduction of dispersion of dynamic analysis results for two homogeneous earth dams, 15 m and 30 m in height. From a set of 150 accelerogram records, 10 records were chosen for each method based on the highest spectral conformity for direct nonlinear time history analysis with provision for staged construction and fixed-base boundary conditions. Results showed that for the 15-meter dam, the spectral-matching method had the lowest range of displacement variation (3.66cm) and coefficient of variation (1.05). All coefficients of variation showed that for a 30-meter dam, the highest efficiency was for the methods of spectral intensity and mean spectral deviation, whose coefficients of variation were 1.73 and 1.79, respectively. Thus, it can be assumed that the period of the structure plays a major role in the efficiency of accelerogram selection methodologies.
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| Keywords: Homogeneous earth dam, dynamic analysis of dam, ground motion selection, response spectrum similarity metrics, dispersion of analysis results |
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Full-Text [PDF 450 kb]
(2 Downloads)
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Type of Study: Research |
Subject:
سد و سازه
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