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تحلیل دینامیکی سدهای خاکی تحت زلزلههای مبتنی بر روش کاهش نویز | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 22، دوره 53، شماره 7، مهر 1400، صفحه 3101-3114 اصل مقاله (2.36 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.17687.6648 | ||
| نویسندگان | ||
| فاطمه نصیری1؛ حامد جاودانیان* 2؛ علی حیدری1 | ||
| 1گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه شهرکرد، شهرکرد، ایران | ||
| 2هیأت علمی گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه شهرکرد، شهرکرد، ایران | ||
| چکیده | ||
| در این مطالعه، با استفاده از روش عددی المان محدود به تحلیل دینامیکی سدهای خاکی با هسته رسی پرداخته شد. پاسخ لرزهای سدهای خاکی تحت رکوردهای زلزله اصلی و رکوردهای تجزیه شده مبتنی بر تئوری موجک بررسی شد. رکوردهای زلزله با استفاده از روش کاهش نویز و تا پنج سطح تجزیه شدند. نسبت طیف پاسخ شتاب به شتاب بیشینه، نسبت طیف پاسخ سرعت به سرعت بیشینه، نسبت طیف پاسخ جابهجایی به جابهجایی بیشینه، طیف دامنه فوریه و تاریخچه زمانی شدت آریاس تاج سدهای خاکی تحت رکوردهای زلزله اصلی و رکوردهای تجزیه شده مبتنی بر تئوری موجک محاسبه شد. نتایج نشان میدهد که نسبت طیفهای پاسخ شتاب تاج سد خاکی تحت رکوردهای تجزیه شده مبتنی بر روش کاهش نویز تا سطح سوم و نسبت طیفهای سرعت و جابهجایی تاج سد تا سطح چهارم، در مقایسه با رکوردهای اصلی زلزله از دقت قابل قبولی برخوردار هستند. اختلاف حداکثر مقدار نسبت طیف شتاب، نسبت طیف سرعت و نسبت طیف جابهجایی تحت رکورد حاصل از سطح سوم تجزیه و رکورد اصلی برای زلزلههای مورد استفاده به ترتیب برابر با 21/51، 4/19 و 8/62 درصد می باشد. نتایج تحلیلهای دینامیکی نشان میدهد که طیف دامنه فوریه و شدت آریاس تاج سد خاکی تحت رکوردهای تجزیه شده مبتنی بر روش کاهش نویز تا سطح چهارم از سازگاری خوبی با رکوردهای اصلی برخوردار میباشند. نتایج حاکی از آن است که در تحلیل دینامیکی سدهای خاکی میتوان رکوردهای تجزیه شده مبتنی بر تئوری موجک را جایگزین رکوردهای زلزله اصلی نمود. | ||
| کلیدواژهها | ||
| سد خاکی؛ تحلیل دینامیکی؛ تئوری موجک؛ کاهش نویز؛ مدلسازی عددی | ||
| موضوعات | ||
| ژئو تکنیک لرزه ای؛ سازه های هیدرولیکی؛ سدهای خاکی | ||
| عنوان مقاله [English] | ||
| Dynamic Analysis of Earth Dams under De-Noised Earthquake Records | ||
| نویسندگان [English] | ||
| Fatemeh Nasiri1؛ Hamed Javdanian2؛ Ali Heidari1 | ||
| 1Department of Civil Engineering, Shahrekord University, Shahrekord, Iran. | ||
| 2Assistant Professor, Department of Civil Engineering, Shahrekord University, Shahrekord, Iran. | ||
| چکیده [English] | ||
| In this study, the dynamic behavior of earth dams with clay core was analyzed using the finite element method. The seismic responses of earth dams under main and wavelet-based decomposed earthquake records were investigated. Earthquake records were decomposed up to five stages by using the wavelet de-noising method. The ratio of acceleration response spectrum to maximum acceleration, ratio of velocity response spectrum to maximum velocity, ratio of displacement response spectrum to maximum displacement, Fourier amplitude spectrum and time history of Arias intensity of earth dam crest under main and wavelet-based decomposed earthquake records were analyzed. The results demonstrated that the acceleration response spectrum ratio of dam crest under de-noised records up to 3rd level and the velocity and displacement spectrum ratios of dam crest up to 4th level has an acceptable accuracy in comparison to the responses under main earthquake records. Results of the dynamic analysis indicated that Fourier amplitude spectra and Arias intensity of earth dam crest under de-noising based records up to 4th level are compatible with main earthquake records. The results also showed that the wavelet-based decomposed earthquake records can be a reliable alternative for main earthquake records in the dynamic analysis of earth dams. | ||
| کلیدواژهها [English] | ||
| Earth dam, Dynamic analysis, Wavelet theory, De-noising method, Numerical modeling | ||
| مراجع | ||
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