تحلیل دینامیکی سدهای خاکی تحت زلزله‌های مبتنی بر روش کاهش نویز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه شهرکرد، شهرکرد، ایران

2 هیأت 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

موضوعات


عنوان مقاله [English]

Dynamic Analysis of Earth Dams under De-Noised Earthquake Records

نویسندگان [English]

  • Fatemeh Nasiri 1
  • Hamed Javdanian 2
  • Ali Heidari 1
1 Department of Civil Engineering, Shahrekord University, Shahrekord, Iran.
2 Assistant 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
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