ارزیابی همبستگی ریاضی بین پارامترهای شدت-انرژی زلزله و پاسخ های دینامیکی سد خاکی- مطالعه موردی: سد جامیشان

نوع مقاله : مقاله پژوهشی

نویسنده

گروه مهندسی عمران، دانشکده مهندسی، دانشگاه صنعتی کرمانشاه، کرمانشاه، ایران

چکیده

تا به حال رفتار لرزه ای سدهای خاکی در قالب تحلیل های زمانی و فرکانسی مورد مطالعه قرار گرفته است. در کنار این دو چارچوب، موضوعات انرژی و شدت موج لرزه ای نیز مفاهیمی بسیار تاثیرگذار هستند، که می توان رفتار لرزه ای سدهای خاکی را بر مبنای آنها نیز ارزیابی کرد. در این پژوهش، اثرات تغییرات چگالی انرژی ویژه و سنجه های شدت زلزله های ورودی همانند شدت های آریاس، مشخصه و هازنر بر مقادیر پاسخ های لرزه ای سد خاکی-سنگریزه ای جامیشان مطالعه شده است. از این رو، مدل سازی المان محدود دو بعدی سد در چارچوب منطق کرنش مسطح و روش تحلیل دینامیکی غیر-خطی تاریخچه زمانی اجرا شده است. جهت تقلیل و حذف اثرات ناخوشایند بازگشت امواج لرزه ای در مرزهای انتهایی دیواره مدل های دینامیکی، مفهوم المان نامحدود با تعریف نقطه قطب بکار برده شده است. تعداد 9 رکورد مختلف مولفه های افقی طولی و عرضی زلزله های نزدیک-گسل با دامنه های شتاب مقیاس شده و نشده، با میزان انرژی و شدت های لرزه ای متفاوت به مدل سد اعمال شده است. مقادیر بزرگنمایی پاسخ های لرزه ای تاج سد نسبت به حرکات ورودی در بستر سنگی، در طی اعمال حرکات لرزه ای مختلف بررسی شده است. بر اساس یافته های این مطالعه، مابین پاسخ های لرزه ای تاج سد و پارامترهای انرژی و شدت حرکات لرزه ای ورودی، رابطه ای صعودی و نمایی با دقت برازش مناسب وجود دارد.   

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Mathematical correlation evaluation between earthquake intensity-energy parameters and dynamic responses of earth dam - case study: Jamishan dam

نویسنده [English]

  • Yazdan Shams Maleki
Kermanshah University of Technology
چکیده [English]

Until now, the seismic behavior of earth dams has been studied in the form of time and frequency analyses. In addition to these two frameworks, the issues of energy and seismic wave intensity are very influential concepts that can be used to evaluate the seismic behavior of earth dams based on them. In this research, the effects of changes in specific energy density and intensity measures of incoming earthquake waves, such as Arias, Characteristic, and Housner intensities, on the values of the seismic responses of the Jamishan earth-rockfill dam have been studied. Therefore, the 2D finite element modeling of the dam has been implemented in the framework of plane-strain logic and the time-history nonlinear dynamic analysis method (NLDAM). In order to reduce and eliminate the unpleasant effects of the return of seismic waves in the lateral end boundaries of the dynamic models, the concept of the infinite element with the definition of the pole point has been used. The number of 9 different records of near-fault earthquakes with scaled and un-scaled acceleration amplitudes with different energy contents and seismic intensities have been applied to the dam model. Amplification values of the seismic responses of the dam’s crest compared to the incoming seismic motions in the bed rock have been investigated during the application of different seismic motions. Based on the findings of this study, there is an exponential relationship between the seismic responses of the dam’s crest and the energy and intensity parameters of the input seismic motions.

کلیدواژه‌ها [English]

  • Earth Dam
  • Energy Density
  • Earthquake Intensity Parameters
  • Seismic Analysis
  • Finite Element Analysis
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