مقایسه‌ی رفتار دینامیکی دره‌های منشوری و غیرمنشوری با استفاده از روش المان مرزی سه بعدی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، - دانشکده مهندسی عمران ،دانشگاه تبریز، ایران

2 دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه تبریز، - ایران

چکیده

تجربه زلزله­های متعدد در دنیا نشان می­دهد برای یک زمین لرزه مشخص، میزان آسیب سازه­های با مشخصه­های تقریبا همسان به شدت متاثر از وضعیت ساختگاه است، که ازآن به عنوان اثرات ساختگاهی یاد می شود. در اکثر تحلیلهای مربوط به تفرق امواج لرزه ای که برای بررسی اثرات ساختگاهی انجام شده،  دره­ها معمولا به شکل دلخواه و منشوری فرض می شوند. آنچه در واقعیت وجود دارد در اغلب موارد غیر منشوری بودن دره­ها در راستای محور طولی دره است به طوریکه معمولا محلهای تنگ شدگی دره­ها به عنوان ساختگاههای مناسب انواع سازه­ها انتخاب شده و مورد مطالعه قرار می گیرند. در این تحقیق رفتار دینامیکی دره­های  منشوری و غیرمنشوری با استفاده از روش المان مرزی سه بعدی در شکلهای مثلثی، ذوزنقه و نیم دایره تحت امواج   SHبررسی شده است. نتایج نشان می دهند که جابجایی دره­های غیر منشوری که دارای تنگ شدگی در میانه و بازشدگی در دو انتهای دره می باشند، با توجه به فرکانس و زاویه برخورد موج  در بعضی نقاط، بیشتر از دره های منشوری می باشد. بنابراین لازم است، برای به دست آوردن مقادیر دقیق اثرات ساختگاهی مدلسازی سه بعدی که واقعی تر باشد از دره­ها انجام شود.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of Dynamic Behavior Prismatic and non- Prismatic Canyons using Three- Dimensional Boundary Element Method

نویسندگان [English]

  • Reza Tarinejad 1
  • Mohsen Isari 2
1 Assistant Professor, Department of Civil Engineering, University of Tabriz, Tabriz, Iran
2 MSc Student, Department of Civil Engineering, University of Tabriz, Tabriz, Iran
چکیده [English]

Experiencing several earthquakes around the world  indicate that, for a specific earthquake, the amount of structural damages, with almost identical features, is highly influenced by the condition of the site, which is called as the site effects. In fact, something which exists in reality and practice is, in most cases, the non-prismatic canyons in line with the longitudinal axis of the valley so that narrowing parts of the canyons are usually selected as the appropriate sites for a variety of structures, and then studied. In this study, the dynamic behavior of prismatic and non-prismatic canyons, using  three-dimensional boundary element method in triangular, trapezoidal, and semi-circular forms under the SH waves, are studied.The Results indicate that the movement of non-prismatic canyons, which have narrowing in the middle and  opening in two ends of the canyon, based on the frequency and wave angle, are in some cases more than  prismatic canyon. Therefore, to obtain accurate values of site effects, it is necessary to do a realistic and  three-dimensional modeling of the canyon.

کلیدواژه‌ها [English]

  • Non-Prismatic Canyons
  • Boundary element method
  • Site Effects
  • Prismatic Canyons

مراجع

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