IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1654-1663   

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A. Sarlak, H. Saeedmonir and C. Gheyretmand
( Received: July 10, 2017 – Accepted in Revised Form: September 08, 2017 )

Abstract    In the present work, the effect of Soil-Structure Interaction (SSI) in low frequency structures resting on loose soil, through numerical modelling and shaking table tests have been studied. In theoretical studies two types of models namely fixed base and flexible base structure were subjected to three selected earthquake records. Nonlinear dynamic analysis was employed for all of the numerical models. Geometrical and material nonlinearities were considered in all models and finite element method was used for soil modelling. To verify the outputs of the numerical modelling, shaking table tests were carried out. For experimental tests, scaled form of the main structure according to scaling laws, and laminar shear box as a container of the soil, was built. By comparison between the numerical modelling and the shaking table tests results, good agreement was observed. Therefore, the numerical modelling approach was validated. In next step by implementing this approach, comparison between the fixed base and the flexible base results was carried out. In this study, it was demonstrated that considering the SSI effects on structures resting on loose soils increases the lower story drifts. Besides if the structure is located in sites which is susceptible to experience strong earthquakes, this increase is dominant. Therefore negelecting SSI effects leads to unsafe design of the structure.


Keywords    Soil-Structure Interaction, Fully nonlinear analysis, Shaking table tests, Laminar Shear Box


چکیده    دراین پژوهش اثر اندرکنش خاک وسازه برای سازه­هایی با فرکانس ارتعاشی پایین، که برروی خاک سست قرار دارند، به صورت تئوریک و آزمایشگاهی مورد بررسی قرار گرفته است. مدل‌‌های عددی شامل دو دسته می‌‌باشند: سازه با بستر صلب و سازه با بسترانعطاف پذیر، که همگی تحت سه رکورد زلزله منتخب قرار گرفتند. تحلیل دینامکی غیر خطی برروی تمامی مدل‌‌های عددی صورت پذیرفت. در تمامی مدل­ها رفتار غیر خطی هندسی و رفتار غیرخطی مواد منظور شد. به منظور مدلسازی خاک از روش اجزا محدود استفاده گردید. به منظور راستی آزمایی نتایج مدلسازی عددی، آزمایشات میز لرزه انجام شد. سازه مدل آزمایشگاهی، بر اساس قوانین حاکم بر مقیاس بندی ساخته شد. جعبه برشی لایه‌‌ای برای منظورکردن خاک در مدلهای آزمایشگاهی میز لرزه، ساخته شد. مقایسه نتایج مدلسازی‌‌های عددی و تست‌‌های آزمایشگاهی موید انطباق قابل قبول آنها می‌‌باشد. در نتیجه روش مدلسازی عددی به کاررفته معتبر شناخته شد. در مرحله بعد با بهره­گیری از این روش جهت مدلسازی عددی، مقایسه بین مدل‌‌های تئوریک دو دسته سازه (سازه­های با بستر صلب و سازه‌‌های با بستر انعطاف پذیر) صورت پذیرفت. در این تحقیق نشان داده شد که در نتیجه منظور کردن اثر اندرکنش خاک و سازه برای سازه­هایی که روی خاک سست قرار دارند، دریفت طبقات تحتانی افزابش می­یابد. این افزایش در مورد سازه­هایی که علاوه بر سست بودن خاک بستر، مستعد تجربه زلزله­های شدید نیز می­باشند، به اندازه­ای است که نادیده گرفتن اثر اندرکنش خاک و سازه منجر به طراحی غیر­ایمن سازه می­گردد.


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