IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1498-1507    Article in Press

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

Abstract    In the present work, the effect of Soil-Structure Interaction (SSI) in structures resting on a soft 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. Fully Nonlinear method was employed for analyzing all of the numerical models and Finite Element Method (FEM) was used for modelling soil beneath the structure. In order to verify the outputs of the numerical modelling, shaking table tests were carried out. In experimental tests, scaled form of the main structure, according to scaling laws was built. Laminar Shear Box (LSB) as a container, was built to implement soil in the soil-structure model on the shaking table. By comparison between the numerical modelling and the shaking table tests results, a good agreement was observed. Therefore, the results of the comparison between the fixed base and the flexible base, in the numerical modelling are reliable. In this study, was demonstrated that if the structure rested on the soft soil, is located in a site which is susceptible to experience strong earthquakes, the necessity of considering SSI effects is avoidable.


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


چکیده    دراین پژوهش به صورت تئوریک و آزمایشگاهی اثر اندرکنش خاک وسازه برای سازهایی که برروی خاک سست قرار دارند، 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 گرفته‌‌اند. تحلیل دینامکی غیر خطی برروی تمامی مدل‌‌های عددی صورت پذیرفت و به منظور مدلسازی خاک از روش اجزا محدود استفاده گردید. به منظور راستی آزمایی نتایج مدلسازی عددی، آزمایشات میز لرزه انجام شد. در آزمایشات صورت گرفته، سازه مقیاس شده، 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 کامل آنها می‌‌باشد. از این رو نتایج بدست آمده درشبیه‌‌سازی‌‌های عددی که از مقایسه مدل‌‌های تئوریک دو دسته سازه های با بستر صلب و سازه‌‌ها با بستر انعطاف پذیر عاید شده‌‌اند نتایجی قابل اطمینان تلقی می‌‌شود. در این تحقیق نشان داده شد که ضرورت منظور کردن اثر اندرکنش خاک و سازه برای سازه‌‌هایی که برروی خاک شل قرار دارند و در مکان‌‌هایی واقع شدند که مستعد تجربه زلزله های شدید هستند، اجتناب ناپذیر است.

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