Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 7 (July 2018) 1028-1037    Article in Press

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  EXPERIMENTAL STUDY ON USING UNIFORM TUNED LIQUID COLUMN DAMPER FOR STRUCTURAL CONTROL OF BUILDINGS RESTING ON LOOSE SOIL
 
A. Sarlak, H. Saeedmonir and C. Gheyratmand
 
( Received: December 08, 2017 – Accepted in Revised Form: March 09, 2018 )
 
 

Abstract    In this study, through series of shaking table tests and statistical analysis, the efficiency of Uniform Tuned Liquid Column Damper (UTLCD) in structures resting on loose soils, considering soil-structure interaction was investigated. The soil beneath the structure is loose sandy soil. The Laminar Shear Box (LSB) as a soil container was adopted and the scaled form of the prototype structure namely model structure using scaling laws was built. Applying selected earthquake record the top story displacement of the soil-structure model was obtained. In the rest of the tests, the soil-structure model was equipped with UTLCD and tested. 3 different in sizes of UTLCDs, each with different blocking ratio and frequencies was used. To implement tests, completely randomized factorial design, with factors of Blocking ratio, Frequency and Type of the UTLCD was adopted. Through statistical analysis of the experimental tests was demonstrated that the mentioned factors are effective in response of the structure. Using Response Surface Methodology (RSM), the optimum values of the factors to minimize the top story displacement has been found. In this study it was demonstrated that, due to low reduction in structural responses (in average 12 percent), the optimum UTLCD is not efficient enough in controlling structures resting on loose soils.

 

Keywords    Uniform Tuned Liquid Column Damper; Statistical Analysis; Soil-Structure Interaction; Shaking Table Tests; Laminar Shear Box

 

چکیده    در این پژوهش با استفاده از آزمایشات میز لرزه و بهره­ گیری از تحلیل آماری، کارایی میراگر مایعی تنظیم شونده با مقطع یکنواخت در سازه­هایی که بر روی خاک سست قرار دارند، با منظور کردن اثر اندر کنش خاک و سازه ،مورد بررسی قرار گرفته است. خاک بستر سازه خاک ماسه­ای شل می­باشد. از جعبه برشی لایه­ای به عنوان مخزن جهت نگه داری خاک استفاده شد. مدل مقیاس شده سازه واقعی بر اساس قوانین حاکم بر مقیاس بندی ساخته شد. از طریق آزمایش میز لرزه سازه مدل آزمایشگاهی تحت یک رکورد زلزله منتخب قرار گرفت و جابه­جایی نوک سازه اندازه­ گیری شد. در مابقی آزمایشات، سازه مدل آزمایشگاهی که مجهز به میراگر مد نظر بود، مجددا تحت همان بارگذاری قرار گرفت. از سه اندازه متفاوت از میراگر مدنظر که هریک قطر روزنه وفرکانس تنظیمی متفاوت دارند، استفاده شد. به منظور انجام آزمایشات یک طرح فاکتوریل کاملا تصادفی با فاکتورهای قطر روزنه، فرکانس و اندازه میراگراستفاده شد. نتایج تحلیل های آماری موید تاثیرگذاربودن این فاکتورها در پاسخ­های سازه می­باشند. از روش رویه­های پاسخ به منظور پیدا کردن مقادیر بهینه فاکتورهای تاثیرگذارکه منجر به کمینه شدن جابه­جایی نوک سازه می­شود استفاده شد. در این تحقیق نشان داده شد با توجه به اینکه میراگر مدنظربه میزان کمی (به طور متوسط 12 درصد) باعث کاهش پاسخ­های سازه می­گردد درنتیجه به عنوان یک ابزار کنترل کارا در سازه­هایی که روی خاک سست قرار دارند تلقی نمی­شود.

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