Abstract    The possibility of employing internal wall as mass absorber in rectangular water storage tanks subjected to harmonic ground motion excitation is investigated in this paper. Internal walls are used in these tanks usually for service performance purposes, which could be used as mass absorber to control seismic demand on tank's exterior walls. Derivation of the response of the coupled system including rigid external walls, flexible internal wall and fluid field is in frequency domain. The responses of the tank are evaluated subjected to harmonic excitations. By tuning the dynamic behavior of the tank and the sloshing liquid by changing the mass and stiffness of internal flexible wall, it is shown that wave elevation and water pressure on external rigid walls can be significantly reduced.

Keywords    Seismic demand; Mass absorber; Fluid-structure interaction; water storage tanks.

چکیده    در اين مقاله امکان بکارگيري جاذب جرم براي کنترل پاسخ ديناميکي آب در مخازن ذخيره‌‌ي آب مستطيلي شکل مورد بررسي قرار مي‌گيرد. اين مخازن اغلب بدليل نيازهای مربوط به کاربری دارای ديواره داخلی ميباشند که ميتوان از اين ديوار انعطاف پذير بعنوان جاذب‌جرم برای کنترل رفتار مخزن استفاده نمود. پاسخ سيستم در بر گيرنده اندرکنش ديواره‌هاي صلب خارجي، ديواره‌ي انعطاف‌پذير داخلي و سيال در حوزه‌ي فرکانس استخراج شده و پاسخ مخزن به تحريکات هارمونيکي مختلف مورد ارزيابي قرار گرفته است. نتايج نشانگر آنستکه با تنظيم جرم و سختي ديواره‌ي انعطاف‌پذير داخلي در يک فرکانس مشخص ميتوان پارامترهای پاسخ سيستم شامل ارتفاع موج آب و فشار آب بر روي ديواره‌ي صلب خارجي را برای محدوده فرکانسی که تحريکات زلزله دارای محتوای فرکانسی عمده در آن هستند بنحو محسوسی کاهش داد.

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