IJE TRANSACTIONS C: Aspects Vol. 28, No. 6 (June 2015) 864-870    Article in Press

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F. Nateghi. A. and M. Torbat. E
( Received: January 25, 2015 – Accepted: March 13, 2015 )

Abstract    In recent years, thin-walled accordion tubes under axial cyclic loading due to their appropriate energy absorption mechanism and behavioral characteristics were suggested as hysteretic metallic dampers. The effectiveness of accordion metallic damper (AMD) to protect and mitigate the response of structures under seismic loading is well established both experimentally and analytically. In this paper for the purpose of improvement, the effects of increasing the number of accordion tube layers on the damping behavior of AMD investigated experimentally and analytically. Experimental studies were conducted on single layer and two layer specimens under axial cyclic loading by dynamic universal actuator. Using the experimental results, analytical studies based on finite element method and inelastic dynamic analysis have been carried out on a series of single and multi-layer AMD models. The results obtained from studies conducted in this regard show that due to the more stable behavior and interaction effects, an increase in the number of layers has a great effect on the amount of dissipated energy, loading capacity and the other behavioral characteristics.


Keywords    Energy Absorption,Experimental Study,Finite Element Method,Multilayer Accordion Metallic Damper


چکیده    در این تحقیق با هدف بهبود رفتار میراگر فلزی آکاردئونی به عنوان یکی از بارزترین میراگرهای فلزی جاری شونده ، تأثیر افزایش تعداد لایه‌های جداره این میراگر مورد مطالعه تحلیلی و آزمایشگاهی و پارامتریک قرار گرفته است. مطالعات آزمایشگاهی بر روی نمونه‌های تک لایهو دو لایه انجام شده و مدل‌های تحلیلی تک لایه، دو لایه و سه لایه میراگر توسعه یافته و با استفاده از نتایج مطالعات آزمایشگاهی مورد صحت سنجی قرار گرفته است. همچنین تأثیر تغییر پارامترهای مهم هندسی جداره میراگر بر رفتار استهلاکی آن بررسی شده و مدل ایده آل هندسی ارائه گردیده است. نتایج نشان از تاثیر چشمگیر افزایش تعداد لایه های میراگر بر میزان جذب انرژی آن بعلت بوجود آمدن پایداری استهلاکی بیشتر برای میراگر دارد.



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