IJE TRANSACTIONS A: Basics Vol. 26, No. 10 (October 2013) 1119-1134   

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F. Shahidi, F. Nateghi-Alahi and F. Shahidi
( Received: January 22, 2013 – Accepted in Revised Form: May 16, 2013 )

Abstract    After Northridge (1994) and Kobe (1995) earthquakes, several studies have been conducted to improve the seismic performance of steel structures. In this investigation, new steel moment-resisting connections (FSFN) developed by the authors, were studied by the non-linear numerical analysis. These connections were single-sided beam-to-column assemblies that are representative of exterior beam-to-column connections. Seismic performance of FSFN connections in comparison to the W-series of existing KBB connections under standard and near fault load history based on AISC 341 and FEMA 355D were also studied. For this purpose, 32 analytical modeled specimens were evaluated and the results were compared. Results showed that FSFN bracket connection has a seismic performance similar to KBB connection and it is an appropriate connection for the special moment resisting frames both in far and near fault zones. More so, these connections do not have patent and due to their dimensions which are smaller than the Kaiser brackets, they can supported deeper beams up to 100 cm. Therefore, it can be considered as an appropriate alternative for the Kaiser patented connections. This paper is to present the analytical modeling, non-linear behavior and the results of the comparison studies in detail including obtained conclusions.


Keywords    FSFN brackets, Non-linear numerical analysis, Standard load history, Near-Fault load history, and KBB brackets.


چکیده    [if gte mso 9]>

پس از زلزله 1994 نورثریج و 1995 کوبه ژاپن، مطالعات زیادی در خصوص بهبود عملکرد لرزه ای سازه ها صورت گرفت. در این بررسی رفتار اتصال گیردار جدید FSFN توسعه یافته توسط نویسنده های این مقاله، با استفاده از روش اجزاء محدود غیر خطی مورد ارزیابی قرار گرفت. این اتصال به صورت یک طرفه و به عنوان یک تیر خارجی بررسی گردید. همچنین ارزیابی عملکرد لرزه ای اتصال FSFN در مقایسه با اتصال کایزر و تحت بارگذاری چرخه ای استاندارد و نزدیک گسل بر اساس آیین نامه های AISC 341 و FEMA 355D انجام شد. بدین منظور 32 نمونه عددی مورد ارزیابی قرار گرفت، نتایج نشان داد که اتصال براکت FSFN رفتار لرزه ای مشابه با اتصال کایزر دارد و آن اتصالی مناسب برای قاب خمشی ویژه در هردو منطقه دور و نزدیک گسل می باشد. این براکت در تیرهای عمیق دارای ابعادی کوچکتر نسبت براکت کایزر می باشد و قادر به پشتیبانی از تیرهای عمیق تری تا عمق مقطع cm­100، نسبت به اتصال کایزر می باشد. بنابراین آن می تواند اتصالی مناسب و جایگزین اتصال انحصاری کایزر باشد. این مقاله به ارائه مدل تحلیلی، رفتار غیر خطی و مطالعه مقایسه ای، در جزئیات نتایج بدست آمده می پردازد



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