IJE TRANSACTIONS C: Aspects Vol. 28, No. 12 (December 2015) 1702-1710   

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A. Bahaarmast and J. Razaaghi
( Received: October 03, 2015 – Accepted: December 24, 2015 )

Abstract    The column-tree constructional schemes allows for a reliable and convenient erection of moment resisting steel frames. Strengthening of column-tree connection with a haunch part can significantly improve seismic behavior of whole system. In the current study behavior of column-tree connections with haunched beams and end plate splices have been investigated. Special attention was paid for evaluation of the effect of haunch section length and presence of the beams bottom flange. Nonlinear finite element analysis has been used for numerical analyses. The results indicate an improvement of the load bearing capacity of specimens when a longer haunch was used and also when beam bottom flange existed in the haunch part. A direct relation between haunch length and the amount of stress in splice plates was also observed. However all connections showed ductile behavior during cyclic analysis, specimens with longer haunch revealed more desirable behavior. It was concluded that despite some deficiencies observed during the numerical tests, in presence of a longer haunch and also the beam\'s bottom flange, a noticeable improvement of the general behavior of connection can be achieved.


Keywords    Column-Tree Connection, Haunch, Splice Plate, Finite Element Analysis, Ductile Behavior


چکیده    مطالعه ی حاضر رفتار اتصال ستون- درختی تقویت شده با ما هیچه را تحقیق می کند. هدف اصلی مطالعه دریافت میزان تأثیر طول ماهیچه و نیز وجود یا عدم وجود بال پایین تیر در رفتار اتصال می باشد. اتصال ستون- درختی یکی از طرح های اجرایی سازه ای است که به دلیل محاسنش اخیراً بیشتر مورد استفاده قرار می گیرد. تقویت اتصال ستون- درختی با ماهیچه سبب بهبود رفتار اتصال شده و احتمال رفتار شکل پذیر مورد نظر را در آن افزایش می دهد. در این تحقیق جهت دست یابی به نتایج از تحلیل اجزای محدود غیر خطی استفاده شده است. نتایج تحقیق نشان می دهد که در صورت استفاده از ماهیچه های بلندتر و حضور بال پایین تیر ظرفیت باربری نمونه ها بهبود می یابد. رابطه ی مستقیم بین طول ماهیچه و میزان تنش های ورق های اتصال نشان داده شد. اگرچه توانایی رفتار شکل پذیر تمامی نمونه ها با ارزیابی رفتار چرخه ای آن ها مشاهده شد، نمونه های دارای ماهیچه ی بلندتر رفتلر بهبودیافته تری از خود نشان دادند. با وجود برخی نتایج نا مناسب، این نتیجه گرفته شد که استفاده از ماهیچه های بلند تر و وجود بال پایین تیر درحالت کلی باعث بهبود رفتار نمونه می گردند.


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