Abstract




 
   

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

PDF URL: http://www.ije.ir/Vol28/No12/C/2-2152.pdf  
downloaded Downloaded: 262   viewed Viewed: 2660

  EVALUATION OF COLUMN-TREE MOMENT RESISTING CONNECTION WITH END PLATES AND HAUNCHED BEAM (RESEARCH NOTE)
 
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.

References   

1.     Miller, D.K., "Lessons learned from the northridge earthquake", Engineering Structures,  Vol. 20, No. 4–6, (1998), 249-260.

2.     Mahin, S.A., "Lessons from damage to steel buildings during the northridge earthquake", Engineering Structures,  Vol. 20, No. No. 4–6, (1998), 261-270

3.     F., S., Nateghi- A F., S., R.M. and F., S., "Influential factor in improving the seismic performance of the kaiser bolted bracket moment connection", International Journal of Engineering Vol. 26, (2013), 163-176.

4.     F., S., F., N.-A. and F., S., "Non-linear behavior of new (fsfn) moment resisting connections in comparison to the existing kbb connections in steel frames",International Journal of Engineering,  Vol. 26, (2013), 1119-1134.

5.     SAC, "State of the art reporton connection performance", in FEMA 355d, SAC Joint Venture, Sacramento, California., (2000).

6.     Uang, C.-M. and Bondad, D.M., "Static cyclic testing of pre-northridge and haunch repaired steel moment connections, Division of Structural Engineering, University of California, San Diego,  Vol. 96,  (1996).

7.     Uang, C.-M., Bondad, D. and Lee, C.-H., "Cyclic performance of haunch repaired steel moment connections: Experimental testing and analytical modeling", Engineering Structures,  Vol. 20, No. 4, (1998), 552-561.

8.     Uang, C.-M., Yu, Q.-S.K., Noel, S. and Gross, J., "Cyclic testing of steel moment connections rehabilitated with rbs or welded haunch", Journal of Structural Engineering,  Vol. 126, No. 1, (2000), 57-68.

9.     Chen, C.-C., Lin, C.-C. and Lin, C.-H., "Ductile moment connections used in steel column-tree moment-resisting frames", Journal of Constructional Steel Research,  Vol. 62, No. 8, (2006), 793-801.

10.   Astaneh-Asl, A. and Council, S.S.E., "Seismic design of steel column-tree moment-resisting frames, Structural Steel Educational Council,  (1997).

11.   Nakashima, M., Inoue, K. and Tada, M., "Classification of damage to steel buildings observed in the 1995 hyogoken-nanbu earthquake", Engineering Structures,  Vol. 20, No. 4, (1998), 271-281.

12.   Chen, C.-C. and Lin, C.-C., "Seismic performance of steel beam-to-column moment connections with tapered beam flanges", Engineering Structures,  Vol. 48, (2013), 588-601.

13.   Lee, K., Li, R., Chen, L., Oh, K. and Kim, K.-S., "Cyclic testing of steel column-tree moment connections with various beam splice lengths", Steel and Composite Structures,  Vol. 16, No. 2, (2014), 221-231.

14.   Abaqus, F., "Abaqus analysis user’s manual", Dassault Systemes, Vélizy-Villacoublay, France,  (2009).

15.   Construction, A.I.o.S., "Seismic provisions for structural steel buildings, American Institute of Steel Construction,  (2002).

16.   Lu, L.-W., Ricles, J.M., Mao, C. and Fisher, J.W., "Critical issues in achieving ductile behaviour of welded moment connections", Journal of Constructional Steel Research,  Vol. 55, No. 1, (2000), 325-341.

17.   El-Tawil, S., Mikesell, T. and Kunnath, S.K., "Effect of local details and yield ratio on behavior of fr steel connections", Journal of Structural Engineering,  Vol. 126, No. 1, (2000), 79-87.

18.   R., A.G., S., Y.G. and Hoseinali Beigy M, "Analytical andeam-to-cft column connection under monotonic loading", International Journal of Engineering,  Vol. 27, (2014), 293-306.


Download PDF 



International Journal of Engineering
E-mail: office@ije.ir
Web Site: http://www.ije.ir