بررسی اثرات فاصله هسته از بتن محصور کننده بر رفتار مهاربندهای کمانش ناپذیر

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشیار، دانشگاه سمنان، سمنان، ایران

2 کارشناس ارشد مهندسی سازه، دانشگاه سمنان، سمنان، ایران

3 استادیار، دانشگاه سمنان، سمنان، ایران

چکیده

با توجه به معایب رفتار لرزه ای مهاربندهای معمولی به لحاظ شکل پذیری اندک و منحنی هیسترزیس نامتقارن در کشش و فشار و وجود پینچینگ و در نتیجه کاهش میزان استهلاک انرژی، مهاربندهای کمانش ناپذیر به عنوان نسل جدید سیستم مهاربندی پیشنهاد شده اند. در این مقاله به بررسی نوع خاص از اینگونه مهاربندها با هسته فولادی و غلاف بتنی پرداخته شده و اثرات فاصله هسته از بتن محصور کننده این مهاربندها در قالب تحلیل اجزای محدود مورد بررسی قرار گرفته است. نتایج نشان می دهد که مود کمانش و جذب انرژی این سیستم بسیار وابسته به مقدار این فاصله بوده و فاصله 2 تا 4 میلی متر باعث استهلاک بیشترین انرژی می گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigate effects of the core distance from confining concrete on behavior of buckling restrained braces

نویسندگان [English]

  • Madjid Gholhaki 1
  • Amin Jamali Far 2
  • Omid Rezaei Far 3
1 Associate Professor, Department of Civil Engineering, University of Semnan, Semnan, Iran
2 MSc of Structural Engineering, Department of Civil Engineering, University of Semnan, Semnan, Iran
3 Assistant Professor, Civil Engineering Department, University of Semnan, Semnan, Iran
چکیده [English]

Due to disadvantages of seismic behavior in conventional braces in term of low plasticity and asymmetric hysteresis curve in tension and compression and pinching which reduces the energy dissipation rate, Buckling Restrained Braces (BRBs) have been proposed as a new generation of bracing system. This paper examines specific type of these braces with steel core and concrete sheath. The effects of core distancefrom confining concrete of these braces haven been discussed using Finite element analysis method. The results show that buckling mode and energy absorption of this system have largely depend on the distance, and 2 to 4 mm distance causes the most energy dissipation.

کلیدواژه‌ها [English]

  • Buckling Restrained Brace (BRB)
  • core distance from concrete
  • hysteresis curve
  • Energy dissipation
[1] Dolce M. Cardone D. and Marnetto R. (2000) Implementation and testing of passive control devices based on shape memory alloys. Earthquake Engineering and Structural Dynamics, 29, 945-68.
[2] Kumar G.R. Kumar S.R. and Kalyanaraman V. (2007) Behavior of frames with Non-Buckling bracings under earthquake loading. Journal of constructional steel research, 63, 254-262.
[3] Analysis Users Manual, "Volume1:Introduction, Spatial  Modeling Execution & Out put",Simulia.
[4] Black, C. J., Markis, N., and Aiken, I., (2002), "Component testing, stability analysis and
characterization of Buckling-Restrained Unbonded Braces ", Technical Rep. No. PEER Report
2002/8, Pacific Earthquake Engineering Research Center, Univ. of California at Berkeley,
Berkeley, Calif.
[5] Markis, N., (2002), "Plastic torsional buckling of a cruciform column ", J. Engrg. Mech. ASCE.
Inreview.
[6] Lopez, W. A., Gwie, D. S., Saunders, C. M., Lauck, T.W., (2002), "Lessons learned from largescale
tests of unbonded braced frame subassemblages ", Proceedings 71st Annual Convention,
Structural Engineers Association of California, Sacramento, California.
[7] Fahnestock, L. A., Sause, R., and Ricles, J. M., (2006), "Seismic response and performance of
buckling-restrained braced frames ", Journal of Structural Engineering, ASCE, September 2007,
pp. 1195-1204.
[8] N. Hoveidae and B. Rafezy (2012), "Overall buckling behavior of all-steel buckling restrained braces," Journal of Constructional Steel Research, no. 79, pp. 151-158.
[9] T. Takeuchi, J. F. Hajjar, R. Matsui, K. Nishimoto and I. D. Aiken (2012), "Effect of local buckling core plate restraint in buckling restrained braces," Engineering Structures, no. 44, pp. 304-311.
[10] Ahmad Mostafa.Abdulwahab (2013),"Nonliner Finite Element Modeling of The Load-Carrying and Energy Dissipationc Apacitice for Buckling-Restrained Brace", Sharjah, United Arab Emirates.
[11] A. Korzekwa & R. Tremblay (2009),"Numerical simulation of the cyclic inelastic behaviour of buckling
restrained braces",Taylor & Francis Group, London, ISBN 978-0-415-56326-0.
[12] Chou, C., Chen, S (2010). Subassemblage tests and finite element analyses of sandwiched buckling restrained braces, Engineering Structures, 32:8, 2108-2121.
[13] Tremblay, R., Bolduc, P., Neville, R., and DeVall(2006), R.Seismic testing and performance of buckling restrained bracing systems. Can. J. Civ. Eng. 33(1): 183-198.