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

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