تحلیل حساسیت اتلاف انرژی در میراگر تسلیم شونده با میله‌ های کنسولی

نوع مقاله : یادداشت فنی

نویسندگان

1 دانشکده‌ی مهندسی عمران، دانشگاه خواجه ‌نصیرالدین طوسی، تهران، ایران.

2 دانشکده مهندسی عمران، دانشگاه خواجه نصیر الدین طوسی، تهران، ایران

چکیده

کنترل مقدار جابجایی و ضرورت اتلاف انرژی مناسب در سازه‌های جداسازی‌شده، که تحت اثر باد و زلزله هستند، نمایانگر اهمیت استفاده از تجهیزاتی، نظیر میراگرهای تسلیم‌شونده در کنار جداساز لرزه‌ای است. میراگرهای تسلیم‌شونده‌ی میله‌ای با میله‌های کنسولی، با توجه ‌به نحوه‌ی قرارگیری میله‌ها، توانایی اتلاف انرژی در جهات مختلف را دارند و برای استفاده در کنار جداسازهای لرزه‌ای مؤثر هستند. رفتار میراگرهای مذکور متأثر از مؤلفه‌هایی، نظیر: قطر میله، طول میله، تعداد میله، و تنش تسلیم (مصالح) میله است. در پژوهش حاضر، پس از مدل‌سازی یک میراگر میله‌ای با میله‌ی کنسولی در نرم‌افزار اجزاء محدود آباکوس، اثر ایجاد تغییر در هر یک از مؤلفه‌های اخیر در میزان اتلاف انرژی میراگر بررسی شده است. نتایج پژوهش حاضر نشان داده‌اند که اتلاف انرژی در میراگر میله‌ای کنسولی، بیشترین حساسیت را به ترتیب نسبت به مؤلفه‌های قطر میله، تعداد میله، طول میله، و تنش تسلیم میله دارد. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Sensitivity Analysis of Energy Dissipation in a Yielding Damper with Cantilever Bars

نویسندگان [English]

  • Saeed Reza Sabbagh Yazdi 1
  • Mostafa Rezvani Sharif 2
  • Reza Zakibakhsh Mohammadi 1
1 Faculty of Civil Engineering of K. N. Toosi University of Technology, Tehran, Iran.
2 Civil Engineering Department, K. N. Toosi University of Technology, Tehran, Iran
چکیده [English]

Seismic isolators serve a vital function in mitigating structural damage resulting from lateral loads and in diminishing the forces exerted upon the structure. In structures that are isolated, the displacement may experience a substantial increase, which, in the case of bridges, could potentially result in the collapse of the deck from its supports. In addition, isolator systems may have low energy absorption capacity. Controlling displacement and ensuring adequate energy dissipation in isolated structures under wind and earthquake loads proves the importance of incorporating devices like energy dampers alongside seismic isolators. Yielding dampers are a category of dampers recommended in previous research, which are produced in various types. These dampers utilize the inelastic deformation of ductile metals to dissipate the energy. One effective type of damper for energy dissipation in isolated structures is the bar-shaped damper with cantilever bars. In these dampers, the bars are positioned vertically, so that energy is dissipated regardless of the direction. The energy-absorbing elements in these dampers are the cantilever bars, with one end connected to the substructure and the other to the isolated structure. As relative displacement occurs between the substructure and isolated structure, the bars undergo bending and enter the plastic deformation range, so that dissipating earthquake energy occurs. The behavior of these dampers is influenced by parameters such as bar diameter, bar length, number of bars, and bar yield stress. Hence, determining the effect of each parameter on damper performance is crucial for selecting a suitable damper. In this study, after modeling a bar damper with a cantilever bar in the ABAQUS finite element software, the effect of changes in each of these parameters on the damper's energy dissipation was analyzed. The results demonstrate that energy dissipation in this damper is most sensitive to changes in bar diameter, followed by the number of bars, bar length, and bar yield stress. 

کلیدواژه‌ها [English]

  • Energy dissipation
  • yielding damper
  • cantilever bar damper
  • isolated structure

مراجع

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