ارزیابی اثر ضربه سازه‌های مجاور بر ساختمان مجهز به جداساز لرزه‌ای اصطکاکی قوسی با فواصل لرزه‌ای طبق نشریه 360 تحت حرکت نزدیک گسل

نوع مقاله : مقاله پژوهشی

نویسندگان

مرکز مطالعات مخاطرات طبیعی، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

هدف این مقاله، بررسی اثر ضربه ساختمان مجاور بر پاسخ‌های ساختمان جداسازی شده لرزه‌ای با جداسازهای آونگی‌اصطکاکی دو و سه‌قوسی با در نظر گرفتن فواصل لرزه‌ای دستورالعمل بهسازی لرزه‌ای ساختمان‌های موجود (نشریه شماره 360) است. بررسی کفایت فواصل لرزه‌ای محاسبه ‌شده طبق نشریه 360 برای ساختمان‌های جداسازی شده با جداسازهای اصطکاکی قوسی در پژوهش‌های پیشین انجام نشده است. برای رسیدن به این هدف، ابتدا مدل سه‌بعدی ساختمان‌های جداسازی شده در دو حالت با برخورد به سازه مجاور و بدون برخورد ایجاد شد. برای هریک از مدل‌های ذکر شده، 6 جداساز آونگی‌اصطکاکی دوقوسی و 15 جداساز آونگی‌اصطکاکی سه‌قوسی با ابعاد و ضرایب اصطکاک متفاوت، جهت در نظر گرفتن گستره‌ای مناسب از دوره تناوب‌ها به‌کار برده شد. سپس از روش تحلیل تاریخچه زمانی غیرخطی برای محاسبه پاسخ‌های لرزه‌ای مدل‌ها استفاده گردید. بدین منظور، هفت شتابنگاشت از پایگاه داده معتبر انتخاب و به ساختمان‌ها اعمال شد. پاسخ‌های لرزه‌ای هریک از مدل‌ها شامل شتاب طبقات، جابه‌جایی بیشینه سیستم جداسازی، جابه‌جایی نسبی بین طبقات و برش پایه سازه محاسبه و تحلیل شد. نتایج نشان می‌دهد ضربه لرزه‌ای، برخی پاسخ‌ها را به میزان قابل‌توجهی افزایش داده است. به عنوان مثال، شتاب طبقه و تغییرمکان نسبی بین طبقه‌ای برای ساختمان با جداساز سه‌قوسی بر اثر ضربه به ترتیب 2 و 6 برابر شده است. در نتیجه، ممکن است مقدار فواصل لرزه‌ای محاسبه ‌شده براساس نشریه 360 کافی نباشد و باعث ایجاد ضربه و افزایش پاسخ‌های ساختمان به میزان قابل‌توجهی گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of Near-Field Earthquake-Induced Pounding in Building with Friction Pendulum Bearing Considering Seismic Gap of 360 Standard

نویسندگان [English]

  • Ayoub Shakouri
  • Gholamreza Ghodrati Amiri
  • Ali Asghar Kaviani
Natural Disasters Prevention Research Center, Iran University of Science and Technology, Tehran, Iran.
چکیده [English]

In this paper, the effect of seismic pounding of adjacent structures on buildings isolated by double (DFPB) and triple friction pendulum bearings (TFPB) is investigated. The seismic gaps between buildings are calculated based on the Instruction for Seismic Rehabilitation of Existing Buildings, standard No. 360 of Iran, which is not considered for friction pendulum bearings in the previous studies. To this end, a three-dimensional single-story building model is created in the MATHLAB program considering two scenarios including the case without pounding and the case with it. In addition, fifteen different TFPBs and six DFPBs are utilized as seismic isolators to cover a wide range of fundamental periods of the isolation system. Finally, nonlinear time history analyses with seven pairs of ground motion records are conducted to obtain some of the seismic responses of buildings including base shear, drift, story acceleration and maximum displacement of the isolation system. The results show that the seismic pounding considerably increases responses of base-isolated buildings. For example, the floor acceleration and the drift ratio of isolated building with TFPB increased 2 and 6 fold because of seismic pounding. It shows that the seismic gaps calculated by the formula of standard No. 360 may not be sufficient to prevent severe seismic poundings and increase of seismic responses.

کلیدواژه‌ها [English]

  • Base Isolation
  • Seismic pounding
  • Double and Triple Friction Pendulum Bearing
  • The 360 Standard
  • Nonlinear Time History Analysis

مراجع

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