ارزیابی تأثیر سامانه‌های جداساز لرزه ای لاستیکی هسته سربی و اصطکاکی آونگی تک قوسی با دوره تناوب‌های مختلف در بهبود رفتار لرزه ای ساختمان‌های فولادی

نوع مقاله : علمی - پژوهشی

نویسنده

دانشیار، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

چکیده

در مطالعه حاضر، ارزیابی عملکرد لرزه‌ای ساختمان‌های فولادی بر روی دو نوع سامانه جداساز لرزه‌ای تحت زلزله‌های حوزه دور از گسل مورد بررسی قرار گرفته است. جداسازهای مورداستفاده، جداساز لاستیکی هسته سربی و جداساز آونگی تک قوسی می‌باشند. جهت مقایسه رفتار این جداسازها زمان تناوب مؤثر به‌عنوان یکی از مهم‌ترین خصوصیات جداساز انتخاب و زمان تناوب مؤثر جداسازها 2/5، 3/5 و 4/5 در نظر گرفته شده است. سه ساختمان فولادی دارای قاب خمشی فولادی ویژه 3، 7 و 12 طبقه بر روی جداگرها قرار گرفته و تحلیل شده‌اند. این سه ساختمان نمایانگر ساختمان‌های کوتاه مرتبه، میان مرتبه و بلندمرتبه می‌باشند. در این پژوهش، اثر این دو نوع جداساز لرزه‌ای در کاهش پاسخ شتاب ساختمانها و تغییرمکان نسبی آنها مورد بررسی قرار گرفته است. نتایج نشان می‌دهند کارایی هر دو نوع سامانه جداساز لاستیکی هسته سربی و جداساز اصطکاکی تک قوسی با افزایش ارتفاع ساختمان کاهش پیدا می‌کند. میزان کاهش کارایی توسط سامانه جداساز آونگی تک قوسی 14 درصد نسبت به جداساز لاستیکی هسته سربی بیشتر می باشد. افزایش دوره تناوب طبیعی هدف (کاهش سختی جداساز) در کاهش پاسخ ساختمان‌ها در سامانه جداساز لاستیکی هسته سربی به طور متوسط 27 درصد نسبت به سامانه جداساز اصطکاکی تک قوسی عملکرد بهتری دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluating the Effect of Using Lead Rubber Seismic Isolator System and Friction Pendulum System with Different Periods in Improving the Seismic Behavior of Steel Framed Buildings

نویسنده [English]

  • Houshyar Eimani kalehsar
Associate professor, Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Abstract



In the present study, the evaluation of the seismic performance of steel framed buildings on two types of seismic isolation systems under far-fault earthquakes has been investigated. The isolator used are lead rubber bearing and single arc friction pendulum system. In order to compare the behavior of these isolators, the effective time period is considered as one of the most important properties of the isolator. The effective time period of the isolators is 2.5, 3.5 and 4.5. Three types of steel framed buildings with special moment resistant steel frames of 3, 7 and 12 stories are placed on these isolators. These three buildings represent low-rise, mid-rise and high-rise buildings. The effect of these two types of seismic isolators has been investigated in reducing the acceleration response and the relative displacement(drift) of the floors. The results show that the efficiency of both types of lead rubber bearing and single arc friction pendulum system decreases with the increase in the height of the building. The efficiency of the single arc friction pendulum system is 14% lower than that of the lead rubber bearing. Increasing the target natural period (decreasing the stiffness of the isolator) in reducing the response of the buildings in the lead rubber bearing has an average of 27% better performance than the single arc friction pendulum system.

کلیدواژه‌ها [English]

  • Keywords: Lead Rubber Bearing
  • Single Arc Friction Pendulum System
  • Far-Fault Earthquake
  • Special Moment Resistant Frame
  • Steel Framed Building
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