مهندسی سازه و ساخت

مهندسی سازه و ساخت

ارزیابی تاب‌آوری لرزه‌ای سازه‌های بلندمرتبه دیاگرید بهینه همراه با میراگر لزج با محاسبه چرخه عمر

نوع مقاله : علمی - پژوهشی

نویسندگان
1 کارشناس ارشد، دانشکده عمران و منابع زمین، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران
2 استادیار/دانشکده عمران و منابع زمین/دانشگاه آزاد اسلامی واحد تهران مرکزی/تهران/ایران
3 کارشناس ارشد سازه، دانشکده مهندسی‌ عمران و منابع‌زمین، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران
چکیده
با افزایش جمعیت در شهرهای اصلی در کشور و محدود بودن حریم شهرها بیش‌ازپیش نیاز به سازه‌های بلندمرتبه ایمن احساس می‌شود. همچنین اکثر این شهرها مانند تهران در پهنه‌های لرزه‌ای با خطرپذیری بسیار زیاد قرار گرفته‌اند پس در نتیجه باید ضوابط لرزه‌ای در طراحی آنها اقناع شود. این تحقیق در ضمن ارزیابی عملکرد لرزه‌ای برای سازه‌های بلندمرتبه در سیستم قطری تحت تحلیل تاریخچه زمانی غیرخطی با رسم منحنی‌های شکست برحسب تغییر مکان نسبی در سه سطح نتیجه می‌شود برای استفاده از این سیستم سازه به دلیل اثر کاهش تغییر مکان نسبی به حدود پنجاه‌درصد ملزوم به استفاده از میراگر هستیم. برای دستیابی به هندسه مناسب در قاب قطری تحلیل بار افزون بر روی قاب‌ها اعمال شد و حاصل اثرگذاری شکل‌پذیری به دلیل طراحی بر روی میزان تغییر شکل را نشان می‌دهد که همیشه با زاویه المان قطری و سختی رابطه مستقیم نخواهد داشت. در ضمن با درنظرگرفتن دو المان استواری بر حسب برش پایه و چابکی بر حسب روز به ارزیابی میزان تاب‌آور بودن این سیستم برای سازه‌های بلندمرتبه می‌پردازد. ضمن تعریف حدود عملکردی، خسارت از طریق تشکیل مفصل پلاستیک در المان‌ها در نظر گرفته می‌شود و مدت‌زمان و هزینه موردنیاز برای بازگرداندن عملکرد سیستم به حالت اولیه از طریق تعویض یا ترمیم عضو برآوردشده است. تمامی تحلیل‌ها و طراحی‌ها در نرم‌افزار اجزا محدود برای دو حالت قاب‌های همراه با میراگر لزج و بدون این میراگرها برای دو تراز ارتفاعی ۱۶۸ و ۲۴۸ متر صورت‌گرفته ‌است. در نهایت به ارائه روشی برای ساخت شتاب‌نگاشت مصنوعی برای درنظرگرفتن اثر پس‌لرزه روی سازه‌های آسیب‌دیده بعد از زلزله اصلی ارائه می‌شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Evaluation of seismic resilience of high-rise structures by considering the life cycle

نویسندگان English

iman rafsanjaneasl 1
Abbas Ghasemi 2
Shaghayegh Nazari 3
1 MSc., Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
2 Assistant Professor/ Faculty of Civil Engineering and Earth Sciences/ Central Tehran Branch Islamic Azad University
3 MSc., Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
چکیده English

With the increase of population in the main cities in the country and the limited space of the cities, the need for high-rise safe structures is felt more and more. Also, most of these cities, like Tehran, are located in seismic zones with high risk, so as a result, seismic criteria must be satisfied in their design. This research, while evaluating the seismic performance of high-rise structures in the diagonal system under nonlinear time history analysis by drawing failure curves in terms of relative displacement in three levels, it is necessary to use this structural system due to the effect of reducing the relative displacement to about fifty percent. We are from damper. In order to achieve the appropriate geometry in the diagonal frame, additional load analysis was applied to the frames and the result shows the impact of the design's plasticity on the amount of deformation, which will not always have a direct relationship with the angle of the diagonal element and stiffness. At the same time, by considering two elements of stability in terms of base shear and agility in terms of days, it evaluates the resilience of this system for high-rise structures. While defining the functional limits, damage through the formation of plastic joints in the elements It is considered and the time and cost required to restore the system performance to the initial state through the replacement or repair of the member is estimated. All analyzes and designs have been done in finite element software for two cases of frames with viscous dampers and without these dampers for two height levels of 168 and 248 meters. Finally, a method for constructing artificial acceleration maps to consider the effect of aftershocks on damaged structures after the main earthquake is presented.

کلیدواژه‌ها English

Seismic resilience
high-rise diagrid structure
nonlinear time history analysis
pushover analysis
viscous damper
life cycle
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  • تاریخ دریافت 17 مرداد 1403
  • تاریخ بازنگری 30 مهر 1403
  • تاریخ پذیرش 17 آبان 1403