زمین شناسی مهندسی

زمین شناسی مهندسی

بررسی عملکرد لرزه‌ای ساختمان‌های نامتقارن چند طبقه طراحی شده بر مبنای آیین‌نامه ASCE07-22 با استفاده از تحلیل‌های دینامیکی فزاینده غیرخطی

نویسندگان
1 دانشگاه آزاد اسلامی واحد علوم و تحقیقات
2 پژوهشگاه بین‌المللی زلزله‌شناسی و مهندسی زلزله
چکیده
در‌اکثر ‌آیین‌نامه‌های لرزه‌ای‌ کنونی، سختی ‌و مقاومت المان‌های مقاوم در برابر زلزله مستقل در نظر‌گرفته شده به گونه‌ای که تغییر مقاومت المان‌ها منجر به ‌تغییر در سختی المان‌ها نخواهد شد. مطالعات اخیر نشان می‌دهد که سختی و مقاومت این المان‌ها وابسته بوده و لذا نحوه محاسبه این پارامترها و آرایش مراکز جرم، سختی و مقاومت می‌تواند در تعیین پاسخ٬­های لرزه‌ای موثر باشد. در این تحقیق سه گروه طراحی ساختمان­٬های پنج طبقه و نه طبقه شامل مدل طراحی مبتنی بر آیین‌نامه لرزه­ای ASCE/SEI 07-22، مدل بالانس-25% و مدل متقارن مقاومتی با خروج از مرکزیت تسلیم نرمال شده (ed/A) 0 تا 15% به ­همراه یک مدل متقارن به کمک آنالیزهای استاتیکی غیرخطی و دینامیکی فزاینده غیرخطی مورد محاسبه و ارزیابی قرارگرفتند. نتایج نشان داد متوسط میانه شتاب طیفی در سطح عملکردی فرو ریزش در مدل بالانس-25% و مدل متقارن مقاومتی نسبت به مدل طراحی مبتنی بر آیین‌نامه ASCE/SEI 07-22 ، حدودا 18% افزایش داشته است که این افزایش به معنی ایمن بودن مدل‌های بالانس-25% و متقارن مقاومتی در مقایسه با مدل طراحی آیین نامه است. ضمنا متوسط نسبت حداکثر چرخش سقف‌ها و حداکثر دریفت جابجایی طبقات در سطح عملکردی فرو ریزش در مدل بالانس-25% و مدل متقارن مقاومتی نسبت به مدل طراحی آیین‌نامه ASCE/SEI 07-22 به ترتیب منجر به کاهش 100درصدی و 12درصدی شده است. لذا با توجه به نتایج فوق استنباط گردید که مدل طراحی مبتنی بر آیین ­نامه‌ ‌از پایین‌ترین و مدل­های بالانس-25% و متقارن مقاومتی از بالاترین عملکرد لرزه‌ای دینامیکی برخوردار هستند.
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