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دانشکده مهندسی عمران، دانشگاه صنعتی خواجه‌نصیرالدین طوسی
چکیده
تجربیات حاصل از زلزله‌های گذشته، حاکی از تأثیر قابلملاحظه‌ی پدیده‌ی اندرکنش خاک و سازهبر پاسخ‌های دینامیکی سازه‌های مرتفع، حجیم، وزین و سخت مستقر روی خاک‌های نسبتاً نرم است. کنترل تأثیر پدیده‌ی مذکور بر قابلیت اعتماد لرزه‌ایساختمان‌ها با سیستم نوین قالب‌تونلی، نظر به وزن زیاد و سختی قابل‌توجه سیستم، ضروری به نظر می‌رسد. در این مطالعه، خاک زیر ساختمان‌های قالب‌تونلی 5 و 10 طبقه به کمک فنرهایی به‌صورت خطی مدل شده و پس از تحلیل، ضمن کنترل پاسخ‌ها، با رویکردی احتمالاتی، سطح عملکرد ساختمان‌ها و ضرایب اطمینان در برابر لغزش و واژگونی حین زلزله در دو حالت بستر صلب و انعطاف‌پذیر مورد ارزیابی و مقایسه قرار گرفته است. نتایج نشان می‌دهد، با افزایش ارتفاع ساختمان و شدت زلزله، پدیده‌ی اندرکنش خاک‌و‌سازه بر پاسخ‌های سازه شامل برش و جابهجایی طبقات و نیز موقعیت شروع خرابی‌ها مؤثر بوده و نسبت به بستر صلب، می‌تواند احتمال رسیدن المان‌ها به اولین سطوح خرابی را تا 30 درصد و احتمال لغزش و واژگونی کلی ساختمان را حداقل 10 درصد افزایش دهد. به نظر می‌رسد که بهخصوص در مناطق با لرزه‌خیزی بالا و خاک‌های نرم، پدیده‌ی نامبرده می‌تواند سبب کاهش بازه‌ی قابلیت اعتماد سازه‌های بلند در حصول به عملکردهای از پیش تعیین شده گردد.
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