اثر مؤلفه دورانی شتاب‎نگاشت‎های لرزه‌ای حوزه نزدیک گسل بر رفتار دیوار‌های پایه-گهواره‌ای مرکزگرا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی زلزله، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

2 استادیار، مهندسی سازه، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

سیستم‌های نوین باربر جانبی مرکزگرا، با متمرکز کردن خرابی‌ها در اعضای فیوز، باعث کاهش هزینه‌های تعمیر شده و امکان بهره‌برداری بدون وقفه را فراهم می‎آورند. دیوار برشی بتنی مرکزگرای گهواره‌ای جزو این سیستم‌ها محسوب می‌شود. در تحقیق حاضر، رفتار دیوارهای پایه-گهواره‌ای مرکزگرا تحت 25 شتاب‎نگاشت نزدیک گسل پالس مانند بررسی شد. اثر شتاب‌نگاشت‌های مزبور بر روی سازه‌ها در دو حالت با و بدون مؤلفه دورانی زلزله مورد بررسی قرار گرفت. به‌منظور مقایسه و در نظر گرفتن مؤلفه‌های دورانی، شش ترکیب بارگذاری لرزه‌ای در نظر گرفته‌ شده است. برای تحلیل‌ تاریخچه زمانی غیرخطی، سازه‎های دارای 4، 8، 12، 16 و 20 طبقه انتخاب شدند. مدل‌سازی‎ها در نرم‌افزار OpenSees  به‌صورت دو بعدی انجام شدند. نتایج نشان داد لحاظ مؤلفه دورانی زلزله می‌تواند پاسخ‌های سازه را افزایش دهد. به‌طوری‌که حداکثر شتاب، جابه‌جایی نسبی، خمش، برش طبقات، جابه‌جایی نسبی پسماند بام و نسبت تنش حداکثر کابل به‌ترتیب برابر با 24/6، 9/3، 10/4، 9/6، 623 و 11 درصد با لحاظ مؤلفه دورانی زلزله به‌صورت حداکثر، افزایش‌یافته است. در سیستم‌های دیوار پایه-گهواره‌ای مورد بررسی، حداکثر جابه‌جایی پسماند برابر با 0/01 درصد بود. در پایان می‌توان گفت در سیستم‌های پایه‌-گهواره‌ای مرکزگرا، زاویه شتاب‌نگاشت با مؤلفه گهواره‌ای حداکثر نسبت به زاویه شتاب‌نگاشت با مؤلفه افقی حداکثر، ممکن است پاسخ‌های بیشتری را ایجاد کند.

کلیدواژه‌ها

موضوعات

مراجع

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