فصلنامه علوم و مهندسی زلزله

فصلنامه علوم و مهندسی زلزله

شناسایی ویژگی‌های دینامیکی سازه بادگیر بر اساس تحلیل حوزه فرکانس و حوزه زمان داده‌های آزمایشگاهی

نوع مقاله : مقاله پژوهشی

نویسنده
استادیار، گروه سازه، دانشکدۀ مهندسی عمران، دانشگاه یزد، یزد، ایران
چکیده
بادگیرها عناصر معماری منحصربه‌فردی هستند که با هدف تنظیم شرایط محیطی در معماری گذشتۀ کشورمان و به‌ویژه خانه‌های تاریخی شهر یزد استفاده می‌شده‌اند. علیرغم ارزش تاریخی و کارکردی این عناصر، رفتار دینامیکی سازه آنها مورد مطالعه چندانی قرار نگرفته است. انجام آزمون‌های شناخت ویژگی‌های دینامیکی بر روی سازه‌های تاریخی باید با آسیب حداقل به این سازه‌ها همراه باشد. به همین دلیل در سال‌های اخیر استفاده از آزمون غیر مخرب ارتعاش محیطی مبتنی بر تنها پاسخ و نه عامل تحریک، برای شناخت رفتار واقعی دینامیکی این نوع از سازه‌ها گسترش یافته است. بر این اساس، هدف مقاله حاضر شناسایی ویژگی‌های دینامیکی سازه بادگیر از طریق تعیین فرکانس‌های طبیعی، شکل مودی و نسبت میرایی مودهای مختلف دینامیکی با انجام آزمون ارتعاش محیطی است که به این منظور آزمون مذکور بر روی دو نمونه منتخب از بادگیرهای خانه‌های قاجاری شهر یزد انجام شد. قبل از انجام آزمون، به‌منظور تخمین شکل مودهای سازه‌ها جهت تعیین نقاط نصب شتاب‌سنج‌ها، تحلیل مقادیر ویژه بر روی مدل اجزای محدود هر دو سازه انجام شد. در نهایت تحلیل مودال عملیاتی بر روی نتایج آزمایش در نرم‌افزار آرتمیس و با استفاده از دو روش مبتنی بر جستار قله در حوزه فرکانس و یک روش شناسایی زیر فضای تصادفی در حوزه زمان، انجام شد و ویژگی‌های مودال استخراج و نتایج با هم مقایسه شدند.
کلیدواژه‌ها

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  • تاریخ دریافت 18 خرداد 1403
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