بررسی تاثیر جرم و موقعیت ارتفاعی میراگر جرمی تنظیم شونده در کنترل ارتعاشات ناشی از باد ساختمان‏های بلند

نوع مقاله : مقاله پژوهشی

نویسندگان

• نهمت خدایی ¹
• حامد تیموری ²

¹ گروه آموزشی عمران دانشگاه آزاد اسلامی واحد خورموج

² گروه آموزشی عمران، دانشگاه آزاد اسلامی واحد خورموج

10.22067/jfcei.2022.70265.1039

چکیده

میراگر جرمی تنظیم شونده یا TMD از تجهیزات مهم برای کنترل ارتعاشات سازه‎ها می‌باشد. مطالعات پیشین در زمینه تأثیر TMD برای کنترل ارتعاشات سازه‎ها در مقابل باد، عمدتاً برای ویژگی‏های ثابتی از میراگر انجام شده است. در این تحقیق، تأثیر پارامترهای جرم و ارتفاع محل نصب TMD در کنترل ارتعاشات طولی و عرضی ناشی از باد ساختمان‎های بلند مطالعه شد. برای این منظور، ساختمان بلندی با پلان مربع و ارتفاع 400 متر به صورت تیر طره‎ای قائم چند درجه آزادی با جرم‎های متمرکز در گره‎ها مدل‎سازی شد. ارتعاشات سازه در برابر باد به ازای محدوده وسیعی از پارامترهای مورد مطالعه، با استفاده از تحلیل حوزه فرکانس و تئوری ارتعاشات تصادفی محاسبه شد. مطابق نتایج، با افزایش جرم میراگر، ارتعاشات سازه و TMD کاهش می‎یابد. برای مثال، کاهش شتاب عرضی تراز فوقانی سازه برای میراگر جرمی 100 و 600 تنی واقع در تراز فوقانی، به ترتیب 31 و 48 درصد به دست آمد. با افزایش ارتفاع محل نصب TMD، تأثیر کنترلی آن افزایش و جابه‌جایی TMD تا حد کمی کاهش می‎یابد. به‎طور نمونه، برای میراگر جرمی 300 تنی نصب شده در ارتفاع‎های 320 و  400 متری، کاهش شتاب عرضی سازه به ترتیب 72/33 و 28/41 درصد و  انحراف معیار جابه‌جایی TMD به‎ترتیب 68/58 و 92/54 سانتی‌متر تعیین شد.

کلیدواژه‌ها

• میراگر جرمی تنظیم شونده
• ساختمان بلند
• ارتعاشات ناشی از باد
• پاسخ طولی باد
• پاسخ عرضی باد

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عنوان مقاله [English]

Investigation of the effect of the mass and installation height of TMD system on the wind-induced vibration control of tall buildings

نویسندگان [English]

• Nahmat Khodaie ¹
• Hamed Teymouri ²

¹ Islamic Azad University, Khormouj Branch, Khormouj, Iran.

² Islamic Azad University, Khormouj Branch, Khormouj, Iran.

چکیده [English]

Tuned mass damper(TMD) is an efficient tool to control wind-induced vibrations of tall buildings. Previous studies on the effect of TMD are generally limited to specific conditions. In the present study, the effect of the mass and installation height of TMD on the wind-induced vibration control of tall buildings are investigated. An example of tall building with the height 400 m and square variable cross section is presented. The analytical model of the building is assumed as a multi-degrees-of-freedom vertical cantilever beam with the masses lumped at the nodes. The wind-induced responses of the structure are computed using the frequency domain analysis and the random vibration method for a wide range of studied parameters. The results indicated that the vibrations of the structure and TMD system decreases with increasing the mass of the TMD. For instance, the 100 and 600-ton TMD installed at top-floor reduced the top-floor crosswind acceleration by 31 and 48 percent, respectively. By increasing the installation height, the control effectiveness of the system increases, while the vibration of the TMD does not change considerably. For a 300-ton TMD installed at 320 and 400 m heights, the crosswind acceleration reduced by 33.72 and 41.28 percent and the RMS displacement of the TMD at these heights were 58.68 and 54.92 cm, respectively.

کلیدواژه‌ها [English]

• Tuned mass damper
• Tall building
• Wind-induced vibrations
• Cross wind
• Along-wind

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