بررسی اثرات میراگر جرمی چندگانه در کاهش پارامترهای لرزه ای ساختمانهای بلند قاب خمشی فولادی منظم و دارای نامنظمی در پلان تحت زلزله های حوزه دور و نزدیک

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

2 استادیار، دانشکده‌ مهندسی عمران، دانشگاه سمنان، سمنان، ایران

3 استاد، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

چکیده

میراگر جرمی تنظیم شده نوع جدیدی از سیستمهای کنترل سازه می باشد که باعث افزایش اتلاف انرژی میرایی تحت نیروهای خارجی در سازه می گردد. تاکنون در بیشتر موارد تنها یک میراگر جرمی تنظیم شده TMD (Tuned Mass Damper) در بام ساختمان و یا چند میراگر محدود در چندین نقطه در ارتفاع ساختمان نصب می شد، که این مستلزم در نظرگرفتن جرم قابل توجه در نقاطی از سازه به عنوان سربار و همچنین درنظر گرفتن فضایی قابل توجه برای نصب این جرم و از آن مهمتر پیش بینی جسمی که جرم مورد نیاز را تامین کند می باشد. لذا در این تحقیق کارایی میراگر جرمی تنظیم شده توزیعی در طبقات(MTMD) در ساختمان بلند مورد بررسی قرار گرفته و به اثرات میراگر جرمی چندگانه بر روی ساختمان های بلند قاب خمشی فولادی منظم و دارای نامنظمی در پلان پرداخته شده است. مدلهای 10،15،20 طبقه با پلان های منظم و دارای نامنظمی به شکل L,U در نرم افزار SAP2000 مورد تحلیل و طراحی قرار گرفته، سپس در نرم افزار OPENSEES مجهز به میراگر جرمی چندگانه شده و تحت رکوردهای دور و نزدیک از گسل تحلیل دینامیکی غیرخطی شده و مورد بررسی و مقایسه قرار گرفته اند. نتایج نشان می دهد که میراگر جرمی که در طبقات بام قرار گرفته اند از نظر برش حدود 40 درصد کاهش، از نظر جابجایی مطلق طبقات حدود 30 درصد کاهش و از نظر شتاب طبقات حدود 35 درصد کاهش بوده که باعث افزایش کارایی مدل ها شده و وضعیت لرزه ای آنها را بهبود بخشیده اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation the Effects of Multiple Tuned Mass Damper on Reduction of Seismic Parameters of Tall Buildings Regular and Irregular on Plan in Steel Flexible Structures Under Near and Far-Fault Earthquakes

نویسندگان [English]

  • mohsen khazaei 1
  • Reza Vahdani 2
  • Ali Kheyroddin 3
1 PhD student, civil engineering department, semnan university, semnan, Iran
2 Assistant Professor, Civil Engineering Department, Semnan University, Semnan, Iran
3 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

The tuned mass damper is one of the latest structural control system that helps the structure to damp the dynamics loads. So far using the Tuned Mass Damper (TMD) on the roof or a few dampers was installed at several points at the height of the building or other levels of the building was popular, but this system has some disadvantages like considering a significant mass as overhead which requires special material and enough space to install. Therefore, in this research the efficiency of Multiple Tuned Mass Damper (MTMD) in tall building is investigated. Also the effects of MTMD on regular and irregular tall moment resisting buildings are studied. The 10,15 and 20 story buildings with regular and irregular U and L shapes are modelled,analysed and designed, using the SAP 2000. Then the models equipped with MTMD and analysed in nonlinear dynamic mode under the earthquake records of the near and far fault , using OPENSEES. Afterwords, the models compared considering different earthquake records.finally the results showed the MTMD on the roof had seismic performance with 40% reduction of the base shear , 30% reduced absolute displacement of the stories and 35% smaller acceleration, which increased the efficiency of the models and the situation have improved their seismicity.

کلیدواژه‌ها [English]

  • Multiple Tuned Mass Damper
  • steel structure
  • Tall building
  • Irregularity on plan
  • Nonlinear dynamic analysis
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