ارزیابی و مقایسه رفتار ساختمان های بلند با سیستم مهاربازویی و کمربند خرپایی با استفاده از منحنی های شکنندگی

نوع مقاله: علمی - پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

2 کارشناس ارشد مهندسی سازه، موسسه آموزش عالی علوم و فنون آریان، بابل، ایران

3 استادیار، دانشکده فنی و مهندسی، دانشگاه مازندران، بابلسر، ایران

4 کارشناس ارشد مهندسی زلزله، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، ایران

چکیده

در طراحی ساختمان‌های بلند، سه پارامتر مقاومت، سختی و پایداری بسیار مهم می‌باشند و هر چه ارتقاع ساختمان بلند‌تر می‌شود تاثیر سختی و پایداری در طراحی بهینه سازه، بیشتر می‌گردد و اثرات این دو فاکتور، جهت طراحی در برابر بارهای جانبی باد و زلزله، غالب می‌گردند. بهترین روش برای ارضا‌کردن این دو فاکتور، استفاده از فرم‌ها و مدل‌های ابتکاری سازه‌ها، به شکلی که ضمن حفظ سختی، با کاهش تغییر شکل‌ها و دریفت‌های ناشی از بارهای جانبی، پایداری سازه را افزایش دهد. سیستم قاب فولادی با کمربند خرپایی و مهار بازویی، یکی از سیستم‌های ابتکاری و جدید در سازه‌های بلند می‌باشد که استفاده از آن باعث کاهش قابل ملاحظه‌ای در مقادیر مصرفی فولاد سازه‌ای و هزینه های احداث ساختمان بلند می‌گردد.
در این تحقیق، دو قاب 5 دهانه 30و50 طبقه 2 بعدی بر اساس آیین‌نامه‌های رایج ایران با دوسیستم قاب خمشی و کمربند خرپایی با مهار بازویی، بارگذاری و در حالت LRFD طراحی گردید و سپس با استفاده از نرم افزار SAP2000 و روش تحلیل تاریخچه زمانی و اعمال 12 رکورد زلزله مختلف به سازه، مقادیر تغییر مکان‌ها استخراج و ماکزیمم دریفت نسبی طبقات هر قاب محاسبه گردید. با تعریف سه آستانه عملکردی IO، LS و CP و بر اساس شدت شتاب هر رکورد زلزله، مقادیر تابع احتمال گذشت دریفت سازه از آستانه-های عملکردی تعریف شده محاسبه گردید و پس از ترسیم منحنی‌های شکنندگی هر رکورد و مقایسه منحنی‌های شکنندگی حالت-های مختلف، نتیجه‌گیری شده‌است که استفاده از سیستم کمربند خرپایی و مهاربازویی در قاب‌های2 بعدی30 و50 طبقه، به طور متوسط به میزان12 تا 28 درصد باعث کاهش احتمال فراگذشت دریفت ماکزیمم طبقات از آستانه‌های تعریف شده می‌گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Assessment and Comparison of Tall Buildings with Outrigger and Belt Truss Systems Using Fragility Curves

نویسندگان [English]

  • Hamed Hamidi 1
  • Jafar Pakdaman 2
  • Ehsan Jahani 3
  • Hamid Rajabnejad 4
1 Assistant Professor, Faculty of Civil Engineering, Noshirvani University of Technology, Babol, Iran
2 MSc of Structural Engineering, Aryan Institute of Science and Technology, Babol, Iran
3 Assistant Professor, Faculty of Engineering, Mazandaran University, Babolsar, Iran
4 MSc of Earthquake Engineering, Faculty of Civil Engineering, Noshirvani University of Technology, Babol, Iran
چکیده [English]

In the design of high-rise buildings, three parameters such as resistance, hardness and stability are very important and when the height of building rises, effect of toughness and stability in optimum design will be dominate more than of the effects of these two factors against the lateral loads from wind and earthquake. The best ways to satisfy these two factors is the use of innovative forms and models of structures, so that, while maintaining stiffness, reducing deformation and drift caused by lateral loads, increase the stability of the structure. Outrigger and belt truss system are one of the innovative systems in high-rise structures that use it substantially reduces the consumption of structural steel and construction costs are high.
In this research, two 2D frame with 5 spans and 30 and 50 stories according to the Iranian codes were designed in two cases of: the moment frames and frames with outrigger and belt with. Then maximum displacements of nodes and maximum inter stories drifts calculated for every earthquake records with use of SAP2000 software and time history analysis and has defined three different threshold IO, LS, and CP and acceleration of each record based on the severity of the earthquake. Then curves were plotted for each case; the results indicate that the outrigger and belt truss system would reduce the maximum inter story drift about 12 to 28 percent.

کلیدواژه‌ها [English]

  • Belt truss
  • Outrigger
  • Fragility curve
  • Probability Function
  • Nonlinear time history analysis

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