ارزیابی احتمالاتی فروریزش تدریجی قابهای خمشی فولادی (معمولی، متوسط و ویژه) تحت زلزله

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی عمران، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 استادیار، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

فروریزش ساختمان سطحی از عملکرد سازه است که در آن میزان صدمات جانی و مالی به حداکثر خود می رسد، لذا این رخداد می تواند ناگوارترین حادثه در صنعت ساخت و ساز باشد. با توجه به احتمال وقوع زلزله های مخرب در نقاط مختلف جهان، ارزیابی دقیق تر فروریزش سازه ها تحت زلزله و پیشگیری آن از چالش های مهم مهندسی سازه می باشد. در این راستا ارائه ی مدلهائی بر مبنای مطالعات آزمایشگاهی، لحاظ کردن پارامترهای موثر و در نظر گرفتن زلزله های مناسب می تواند گامی در جهت نیل به این هدف باشد. در این تحقیق یک سازه ی 5 طبقه ی فولادی با سیستم های قاب خمشی معمولی ، متوسط و ویژه (شکل پذیری های کم، متوسط و زیاد) مطابق ضوابط آئین نامه های داخلی طراحی شده اند. اثر کاهندگی مقاومت و سختی المانهای سازه بر اساس نتایج مدل های آزمایشگاهی لحاظ شده است و نقش شکل پذیری در ظرفیت فروریزش قابهای خمشی فولادی مورد نظر به صورت احتمالاتی بررسی شده است. به این منظور تحلیل های دینامیکی افزاینده تحت50 زوج شتابنگاشت پیشنهادی دستورالعمل FEMA P695  انجام شده است و منحنی های شکنندگی سطوح عملکرد مختلف توسعه یافته است. نتایج  ظرفیت فروریزش بالاتر قاب خمشی فولادی ویژه را نسبت به قابهای خمشی متوسط و معمولی نشان داد. در سطح احتمال 50 درصد، ظرفیت فروریزش قاب خمشی ویژه نسبت به قاب خمشی متوسط 34 درصد و نسبت به قاب خمشی معمولی 66 درصد افزایش نشان داد. همچنین نتایج نشان داد که به ازای شتابهای طیفی فروریزش مختلف، کاربرد قاب خمشی ویژه به جای قاب خمشی متوسط و معمولی می تواند به ترتیب  تا 30 و50 درصد احتمال فروریزش را کاهش دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Probabilistic assessment of steel moment frames incremental collapse (ordinary, intermediate and special) under earthquake

نویسندگان [English]

  • Kourosh Mehdizadeh 1
  • Abbas Karamodin 2
1 PhD Candidate, Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 Assistant Professor, Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

Building collapse is a level of the structure performance in which the amount of financial and life loss is maximized, so this event could be the worst incident in the construction. Regarding to the possibility of destructive earthquakes in different parts of the world, detailed assessment of the structure's collapse has been one of the major challenges of the structural engineering. In this regard, offering models based on laboratory studies, considering the effective parameters and appropriate earthquakes could be a step towards achieving this goal. In this research, a five-story steel structure with a system of ordinary, intermediate and special moment frame (low, intermediate and high ductility) has been designed based on the local regulations. In this study, the effect of resistance and stiffness deterioration of the structural elements based on the results of the laboratory models have been considered and the ductility role in the collapse capacity of steel moment frames has been investigated as probabilistic matter. For this purpose, incremental dynamic analysis has been done under 50 pairs of earthquake records proposing FEMA P695 instruction and fragility curves of various performance levels are developed. Results showed higher collapse capacity of special moment steel frame than the intermediate and ordinary moment frames. In the 50 percent probability level, the collapse capacity of special moment frame increased 34 % compared to the intermediate moment frame and 66 % to the ordinary moment frame. Also, the results showed that for different collapse spectral accelerations, the use of special moment frame instead of intermediate and ordinary moment frames reduces the collapse probability to 30 and 50 % respectively.

کلیدواژه‌ها [English]

  • Steel moment frame
  • Ductility
  • Deteriorating
  • Collapse Capacity
  • Incremental Dynamic Analysis
  • FEMA P 695 instruction
  • Fragility curve
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