بررسی مقایسه ای عملکرد سیستم های قاب خمشی و دیوار بار بر در برابر خرابی پیش‌رونده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران

2 مرکز تحقیقات خیبر، دانشکده پدافند غیرعامل، دانشگاه جامع امام حسین، تهران، ایران

چکیده

خرابی  پیشرونده را می توان ناشی از گسیختگی و ناپایداری قسمت کوچکی از سازه تحت عواملی مانند: انفجار، آتش سوزی، زلزله، برخورد  وسایل نقلیه و خطاهای ناشی از طراحی و اجرای ساختمان دانست که با یک عملکرد زنجیره ای به تدریج، گسترش پیدا  می‌کند و درنهایت منجر به خرابی قسمت مهمی از سازه  می‌گردد. سیستم دیوار باربر بتنی یکی از سیستم‌های سازه ای مناسب برای آن هاساختمان‌های میان مرتبه به شمار  می‌رود که با توجه به تعداد دیوارها در پلان و کاهش سهم نیروی جانبی آنها، این سیستم علاوه بر مقاوم بودن در برابر زلزله، از نظر حجم مصالح مصرفی نیز اقتصادی است و می‌توان آن را با سرعت، دقت و کیفیت بالایی اجرا کرد. در این تحقیق اثر خرابی پیشرونده ناشی از حذف ناگهانی و تدریجی المان‌های باربر بحرانی بر روی سیستم دیوار باربر بتنی مورد بررسی قرار گرفته و عملکرد آن با سیستم قاب خمشی بتنی مقایسه  شده است. حذف ناگهانی المآن های باربر ناشی از اثر ضربه ،انفجار یا برخورد وسایل نقلیه و حذف تدریجی ناشی از افت خواص مکانیکی مصالح و انبساط المان های باربر در معرض آتش سوزی در نظر گرفته شده است.  پتانسیل خرابی پیشرونده ناشی از حذف المان های باربر بر روی اعضای باربر مجاور و پایداری کلی آن هاساختمان ها، در موقعیت های مختلفی از طبقات و پلان، توسط تحلیل های حرارتی ،دینامیکی غیرخطی و استاتیکی غیرخطی( Pushdown Analysis) در سیستم های سازه ای مورد مطالعه، ارزیابی شده است. مقایسه بین نتایج تحلیل های Pushdown  انجام شده در هر دو سیستم ، نشان‌دهنده پایداری و مقاومت بسیار بالاتر، سختی بیشتر و شکل‌پذیری شکل پذیری کمتر سیستم دیوار باربر بتنی نسبت به سیستم قاب خمشی بتنی در برابر خرابی پیش رونده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Development of an efficient structural system against the progressive collapse of explosive loads for protective measures

نویسندگان [English]

  • Ahmad Shokoohfar 1
  • Ferydoon Khosravi 2
1 Department of civil engineering, Azad University of Qazvin, Qazvin, Iran
2 Kheybar Group, Protective Structures department, Jame emam hossein univ., Tehran, Iran
چکیده [English]

Progressive collapse can be caused by the failure and instability of a small part of the structure that gradually develops as a chain function and eventually leads to the collapse of an important part of the structure. Progressive collapse may happen due to explosion, fire, earthquake, vehicle collision and errors in the design and construction of building with any system type. Reinforced concrete (RC) load-bearing wall system is one of the appropriate structural systems for average height buildings that Based on the number of walls in plan and reduction in lateral force contribution, this system in addition to its strength against earthquake, according to volume of construction materials is economical. It can be constructed with high speed, accuracy, and quality. In this thesis, the effect of progressive collapse on the RC load-bearing wall system has been studied and its performance is compared to the RC moment frame. For this purpose, three-dimensional models of 10-story structures with the same plan in both systems, have been selected. The effects of geometric and material nonlinearity are considered and cross sections are modeled by fiber elements. To ensure the accuracy of modeling by fiber section method, the analysis results are validated by an experimental model of RC load-bearing wall.

کلیدواژه‌ها [English]

  • Progressive collapse : RC moment frame : Fiber section method : Pushdown analysis : Column Removal
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