تعیین ستون بحرانی در پدیده فروپاشی پیش‌رونده در قاب خمشی فولادی با ملاحظه اثر اندرکنش خاک و سازه به دو روش مستقیم و غیر مستقیم

نوع مقاله : مقاله پژوهشی

نویسندگان

استادیار؛ گروه مهندسی عمران، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

پدیده فروپاشی پیش‌رونده در مقوله پدافند غیرعامل اهمیت بسیار بالایی دارد. با توجه به افزایش تهدیدات امنیتی و تروریستی در دهه‌های اخیر و گسترش روز افزون مسائلی از این دست، این پدیده بیش از پیش خود را نشان داده است. اندرکنش خاک و سازه نیز علمی جوان در مهندسی عمران به شمار می‌رود. رفتار سازه تحت اثر اندرکنش خاک و سازه تغییر می‌کند و روش‌های مختلفی نیز برای مدل‌سازی این پدیده در منتشرات سال‌های اخیر ارائه شده است. مسئله اصلی تحقیق حاضر تعیین ستون بحرانی در پدیده فروپاشی پیش‌رونده در قاب خمشی فولادی با ملاحظه اثر اندرکنش خاک و سازه به دو روش مستقیم و غیر مستقیم می‌باشد. پدیده فروپاشی پیش‌رونده در تحقیق حاضر به کمک سناریوی حذف ستون انجام شده است. همچنین اثر اندرکنش خاک و سازه به کمک دو روش مستقیم و غیر مستقیم در دو نرم‌افزار Sap و پلاکسیس مدل‌سازی شده است. قاب‌های فولادی دوبعدی به تعداد طبقات متفاوت به ترتیب 5، 10، 15 و 20 طبقه ساخته شده‌اند و به وسیله تحلیل استاتیکی غیر خطی تحلیل شده و با سناریوی حذف ستون گوشه و میانی مورد بررسی قرار گرفته‌اند. پارامترهای مختلفی مانند ضریب رفتار، برش پایه، تغییر مکان نقطه عملکرد و تغییر مکان بالای گره حذف شده و گسترش مفاصل پلاستیک به‌عنوان شاخص‌های ارزیابی مطرح شدند. نتایج تحقیق حاضر نشان دادند که ستون‌های گوشه وضعیت بحرانی‌تری دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Determination of the Critical Column in the Phenomenon of Progressive Collapse of the Steel Bending Frame Considering the Effect of Soil-Structure Interactions with both the Direct and Indirect Methods

نویسندگان [English]

  • M. EmamiKorandeh
  • S. A. Hosseini
Assistant Professor; Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

The phenomenon of progressive collapse is very important in the management of structures as well as the discussions related to passive defense. Due to the increasing terrorist threats in recent decades and the prevalence of such issues, this phenomenon has become more pronounced. The soil-structure interaction is also a new science in civil engineering. The structure behavior changes due to interactions with the soil and the literature review reveals various methods that have been presented for modelling this phenomenon in recent years. The main problem of the present study is to determine the critical column in the phenomenon of progressive collapse in steel flexural frame by considering the effect of soil-structure interactions with both the direct and indirect methods. The phenomenon of progressive collapse in the present study has been done with the help of column deletion scenario. In addition, the effect of soil-structure interactions has been modeled using the two direct and indirect methods in both Sap and Plaxis software. The two-dimensional steel frames are made for 5, 10, 15 and 20 story structures and are analyzed by the nonlinear static analysis and examined by the corner and middle column removal scenario. Various parameters such as the coefficient of behavior, base shear, displacement of the operating point and top of the node displacement are removed and the expansion of plastic joints are proposed as evaluation indicators. The results of the present study shows that the corner columns are in a more critical condition and the effect of soil-structure interactions in the direct method is much more significant.

کلیدواژه‌ها [English]

  • Bending Steel Frame
  • Progressive Collapse
  • Pushover Analysis
  • Soil-Structure Interactions
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