ارزیابی رفتار سازه‌های نامنظم هندسی فولادی با سیستم قاب خمشی تحت سناریوهای مختلف حذف ستون

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده فنی مهندسی، دانشگاه آیت ا... بروجردی (ره)، بروجرد ایران.

2 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه دامغان

10.22091/cer.2021.6905.1244

چکیده

در این مقاله، تأثیر نامنظمی هندسی در پلان بر روی رفتار سازه‌های فولادی تحت خرابی پیشرونده بررسی می‌شود. ابتدا، سه سازه با در نظر گرفتن دو حالت منظم و نامنظمی هندسی طراحی می‌شوند. سپس، تأثیر دو پلان نامنظمی و منظمی روی قاب‌های خمشی فولادی مورد بررسی قرار می‌گیرد. الگوهای خرابی ساختمان‌ها مورد مطالعه قرار گرفته و تحت هفت سناریوی مختلف حذف ستون به کمک تحلیل استاتیکی و دینامیکی غیرخطی با یکدیگر مقایسه می‌شود. در تحلیل‌های دینامیکی غیرخطی، تغییرمکان گره در بالای ستون حذف شده و نیروی اضافی ایجاد شده در ستون مجاور آن مورد بحث و بررسی قرار می‌گیرد. علاوه بر این، ظرفیت و مقاومت ستون‌ها در تعیین پایداری و توان آن‌ها در برابر خرابی تعیین می‌شود. در تحلیل‌های استاتیکی غیرخطی، منحنی ظرفیت و نسبت نیروی تسلیم بعد از حذف ستون استخراج گردیده است. نتایج نشان داد که یک سازه نامنظم در بیشتر موارد حذف ستون، مستعد فروریزش و خرابی است. همچنین، با مقایسه بین سازه منظم و نامنظم دریافت شد که نسبت تقاضا به ظرفیت ستون‌ها در سازه‌های نامنظم به طور میانگین بین 5/1 تا 2 در مقایسه با سازه‌های منظم است.

کلیدواژه‌ها


عنوان مقاله [English]

An Investigation on Irregular Steel Moment-Frame Structure Under Different Column Removal Scenarios

نویسندگان [English]

  • Masoud Ahmadi 1
  • Mehdi Ebadi-Jamkhaneh 2
1 Department of Civil Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran
2 Department of Civil Engineering, School of Engineering, Damghan University.
چکیده [English]

This research examines the effect of plan irregularities on the progressive collapse of steel structures. Firstly, the three structures, regular and irregular are designed. Secondly, the effect of the two plan irregularities on the progressive collapse of moment resisting frame assessed. The collapse patterns of the buildings are analyzed and compared under seven loading scenarios using non-linear dynamic and pushdown analyses. In the non-linear dynamic analyses, node displacements above the removed columns and the additional force on the columns adjacent to them are discussed. Furthermore, the strength and capacity of the columns are compared to determine their susceptibility to collapse. In the non-linear static analyses, the pushdown curve and yield load factor of the structures are obtained after column removal. The results indicate that an irregular structure collapses in most of the column removal scenarios. Moreover, when comparing regular and irregular structures, the demand force to capacity ratio (D/C) of the columns in the irregular structures is on average between 1.5 and 2 times that of the regular ones.

کلیدواژه‌ها [English]

  • Progressive collapse
  • Irregularity
  • Steel Building
  • Non-linear Dynamic Analysis
  • Pushdown Analysis
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