بررسی فروریختگی پیش رونده ی قابهای مهاربندی شده با بادبند زانویی در سازه های فولادی تحت بار آتش سوزی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه عمران، دانشکده مهندسی، دانشگاه یاسوج.

2 دانشکده مهندسی، دانشگاه علم و فناوری مازندران.

چکیده

در این تحقیق به بررسی فروریختگی پیش‌رونده قاب‌های مهاربندی شده با بادبند زانویی در سازه‌های فولادی تحت بار آتش‌‌سوزی بر اساس روش مدل‌سازی نرم‌افزاری پرداخته شد. به منظور انجام تحقیق قاب‌های فولادی 3 و 6 و 9 طبقه، با سیستم بادبندی زانویی هم‌محور و برون‌محور به شکل هشتی در نظر گرفته شد و با استفاده از روش نرم‌افزاری SAP و ABAQUS تحلیل و بررسی گردید. در این ‌خصوص در ابتدا با مدل‌سازی قاب‌ها در نرم‌افزار SAP، قاب‌ها تحلیل و طراحی گردید و مقاطع قاب‌ها مشخص شد. در ادامه قاب در نرم‌افزار ABAQUS تحت بار آتش سوزی تحلیل شد. سپس بعد از مشخص شدن المان‎های بحرانی، مجدداً در نرم‌افزار SAP قاب بدون و با حذف المان‌های بحرانی به صورت پی‌در‌پی تحت بار حریق تحلیل شد تا میزان انرژی نمونه قاب‌ها در هر حالت بررسی و مقایسه شود. براساس مطالعه انجام شده بر روی قاب با بادبند زانویی برون‌محور و هم‌محور مشخص گردید که نوع بادبند برون‌محور تأثیر بسیار قابل توجهی را بر کاهش انرژی قاب در مقایسه با سیستم بادبندی هم‌محور داشته است. قاب‌های 3 و 6 و 9 طبقه با بادبند برون‌محور زانویی، انرژی به ترتیب در حدود 35 و 50 و 65 درصد کمتر از قاب با بادبند هم‌محور زانویی را در خلال وقوع حریق و در بازه زمانی کل آن داشته است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of Progressive Collapse of Knee Braced Frame in Steel Structures under Fire Loading

نویسندگان [English]

  • Marzieh Akbari 1
  • Ali Mohammad Rousta 1
  • Ali Alipour 1
  • Hamed Enayati 2
1 Department of Civil Eng, Yasouj University,Yasouj,Iran
2 Department of Civil Engineering, Faculty of Engineering, Mazandaran University of Science and Technology, Mazandaran, Iran.
چکیده [English]

In this research, the progressive collapse of braced frames with knee braces in steel structures under fire load was investigated based on the software modeling method. In order to carry out the research 3, 6 and 9-story steel frames with coaxial and off-axis knee bracing systems were considered in the shape of inverted-V and were analyzed and analyzed using the software method and ABAQUS and SAP software. In this regard, at first, the frames were analyzed and designed by modeling the frames in SAP software, and the sections of the frames were determined. In the following, the frame was analyzed in ABAQUS software under the fire load. the frame without and with the removal of the critical elements was analyzed successively under the fire load in the SAP software to check and compare the energy of the frame samples in each case based on the results obtained from the analysis. Based on the study conducted on the frame with off-axis and coaxial knee bracing, it was determined that the bracing type of off-axis had a significant effect on reducing the energy of the frame compared to the coaxial bracing system. The 3,6 and 9-storyframes with off-axis knee bracing had 35%, 50% and 65% less energy than the frames with coaxial knee braces during the fire and in the entire time period.

کلیدواژه‌ها [English]

  • Progressive Collapse
  • Steel Structure
  • Knee Brace
  • Fire Load
  • Energy Dissipation

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