بررسی رفتار قاب‌های مهاربندی همگرای ویژه فولادی تحت بار آتش پس از زلزله

نوع مقاله : پژوهشی

نویسندگان

1 گروه عمران، دانشکدۀ مهندسی، دانشگاه فردوسی مشهد

2 گروه مکانیک، دانشکدۀ مهندسی، دانشگاه فردوسی مشهد

چکیده

وقوع آتش‌سوزی در اثر زمین‌لرزه یک مسئله مهم برای ساختمان‌ها در مناطق با لرزه‌خیزی متوسط تا زیاد است. در این مقاله به‌منظور ارائه بینش از اثرات آتش‌سوزی پس از زلزله در سازه‌های فولادی با استفاده از شبیه‌سازی اجزای محدود، رفتار قاب‌های مهاربندی همگرای ویژه فولادی در معرض این بارگذاری موردبررسی قرار می‌گیرد. شبیه‌سازی سازه تحت بار زلزله با استفاده از تحلیل تاریخچۀ زمانی غیرخطی انجام‌شده و با قرار دادن وضعیت سازه پس از زلزله به‌عنوان شرایط اولیه، تحلیل حرارتی‑مکانیکی با اعمال منحنی دما‑زمان بر روی اجزای در معرض آتش انجام‌شده است. نتایج تحلیل‌ها نشان داد که زمان مقاومت سازه در برابر حریق صرف‌نظر از مشخصه رکورد زلزله و سناریوهای آتش‌سوزی برای قاب‌های مهاربندی ویژه بسیار کوتاه بوده و اثرات ناشی زلزله قبلی بر روی آن ناچیز بوده است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of the Behavior of Special Steel Concentrically Braced Frames Under Post Earthquake Fire Loading

نویسندگان [English]

  • Mohamad rasol Kafash 1
  • abbas karamodin 1
  • Mohamad Moghiman 2
1 Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran .
چکیده [English]

The occurrence of fire following earthquake is an important issue for buildings in moderate to high seismic areas. In this paper, in order to provide an insight into the effects of post-earthquake fire in steel structures, using finite element simulation, the behavior of the special steel concentrically braced frames exposed to this loading is examined. Simulation of the structure under earthquake load was performed using nonlinear time histories analysis. By placing the post-earthquake structure as the initial condition, mechanical thermal analysis was carried out by applying the temperature-time curve on exposed elements. The results of the analysis showed that the resistance time of the fire structure, regardless of the characteristics of the earthquake record and the fire scenarios for the special steel concentrically braced frames, was very short and the effects of the previous earthquake on it were negligible.

کلیدواژه‌ها [English]

  • Post-Earthquake Fire
  • Sequential Analysis
  • Fire Resistance
  • Braced Frames
  • Overall Behavior
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