اثر همزمان بار ضربه و آتش‌سوزی بر قاب‌های خمشی فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری زلزله، گروه عمران، واحد شهرکرد، دانشگاه آزاد اسلامی، شهرکرد، ایران

2 دکتری عمران، گروه عمران، واحد شهرکرد، دانشگاه آزاد اسلامی، شهرکرد، ایران

چکیده

برای محافظت سازه‌ها و نجات زندگی انسان‌ها در مقابل انفجار، درک صحیح از نحوه رفتار و اثر موج‌های انفجاری بر روی سازه‌ها، ضروری می‌باشد. از سویی سازه‌های فولادی حساسیت زیادی در برابر حرارت دارند. زوج انفجار و آتش در سازه‌های فولادی می‌تواند سبب بروز خرابی پیشرونده در سازه‌های فولادی شود. با توجه به اینکه معمولا انفجار در سازه‌های همراه با آتش سوزی است، بنابراین در این تحقیق اثر انفجار بر قاب‌های خمشی فولادی تحت شرایط آتش مورد بررسی قرار گرفت. به این منظور قاب خمشی فولادی هشت طبقه سه دهانه مدل‌سازی شده و تحت بارگذاری انفجار همزمان با اعمال آتش، به روش اجزاءمحدود مورد تحلیل دینامیکی غیرخطی قرار گرفته و نتایج در ترم‌های مقاومت، استهلاک انرژی، تغییرشکل و خرابی رخ داده در سازه مورد ارزیابی و مقایسه قرار گرفته‌اند. با توجه به نتایج این تحقیق، اعمال حرارت بر سازه تحت بار انفجار وضعیت سازه را بحرانی‌تر خواهد کرد. نتایج این تحقیق نشان می‌دهد اعمال حرارت بر قاب خمشی فولادی سبب کاهش ظرفیت برشی و استهلاک انرژی سازه و افزایش تغییرشکل و پتانسیل ایجاد خرابی پیشرونده در سازه خواهد شد. اعمال دمای 200 تا 800 درجه سانتی‌گرادی بر قاب خمشی فولادی باعث کاهش ظرفیت برشی و استهلاک انرژی قاب خمشی فولادی به ترتیب 8 تا 96 درصد و 5/5 تا 85 درصد نسبت به قاب فولادی تحت دمای محیط خواهد شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effect of impact load on steel frames under fire conditions

نویسندگان [English]

  • Fazlolah Rasoulizadeh 1
  • Davoud Tavakoli 2
1 Ph.D., Department of Civil Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
2 Assistant Professor, Department of Civil Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
چکیده [English]

To protect structures and save lives from destruction, a proper understanding of how impact load behave and act on structures is essential. On the other hand, steel structures are very sensitive to heat. Impact load and fire in steel structures can cause progressive failure in steel structures. Due to the fact that impact load is sometimes associated with fire, so in this study the effect of impact load on steel frames under fire conditions was investigated. For this purpose, the eight-story three-span steel frame is modelled and subjected to non-linear dynamic analysis by finite element method under impact load simultaneously with fire, and the results in terms of resistance, energy dissipation, deformation and failure in the structure are evaluated and compared. According to the results of this study, applying heat to the structure under the impact load will make the condition of the structure more critical. The results of this study show that applying heat to the steel frame will reduce the shear capacity and energy dissipation of the structure and increase the deformation and the potential for progressive failure in the structure. Applying temperature of 200 to 800 ° C on the steel bending frame will reduce the shear capacity and energy dissipation of the steel bending frame by 8 to 96% and 5.5 to 85%, respectively compared to the steel frame under ambient temperature.

کلیدواژه‌ها [English]

  • Steel frame
  • ّ Impact Load
  • Fire
  • Finite element method
  • Nonlinear dynamic analysis
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