مهندسی سازه و ساخت

مهندسی سازه و ساخت

مطالعه آزمایشگاهی و عددی رفتار پس از آتش‌سوزی مقاطع فولادی با پوشش‌های ضد حریق

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانش آموخته کارشناسی ارشد، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 دانشیار مهندسی عمران-سازه، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران
10.22065/jsce.2025.532061.3765
چکیده
در این مقاله با هدف بررسی چگونگی تأثیر پوشش‌های ضد حریق در بهبود رفتار پس از آتش مقاطع فولادی تحت بارگذاری محوری فشاری، مقاومت پسماند ستون‌های فولادی توخالی با پوشش‌های ضد حریق پس از قرارگیری در معرض دماهای بالا و سردشدگی، با استفاده از انجام مطالعات آزمایشگاهی و عددی، مورد ارزیابی قرار گرفته است. برای انجام این پژوهش، نمونه‌ها از مقاطع فولادی قوطی شکل که با پوشش ضد حریق معدنی سیمانی و گچی پوشش داده شده بودند، انتخاب گردید. ابتدا کوره به دماهای 400، 600، 800 و 1000 درجه سانتی‌گراد رسانده شده سپس نمونه‌ها در کوره الکتریکی تحت دماهای مدنظر به مدت یک ساعت قرار داده شدند. بعد از خنک شدن نمونه‌ها در دمای محیط طی 24 ساعت، آزمایش کشش برای بدست آوردن مشخصات مکانیکی فولاد و آزمایش ظرفیت باربری فشاری برای ارزیابی مقاومت فشاری پسماند نمونه‌ها انجام شد. نتایج نمونه‌های با پوشش ضد حریق با نمونه‌های بدون پوشش مقایسه شد. در ادامه، یک مدل عددی نیز با استفاده از نرم افزار عناصر محدود ABAQUS توسعه داده شد، که بتوان برای انجام مطالعات پارامتریک از آن بهره گرفت. نتایج مدل عددی ایجاد شده با نتایج آزمایشات انجام یافته مقایسه شده و تایید صحت شد. آنچه از نتایج مقاومت پسماند مقاطع حاصل شد این است که استفاده از پوشش‌های ضد حریق، مقاومت پسماند مقاطع را در دمای 800 و 1000 درجه سانتی‌گراد نسبت به نمونه بدون پوشش در همان دما حدود 30 تا 34 درصد افزایش داده است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Experimental and numerical study of the post-fire behavior of steel sections with fireproof coating

نویسندگان English

elham hedayati 1
shirin esmaeili niari 2
elham ghandi 2
1 MSC Graduate of Structural Engineering, Faculty of Technical and Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
2 Associate Professor, Faculty of Technical and Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده English

In this paper, aiming to examine how fireproof coatings influence the post-fire behavior of steel sections under axial compressive loading, the residual strength of hollow steel columns with fireproof coatings after exposure to high temperatures and cooling was assessed through experimental and numerical studies. For this research, samples were selected from hollow steel sections coated with mineral cement and gypsum-based fireproof coatings. Initially, the furnace was brought to temperatures of 400, 600, 800, and 1000 degrees Celsius, and then the samples were placed in the electric furnace at the desired temperatures for one hour. After the samples were cooled to room temperature over 24 hours, a tensile test was conducted to obtain the mechanical properties of the steel, and a compressive load-bearing test was performed to evaluate the residual compressive strength of the samples. The results of the fireproof-coated samples were compared with those of the uncoated samples. Next, a numerical model was developed using the finite element software ABAQUS, which can be used to perform parametric studies. The results of the numerical model were compared with the results of the experiments and verified. The findings regarding the residual strength of the sections showed that the use of fireproof coatings increased the residual strength of the sections at 800 and 1000 degrees Celsius by approximately 30 to 34 percent compared to the uncoated samples at the same temperature.

کلیدواژه‌ها English

Mechanical properties of steel
fireproof coating
Experimental model
residual strength
numerical model
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  • تاریخ دریافت 05 مرداد 1404
  • تاریخ بازنگری 10 آبان 1404
  • تاریخ پذیرش 03 دی 1404