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اثر آتش‌سوزی بر رفتار تیر عمیق بتن سبک مسلح شده با آرماتور GFRP با در نظر گرفتن اثر فاصله خاموت‌ها: مطالعۀ آزمایشگاهی

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان
1 دانشجوی دکتری، دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران.
2 دانشیار، دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران.
3 استادیار، دانشکده فنی مهندسی، دانشگاه کربلا، کربلا، عراق.
چکیده
یکی از خطراتی که همواره سازه‌های بتن مسلح را تهدید می‌کند آتش‌سوزی است. بنابراین، هدف اصلی در این تحقیق، مقایسۀ رفتار تیر عمیق بتن سبک مسلح شده با آرماتور GFRP در شرایط قبل و بعد از آتش‌سوزی می­باشد. به این منظور چهار نمونۀ آزمایشگاهی تیر عمیق بتن سبک مسلح شده با میلگردهای GFRP، شامل دو نمونه با فاصلۀ خاموت 60 میلیمتر و دو نمونه با فاصلۀ خاموت 150 میلیمتر ساخته شده و به وسیلۀ آزمایش چهار نقطۀ خمشی مورد ارزیابی قرار می­گیرند. نتایج این تحقیق نشان می‌دهد که آتش‌سوزی موجب تغییر مود گسیختگی نمونه‌های آزمایشگاهی از برشی به خمشی می­شود و بار نهایی بر اثر آتش‌سوزی، در نمونۀ آزمایشگاهی با فاصلۀ خاموت 60 و 150 میلیمتر، به ترتیب 22 و  27 درصد افت می­کند. همچنین کاهش فاصلۀ آرماتورها از 150 میلی­متر به 60 میلی­متر در دمای معمولی و در نمونه­های تحت اثر آتش قرار گرفته، باعث افزایش بار نهایی به ترتیب به میزان 11.4 درصد و 19.2 درصد می­شود. آتش‌سوزی سبب پوسته شدگی و ترک‌خوردگی پوشش بتن می­شود اما در نمونه با فاصلۀ خاموت 60 میلیمتر، میزان آسیب‌های ناشی از آتش‌سوزی کمتر می­باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Assessing the Impact of Fire on the Behavior of GFRP-reinforced Lightweight Concrete Deep Beams with Varied Stirrup Spacing: An Experimental Analysis

نویسندگان English

Ali Mohammed Ali Alarjy 1
Amir Houshang Akhaveissy 2
Bahaa Al Abbas 3
1 PhD Student, Department of Civil Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran.
2 Associate Professor, Department of Civil Engineering, Faculty Engineering, Razi University, Kermanshah, Iran.
3 Assistant Professor, Department of Civil Engineering, Engineering Faculty, Kerbala University, Kerbala, Iraq.
چکیده English

Fire poses a constant risk to reinforced concrete (RC) structures, and as such, this study aimed to compare the performance of lightweight concrete (LC) deep beams reinforced with glass fiber-reinforced polymer (GFRP) before and after exposure to fire. Four experimental specimens of LC deep beams reinforced with GFRP rebars were fabricated and tested using a four-point bending method, including two specimens with 60 mm stirrup spacing and two with 150 mm stirrup spacing. The findings revealed that the failure mode of the specimens shifts from shear to bending after exposure to fire, and the ultimate load capacity decreases by 22% and 27% in the laboratory specimens with 60 mm and 150 mm stirrup spacing, respectively. However, reducing the stirrup spacing from 150 mm to 60 mm increases the ultimate load capacity by 11.4% and 19.2% at normal temperature and after exposure to fire, respectively. Fire caused spalling and cracking of the concrete cover, but the amount of damage was less severe in the specimen with a stirrup spacing of 60 mm.

کلیدواژه‌ها English

Deep Beam
Fire
Lightweight Concrete
GFRP Bars
Distance of Stirrups
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دوره 21، شماره 1 - شماره پیاپی 66
فنی و مهندسی
بهار 1403
صفحه 613-633

  • تاریخ دریافت 31 تیر 1402
  • تاریخ بازنگری 30 مهر 1402
  • تاریخ پذیرش 05 دی 1402