بررسی و مقایسه تاثیر الیاف‌های فولادی، پلی‌پروپیلن و کورتا در بهبود رفتار خمشی تیرهای بتن مسلح

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده فنی و مهندسی، دانشگاه لرستان، خرم آباد، ایران

2 دانشکده فنی و مهندسی، دانشگاه صنعتی نوشیروانی، بابل، ایران

چکیده

مزایای سازه­های بتن آرمه نسبت به دیگر سازه­ها، سبب شده که امروزه بتن به یکی از پر کاربردترین مصالح ساخت ‌و ‌ساز تبدیل گردد. با این حال، رفتار ترد بتن تحت بارهای خمشی از نقاط ضعف آن محسوب می‌شود. بنابراین، تحقیق حاضر به بررسی تاثیر الیاف‌های مختلف بر رفتار خمشی تیرهای بزرگ مقیاس می‌پردازد. به این منظور، چهار نمونه تیر بتن‌ مسلح با طول 150، عرض 20 و ارتفاع 30 سانتی‌متر با جزئیات آرماتورگذاری یکسان ساخته شد. تیرها با استفاده از سه نوع الیاف شامل الیاف‌های فولادی، پلی­پروپیلن و کورتا به اندازه 0/5 درصد حجم بتن مسلح شدند. آزمایش مقاومت خمشی بر اساس استاندارد ASTM C78 بر روی تیرها انجام و پارامترهای مقاومت خمشی، جذب انرژی، شکل­ پذیری و کرنش میلگردها مورد بررسی قرار گرفت. نتایج نشان داد که تیرهای حاوی الیاف فولادی در مقایسه با تیرهای حاوی الیاف‌های پلی­پروپیلن و کورتا از لحاظ پارامترهای مقاومت خمشی، جذب انرژی و ظرفیت میلگردهای کششی عملکرد بهتری را از خود نشان می‌دهند. علاوه بر این، نتایج نشان دهنده‌ی شکل‌پذیری مطلوب‌تر تیرهای مسلح شده به الیاف کورتا نسبت به تیرهای مسلح شده به الیاف پلی‌پروپیلن می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation and comparison of the influence of steel, polypropylene, and korta fibers in improving the flexural performance of reinforced concrete beams

نویسندگان [English]

  • Fereydoon Omidinasab 1
  • Abas Eskandari 1
  • Amirhosein Sahraei Moghadam 2
1 Civil, engineering, lorestan university, khorramabad, iran
2 Ph.D student, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده [English]

The advantages of reinforced concrete structures, in comparison with other structures, have made concrete one of the most widely used construction materials. However, concrete has brittle performance under flexural loads. Therefore, the present study investigates the influence of different fibers on the flexural performance of large-scale reinforced concrete beams. In order to achieve this goal, four reinforced concrete beams, with similar reinforcement details, measuring 150 cm long, 20 cm wide, and 30 cm high, were made. The beams were reinforced using 0.5% by volume of steel, polypropylene, and korta fibers. Based on ASTM C78, the four-point flexural test was performed and the parameters of flexural strength, energy absorption, ductility, and strain of the rebars were studied. The results indicated that reinforced concrete beam containing steel fibers shows better performance, in terms of flexural strength, energy absorption, and capacity of tensile rebars, in comparison with reinforced concrete beams containing polypropylene and korta fibers. In addition, this study showed that korta fiber reinforced beam has better ductility than polypropylene fiber reinforced beam.

کلیدواژه‌ها [English]

  • Steel fibers
  • Polypropylene fibers
  • Korta fibers
  • Flexural performance
  • Ductility

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 7
مهر 1401
صفحه 2779-2794

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