بررسی آزمایشگاهی تاثیر استفاده از الیاف فولادی بر رفتار خمشی تیرهای بتنی پیش‌تنیده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آیت الله بروجردی، بروجرد، ایران

2 دانشیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بوعلی سینا، همدان، ایران.

10.22124/jcr.2025.30262.1698

چکیده

بتن مورد استفاده در اعضای پیش‌تنیده دارای مقاومت بالاتری نسبت به بتن مصرفی در سازه‌های بتن‌آرمه معمولی است و بتن‌های با مقاومت بالا از رفتار مقداری متفاوت در مقایسه با بتن‌های معمولی برخوردار می‌باشند. با افزایش مقاومت، شکل‌پذیری بتن کمتر و حالت شکنندگی در آن بیشتر می‌شود. یک گام مهم در جهت غلبه بر این مشکل، استفاده از الیاف در طرح مخلوط بتن است. هدف از انجام این پژوهش،‌ استفاده از الیاف در طرح مخلوط بتن مصرفی در ساخت نمونه‌های پیش‌تنیده و انجام مجموعه‌ای از آزمایش‌ها، به‌منظور بررسی اثر الیاف مورد استفاده بر ظرفیت باربری و عملکرد سازه‌ای نمونه‌های پیش‌تنیده مورد مطالعه است. برای این منظور 3 نمونه تیر بتنی به‌صورت پیش-تنیده‌ی پیش‌کشیده با ابعاد مفروض در آزمایشگاه سازه ساخته شد. الیاف مورد استفاده از نوع الیاف فولادی با بدنه موج‌دار و دوانتها قلاب می‌باشد. نمونه‌ها جهت بررسی تحت آزمایش بارگذاری خمشی به‌روش چهارنقطه‌ای قرار گرفتند و پارامترهای ظرفیت باربری، جذب انرژی، سختی موثر، شکل‌پذیری و خیز وسط دهانه مورد بررسی قرار گرفت. نتایج نشان می‌دهد که اضافه نمودن الیاف فولادی به مخلوط بتن باعث افرایش مقاومت فشاری و کششی بتن گردید و با افزایش درصد حجمی این نوع الیاف، مقاومت‌های فشاری و کششی نیز افزایش پیدا کردند. همچنین پارامترهای مورد نظر جهت بررسی رفتار خمشی تیرهای مورد مطالعه با اضافه نمودن الیاف فولادی به مخلوط بتن افزایش می‌یابند و این افزایش با افزایش درصد حجمی الیاف استفاده شده در مخلوط بتن رابطه مستقیم دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation of the effect of using steel fibers on the flexural behavior of prestressed concrete beams

نویسندگان [English]

  • pouya hassanvand 1
  • Freydoon Rezaie 2
1 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran
2 Associate Professor, Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
چکیده [English]

The concrete used in prestressed members has higher strength than the concrete used in conventional reinforced concrete structures, and high-strength concretes have somewhat different behavior compared to conventional concretes. As the strength increases, the ductility of the concrete decreases and its brittleness increases. An important step towards overcoming this problem is the use of fibers in the concrete mix design. The purpose of this research is to use fibers in the concrete mix design used in the construction of prestressed specimens and to conduct a series of experiments to investigate the effect of the fibers used on the load-bearing capacity and structural performance of the prestressed specimens under study. For this purpose, 3 concrete beam specimens were fabricated in a prestressed form with given dimensions in the structural laboratory. The fibers used are steel fibers with a corrugated body and hook ends. The specimens were subjected to a four-point bending loading test for examination and the parameters of load-bearing capacity, energy absorption, effective stiffness, ductility and mid-span deflection were investigated. The results show that adding steel fibers to the concrete mix increased the compressive and tensile strengths of concrete and by increasing the volume percentage of this type of fiber, the compressive and tensile strengths also increased. Also, the parameters considered for investigating the bending behavior of the studied beams increase by adding steel fibers to the concrete mixture, and this increase is directly related to the increase in the volume percentage of fibers used in the concrete mixture.

کلیدواژه‌ها [English]

  • Concrete beam
  • prestressing
  • fiber concrete
  • steel fibers
  • flexural behavior
  • load-bearing capacity

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