نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، مهندسی عمران، گرایش مهندسی و مدیریت ساخت، گروه عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز.
2 استادیار دانشکدۀ فنی و مهندسی، گروه عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز
3 استادیار دانشکدۀ فنی و مهندسی، گروه عمران، واحد مراغه، دانشگاه آزاد اسلامی، مراغه.
4 دانشیار دانشکدۀ فنی و مهندسی، گروه عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز.
5 استادیار دانشکدۀ فنی و مهندسی، گروه عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز.
چکیده
در تحقیق حاضر با توسعه مدل المان محدود به بررسی رفتار بیرون کشیدگی میلگرد فولادی آجدار از بتن فوق‌توانمند الیافی پرداخته شد. مدل المان محدود چندمقیاسی به صورت سه فاز مجزا شامل بتن فوق‌توانمند به صورت ماده ایزوتروپ، میکروالیاف فولادی و میلگرد شبیه‌سازی شد. به منظور در نظر گرفتن فرضیات واقع‌بینانه‌تر، برای اولین بار آج‌های میلگرد نیز شبیه‌سازی شده و اندرکنش بین میلگرد و الیاف با بتن توسط مدل ناحیه تماس چسبنده اعمال شده است. پارامترهای مدل رفتاری ناحیه تماس چسبنده با کالیبره کردن نتایج مدل المان محدود و نتایج تست تجربی تعیین شد. در نهایت، پس از صحت‌سنجی نتایج المان محدود چندمقیاسی، بیشینه نیروی بیرون کشیدگی، جابجایی متناظر و کار انجام لازم برای بیرون کشیدگی میلگرد با استفاده از منحنی‌های نیرو-لغزش تعیین شد. عواملی نظیر درصد حجمی میکروالیاف فولادی، طول مهارشدگی و قطر میلگرد، بر مقاومت پیوستگی میلگرد و بتن فوق‌توانمند الیافی ارزیابی گردید. نتایج نشان می‌دهد که طول مهارشدگی تأثیر قابل ملاحظه‌ای بر رفتار پیوستگی میلگرد داشته و با افزایش طول مهارشدگی، نیروی بیرون کشیدگی نیز بیشتر می‌شود. با توجه به نتایج مشاهده می‌شود برای میلگرد با قطر 20 mm، با افزایش میزان الیاف از 0% به 2% نیروی بیرون کشیدگی و کار بیرون کشیدگی به ترتیب در حدود 30% و 22% افزایش می‌یابد.
کلیدواژه‌ها
عنوان مقاله [English]
Investigation of bonding behavior of steel ribbed rebar embedded in ultra-high performance concrete reinforced with steel microfiber using multi-scale finite element method
نویسندگان [English]
- Mohammad Reza Aghdami Sani 1
- Adel Ferdousi 2
- Masoud Pourbaba 3
- Yousef Zandi 4
- Seyed Saeed Mirrezaei 5
1 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
2 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
3 Department of Civil Engineering, Maragheh Branch, Islamic Azad University, Maragheh, Iran.
4 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
5 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
چکیده [English]
In this study, by developing the finite element model, the pull-out behavior of ribbed steel rebar from ultra-high performance fiber reinforced concrete was investigated. For this purpose, the multi-scale finite element model was simulated in three separate phases, including ultra-high performance concrete in the form of isotropic material, steel microfibers and ribbed rebar. In order to consider more realistic assumptions, Rib pattern of rebar were simulated for the first time and the interaction between concrete with rebar and fibers was modeled by using the adhesive contact zone model. The constant parameters of the adhesive contact zone model were determined by calibrating the results of the finite element model and those of the experimental pull-out test. Finally, after validating the multi-scale finite element results, the maximum pull-out force, the corresponding displacement and the work required for the rebar pull-out were determined using the force-slip curves. Effective parameters such as bond length and rebar diameter, and the volume percentage of steel microfibers, on the bond strength were evaluated. The results show that the bond length has a significant effect on the bonding behavior of the rebar and with increasing the bond length the pull-out force also increases. According to the results, for rebar with a diameter of 20 mm, by increasing the amount of fibers volume from 0 to 2%, the pull-out force and the work increase by about 30% and 22%, respectively.
کلیدواژه‌ها [English]
- Bond behavior
- Ultra high performance concrete
- Multi-scale finite element
- Steel microfibers
- Pull-out force
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