ارزیابی عملکرد ورق‌های پلیمر فیبر کربنی CFRP در مقاوم‌سازی اتصال دال-ستون بتنی مسلح RC

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، واحدمهاباد، دانشگاه آزاد اسلامی، مهاباد، ایران.

10.22124/jcr.2024.24287.1619

چکیده

در دال‌های بتنی تخت به دلیل عدم وجود تیرهای نگهدارنده، تنش‌های برشی سه بعدی در اطراف ناحیه اتصال دال-ستون ایجاد می‌گردد که منجر به ترک برشی شعاعی و در نهایت شکست پانچ در ناحیه اتصال ستون به دال می‌شود. در این مقاله به هدف ارزیابی مقاوم‌سازی اتصال ستون به دال بتنی تخت مسلح با بهره‌گیری از ورق‌های CFRP تحت شرایط بارگذاری برش پانچ و بارگذاری لرزه‌ای مطالعات پارامتریکی به روش عددی انجام شده‌است. براین اساس با در نظر گرفتن 5 متغییر: شرایط بارگذاری، تعداد لایه‌های فیبر در ورق، زاویه قرارگیری الیاف، ضخامت ورق و ابعاد ورق‌های CFRP، مطالعات در بستر نرم‌افزار المان محدود آباکوس و در قالب 33 مدل مجزا انجام شده‌است. صحت‌سنجی مدل عددی بر اساس مدلسازی نمونه آزمایشگاهی مورد ارزیابی قرار گرفت. نتایج نشان داد که میانگین خطای مدلسازی عددی 5.2% نسبت به نمونه آزمایشگاهی بوده که نشان دهنده دقت قابل قبول مدل عددی می‌باشد. نتایج نشان داد که دو پارامتر ضخامت و ابعاد ورق به عنوان اصلیترین پارامتر در مقاوم‌سازی اتصال دال-ستون RC بوده، به گونه‌ای که با در نظر گرفتن مقادیر بهینه هریک از دو پارامتر میزان آسیب در دال بتنی حدودا تا 98% کاهش می‌یابد. نتایج حاصل از این پژوهش می‌تواند به عنوان یک مدل جامع برای طراحی و به کارگیری ورق های CFRP در مقاوم‌سازی اتصال ستون-دال بتنی تخت مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Performance Evaluation of CFRP Sheets in Reinforcing RC Slab-Column Connection

نویسندگان [English]

  • zana kohneposhi
  • Hadi Azizian
  • Omid Haddad
  • Seyed Jamil Ghaderi
Department of Civil Engineering, Mahabad Branch, Islamic Azad University, Mahabad, Iran.
چکیده [English]

In concrete slabs, due to the absence of support beams, three-dimensional shear stresses are created around the slab-column connection area, leading to radial shear cracks and punching shear in the column-slab connection area. In this article, for evaluating the strengthening of the slab-column connection using CFRP sheets under the conditions of punching shear and seismic loading, the numerical method has carried parametric studies out. Therefore, considering 5 variables: loading conditions, number of fiber layers in the sheet, angle of fiber placement, sheet thickness, and dimensions of CFRP sheets, parametric studies have been carried out in the form of 33 separate models by Abaqus finite element software. Validation of the numerical model was evaluated based on the modeling of the laboratory sample. The results showed that the average error of numerical modeling was 5.2% compared to the laboratory sample, indicating the numerical model's acceptable accuracy. Also, the results showed that the two parameters of sheet thickness and dimensions are the main parameters in strengthening the RC slab-column connection, so considering the optimal values of about 98% reduces the damage to the concrete slab. The results of this research can be used as a comprehensive model for the design and application of CFRP sheets in strengthening the concrete column-slab connection.

کلیدواژه‌ها [English]

  • concrete slab
  • RC slab-column
  • carbon fiber polymer
  • CFRP
  • punching shear
  • seismic loading

مراجع

  1. Al-Maliki, H. N., Al-Balhawi, A., & Ali, A. M. (2021). Punching Shear Resistance of Reinforced Concrete Flat Slabs Strengthened by CFRP and GFRP: A Review of Literature. Engineering and Technology Journal, 39(8), 1281-1290.
  2. Abdulrahman, B. Q., & Aziz, O. Q. (2021). Strengthening RC flat slab-column connections with FRP composites: A review and comparative study. Journal of King Saud University-Engineering Sciences, 33(7), 471-481.
  3. Al-Rousan, R. Z., Alhassan, M. A., & Al-omary, R. J. (2021). Response of interior beam-column connections integrated with various schemes of CFRP composites. Case Studies in Construction Materials, 14, e00488.
  4. Camata, G., Spacone, E., & Zarnic, R. (2007). Experimental and nonlinear finite element studies of RC beams strengthened with FRP plates. Composites Part B: Engineering, 38(2), 277-288.
  5. EL-Mandouh, M. A., Hu, J. W., & Abd El-Maula, A. S. (2022). Seismic behavior of RC slab-column connection with openings strengthened with CFRP. Case Studies in Construction Materials, 17, e01517.
  6. Akhundzada, H., Donchev, T., & Petkova, D. (2019). Strengthening of slab-column connection against punching shear failure with CFRP laminates. Composite Structures, 208, 656-664.
  7. Anil, Ö., Kaya, N., & Arslan, O. (2013). Strengthening of one way RC slab with opening using CFRP strips. Construction and Building Materials, 48, 883-893.
  8. Salman, W. D., Murtada, A. I., & Qusay, W. A. (2015). Strengthening of reinforced concrete one-way slabs using CFRP in flexural. J Eng Sci Res Technol, 4(8), 2277-9655.
  9. A. Al-Kannoon, H.W. Ali, Strengthening of reinforced concrete solid slabs with CFRP products, Int. J. Sci. Eng. Res. 7 (9) (2016) 1237–1243.
  10. Moon, J., Reda Taha, M. M., & Kim, J. J. (2017). Flexural strengthening of RC slabs using a hybrid FRP-UHPC system including shear connector. Advances in Materials Science and Engineering, 2017.
  11. Moshiri, N., Czaderski, C., Mostofinejad, D., Hosseini, A., Sanginabadi, K., Breveglieri, M., & Motavalli, M. (2020). Flexural strengthening of RC slabs with nonprestressed and prestressed CFRP strips using EBROG method. Composites Part B: Engineering, 201, 108359.
  12. Aman, S. S., S. Mohammed, B., Wahab, M. A., & Anwar, A. (2020). Performance of reinforced concrete slab with opening strengthened using CFRP. Fibers, 8(4), 25.
  13. Azizian, H., Lotfollahi-Yaghin, M. A., & Behravesh, A. (2021). Punching Shear Strength of Voided Slabs on the Elastic Bases. Iranian Journal of Science and Technology, Transactions of Civil Engineering, 45, 2437-2449.
  14. Kotynia, R., Walendziak, R., Stoecklin, I., & Meier, U. (2011). RC slabs strengthened with prestressed and gradually anchored CFRP strips under monotonic and cyclic loading. Journal of Composites for Construction, 15(2), 168-180.
  15. Daud, R. A., Cunningham, L. S., & Wang, Y. C. (2015). Static and fatigue behaviour of the bond interface between concrete and externally bonded CFRP in single shear. Engineering Structures, 97, 54-67.
  16. Daud, R. A. (2015). Behaviour of reinforced concrete slabs strengthened externally with two-way FRP sheets subjected to cyclic loads. The University of Manchester (United Kingdom).
  17. Liu, H., Wang, Z., Du, X., & Shen, G. Q. (2021). The seismic behaviour of precast concrete interior joints with different connection methods in assembled monolithic subway station. Engineering Structures, 232, 111799.
  18. Cai, Z. W., Liu, X., Li, L. Z., Lu, Z. D., & Chen, Y. (2021). Seismic performance of RC beam-column-slab joints strengthened with steel haunch system. Journal of Building Engineering, 44, 103250.
  19. Khaleel, G. I., Kareem, A. H. A., Debaiky, A. S., & Abd Elmaogod, E. G. (2022). Punching strengthening of reinforced concrete slab-Column connection using different techniques. International Journal of Advanced Engineering, Management and Science, 8, 2.
  20. Houda, A., Benbouras, M. A., Zedira, H., Redjel, B., & Lefilef, L. (2022). the influence of spacing between cfrp strips on the strengthened concrete slabs'behavior.  Architecture. Constructions/Urbanism. Arhitectura. Constructii, 13(1).
  21. Mercimek, Ö., Ghoroubi, R., Erbaş, Y., & Anil, Ö. (2022, December). Comparison of strengthening methods to improve punching behavior of two-way RC flat slabs. In Structures(Vol. 46, pp. 1495-1516). Elsevier.
  22. Dat, P. X., & Hieu, N. T. (2023). Experimental study on the effectiveness of strengthening reinforced concrete slab-column connections using CFRP sheets. Journal of Science and Technology in Civil Engineering (JSTCE)-HUCE, 17(3), 46-54.
  23. Ghayeb, H. H., Atea, R. S., Al-Kannoon, M. A. A., Lee, F. W., Wong, L. S., & Mo, K. H. (2023). Performance of reinforced concrete flat slab strengthened with CFRP for punching shear. Case Studies in Construction Materials, 18, e01801.
  24. Türer, A., Mercimek, Ö., Anıl, Ö., & Erbaş, Y. (2023, March). Experimental and numerical investigation of punching behavior of two-way RC slab with different opening locations and sizes strengthened with CFRP strip. In Structures(Vol. 49, pp. 918-942). Elsevier.
  25. Fareed, S., & Khan, A. U. R. (2023). Behavior of reinforced recycled aggregate concrete beams and slabs strengthened in flexure and punching with CFRP composites. The Journal of The Textile Institute, 1-9.
  26. Hamoda, A., & Hossain, K. M. A. (2019). Numerical assessment of slab–column connection additionally reinforced with steel and CFRP bars. Arabian Journal for Science and Engineering, 44, 8181-8204.
  27. Golestani, M., Alam, M. S., & Calvi, G. M. (2023). A performance‐based seismic loading protocol: The generated sequential ground motion.Earthquake Engineering & Structural Dynamics, 52(7), 2196-2221.

فایل ها

هم رسانی

ارجاع به این مقاله

آمار