Author(s)

Ansheng Wu ¹, Yanwei Hou ²

Affiliation(s)

¹ School of Road and Bridge & Architectural Engineering, Shaanxi Railway Institute, Weinan, 714000, China
² School of Art, Shangqiu University, Shangqiu, 476000, China

Corresponding Author

Ansheng Wu

ABSTRACT

In order to study the variation law of flexural capacity reliability of reinforced concrete (RC) beams exposed to high temperature, a calculation method for flexural capacity of RC beams after fire was proposed based on the improved section method. The mechanical properties of post-fire RC beams were tested. The temperature field distribution of RC beams after fire was numerically simulated and verified by ABAQUS, and the reliability analysis of post-fire RC beams strengthened with Carbon Fiber Reinforced Polymer (CFRP) was carried out by Monte Carlo method. The calculation results show that with the increase of load ratio and fire time, the reliability of the flexural capacity of RC beams after fire decreases obviously, but with the increase of the number of layers of CFRP sheets, the reliability of the flexural capacity of RC beams after fire increases obviously, and the reliability improvement effect is most significant when two layers CFRP sheets are reinforced. The analysis results can provide a reference for the subsequent research on mechanical properties of post-fire reinforced concrete structures reinforced by CFRP.

KEYWORDS

Reinforced concrete, CFRP, Post-fire, Monte Carlo method, Reliability

CITE THIS PAPER

Ansheng Wu, Yanwei Hou, Reliability Analysis of Post-fire RC Beams Strengthened with CFRP. Journal of Civil Engineering and Urban Planning (2023) Vol. 5: 71-87. DOI: http://dx.doi.org/10.23977/jceup.2023.050409.

REFERENCES

[1] Thomaz E. T. B. Analytical and numerical analyses of RC beams exposed to fire adopting a LITS trilinear constitutive law for concrete. Case Studies in Construction Materials. 2022, 17, e01619. https://doi.org/10.1016 / j. c s c m. 2022.e01619.
[2] Roy T., Matsagar, V. A probabilistic framework for assessment of RC wall panel under cascaded post blast fire scenario. Journal of Building Engineering. 2022, 45, 103506. https://doi.org / 10.1016/j. job e. 2021.103506.
[3] Melo, J., Zafiris, T., David, R., et al. Cyclic behavior of as built and strengthened existing RC columns previously damaged by fire. Engineering Structures. 2022, 266, 114584. https://doi.org/10.1016/j.engstruct. 2 022.114584.
[4] XU YY, WU, B., WAN, R. H. Experimental study on residual performance of RC beam s after fire. Journal of Building Structure s. 2013, 34, 20-29. doi:10.14006/j.jzjgxb.2013.08.004. 
[5] LI, Y. Z., TANG, Y. J., XU, Z. S. Experimental Study on Bearing Capacity and Reliability Analysis of Reinforced Concrete Simple Support Beam after Fire Damage. China Safety Science Journal. 2004, 10, 88-92+3. DOI:10.16265/j.cnki.issn1003-3033.2004.10.020.
[6] Yaroslav, B., Jacek, S., Rostyslav, V., et al. Strengthening Reinforced Concrete eccentrically loaded columns by CFRP at different levels of initial load. Engineering Structures. 2023, 280, 115694. https://doi. org/10.1016/j.eng struct.2023.115694.
[7] Azeedo, A.S., Frmo, J.P., Coreia, J.R., et al. Fire behaviour of C F R P strengthened Reinforced Concrete slabs using different techniques-EBR, NSM and Create. Composites Part B: Engineering. 2022, 230, 109471. https://doi.org/10.1016/j. composite sb. 2021.109471.
[8] Muazzam, G. S., Muhammad, W., Nasser, A. N., et al. Behavior of artificially corroded reinforced Concrete beams strengthened with CFRP and hybrid CFRP-GFRP laminates. Engineering Structures. 2016, 272, 114827. https://doi.org/10.1016/j. engstruct. 2022.114827. 
[9] Zhu, C. Q., Zhang, D. B., Zhu, H. Y. Reliability Analysis on Bolt Support Structure of Coal Roadway Based on Monte-Carlo. China Safety Science Journal. 2008, 04, 146-150. DOI:10.16265/j.cnki.issn1003-3033.2008.04.003.
[10] European Committee for Standardization, ENV 1994-1-2, Eurocode 4, Design of Composite and Concrete Structures, part1.2: Structural Fire Design, 1994.
[11] Lie, T. T., De ham, E. M. A. Factors affecting the fire resistance of circular hollow steel columns filled with bar RC. N R C- C NRC Internal Report. 1993, 651, 103506.
[12] European Committe for Standardization, ENV 1993-1- 2, Eurocode 3, Design of Steel Structures, part1.2: Structural Fire Design, 1993.
[13] Lie, T. T., Irwn, R. J. Fire resistance of rectangular steel columns filled with reinforced Concrete. Journal of Structural Engineering.1995, 121(5) : 797-805
[14] Lu, Z. D., Chai, L. F., Yu, J. E. Calculation and analysis of mechanical properties of reinforced concrete continuous beam after fire. Journal of Tongji University (Natural Science). 2015, 43, 16-26. https:// k ns.cnki.net/ k cms/ detail/ 10.11908/ j. is sn. 0253-374x. 2015.01. 003. html
[15] Gernay, T., Milard, A., Fransen, J. M. A Multiaxial Constitutive Model for RC in the Fire Situation: Theoretical Formulation. International Journal of Solids and Structures. 2013, 50, 3659-3673. https:// doi.org/10.10 16 /j.ijsolstr. 2013.07.013.
[16] Ministry of Houing and Urban-Rural Construction of the People's Republic of China. Unified Standard for Reliability Design of Engineering Structures (G B 50153-2008). Beijing: China Architecture and Building Press, 2008.
[17] Roy, T., Vasant, M. Evaluation of rebar mechanical properties after high temp (Fire Exposure). Sichuan Building Science. 1991, 02, 05-09.

Sponsors, Associates, and Links

---

• Journal of Sustainable Development and Green Buildings
  
  
• Landscape and Urban Horticulture
  
  
• Bridge and Structural Engineering
  
  
• Soil Mechanics and Geotechnical Engineering
  
  
• Journal of Municipal Engineering
  
  
• Heating, Ventilation and Air Conditioning
  
  
• Indoor Air Quality and Climate
  
  
• Computer Aided Architecture Design