Experimental Strengthening of Damaged and Un-Damaged RC Frames with Ultra-FRC Composite Layers

Document Type : Research Papers


1 Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran.

2 Semnan University


FRC concretes with high strength are practical material for strengthening existing particularly damaged concrete structures and able to dissipate seismic energy. The main purpose of this paper was to using high strength-FRC concrete for strengthening the damaged and undamaged frames. The five experimental specimens were loaded laterally and vertical gravity loads, simultaneously. The first specimen was a reference without strengthening, but the second same specimen was strengthened. The other three specimens were initially were loaded up to 55, 75, and 100% of the maximum capacity of the reference specimen and prepared as damaged specimens. The damaged specimens were laterally and vertically loaded. The test results showed that ductility of the undamaged strengthened frame was 2.2 times that of the reference specimen, while these amounts for three strengthened specimens (55, 75, and 100%) were up to 110, 60, 15 increase compared to the reference.  The maximum lateral capacity of second undamaged, third fourth, and fifth damaged specimens were 38 and 35, 16, 9% more than that of reference; while the significant increase of energy absorption from 1.28 to 2.37 times reference was observed.


Akbar, J., Ahmad, N. and Alam, B. (2019). “Seismic strengthening of deficient reinforced concrete frames using reinforced concrete haunch”, ACI Structural Journal, 116(1), 225-236.
Akbari, J. and Jafari, F. (2018).  “Calibration of load and resistance factors for reinforced concrete beams”, Civil Engineering Infrastructures Journal, 51(1), 217-227.
Akin, A. and  Sezer, R. (2016). “A study on strengthening of reinforced concrete frames using precast concrete panels”, KSCE Journal of Civil Engineering, 20, 2439-2446.
Canbolat, A. (2005). “Experimental study on seismic behavior of high performance fiber reinforced cement composite beams”, ACI Structural Journal, 102(1), 159-166.
Cao, M., Li, L. and Khan, M. (2018). “Effect of hybrid fibers, calcium carbonate whisker and coarse sand on mechanical properties of cement-based composites”, Materiales de Construction, 68 (330), e156.
Chanvillard, G. and Rigaud, S. (2003). “Complete characterization of tensile properties of ductal UHPFRC according to the French recommendations”, Proceedings of High Performance Fiber Reinforced Cement Composites (HPFRCC4), RILEM Publications, 21-34.
Choi, W.Cha., Yun, H.D., Cho, Ch.G. and Feo, L. (2014). “Attempts to apply high performance fiber-reinforced cement composite (HPFRCC) to infrastructures in South Korea”, Composite Structures, 109, 211-223.
Curbach, M. and Jesse, F. (1999). “High-performance textile-reinforced concrete”, Structural Engineering International, 9(4), 289-291.
Fischer, G., Wang, S. and Li, V.C.  (2003). “Design of engineered cementitious composites for processing and workability requirements”, Seventh International Symposium on Brittle Matrix Composites, Warsaw, Poland, pp. 29-36.
Hemmati, A., Kheyroddin, A. and Sharbatdar, M.K. (2015). “Plastic hinge rotation capacity of reinforced HPFRCC beam”, Journal of Structural Engineering, ASCE, 141(2), 04014111.
Hemmati, A., Kheyroddin, A., Sharbatdar, M.K., Park, Y. and Abolmaali, A. (2016). “Ductile behavior of high performance fiber reinforced cementitious composite (HPFRCC) frames”, Construction and Building Materials, 115(29), 681-689.
Hu, B., Wei, X., Lv, H., Kundu, T. and Li, N. (2019). “Experimental and analytical study on seismic behavior of strengthened existing single frame structures with exterior cantilevers”, Advances in Materials Science and Engineering, https://doi.org/10.1155/2019/3597480.
Krenchel, H. and Stang, H. (1989). “Stable microcracking in cementitious materials”, Brittle Matrix Composites, 2, 20-33.
Li, V. and Fischer, G. (2002a). “Effect of matrix ductility on deformation behavior of steel reinforced ECC flexural member under cyclic loading condition”, ACI Structural Journal, 99(6), 781-790.
Li, V.C. and Fischer, G. (2002b). “Influence of matrix ductility on tension stiffening behavior of steel reinforced ECC”, ACI Structural Journal, 99(6), 104-111.
Naaman, A.E. and Reinhardt, H.W.  (2003). “Setting the stage: Toward performance-based classification of FRC composites”, In: High Performance Fiber Reinforced Cement Composites (HPFRCC-4) 4th International RILEM Workshop, RILEM Publications.
Parra-Montesinos, G.J. (2005). “High-performance fiber-reinforced cement composites: An alternative for seismic design of structures”, ACI Structural Journal, 102(5), 668-675.
Peypolsazan Factory. (2015). Technical report, Mashad, Iran.
Poh-Yap, S., Johnson-Alengaram, U., Hung-Mo, K. and Zamin-Jumaat, M. (2017). “High strength oil palm shell concrete beams reinforced with steel fibres”, Materiales de Construction, 67(328), e142.
Reinhardt, H.W., Krüger, M. and Große, C.U. (2003). “Concrete prestressed with textile fabric”, Journal of Advanced Concrete Technology, 1(3), 231-239.
Shadafza, E. and Saleh Jalali, R. (2016). “The elastic modulus of Steel Fiber Reinforced Concrete (SFRC) with random distribution of aggregate and fiber”, Civil Engineering Infrastructures Journal, 49(1), 21-32.
Sharbatdar, M.K., Kheyroddin, A. and Emami, E. (2012). “Cyclic performance of retrofitted reinforced concrete beam–column joints using steel prop”, Construction and Building Materials 36(52), 287-294.
Verbruggen, S.,  Aggelis , D.G., Tysmans, T. and Wastiels, J. (2014). “Bending of beams externally reinforced with TRC and CFRP monitored by DIC and AE”, Composite Structures, 112(1), 113-121.