Life cycle reliability assessment of reinforced concrete beams shear‐strengthened with carbon fiber reinforced polymer strips in accordance with fib bulletin 14

Abstract

The results of time‐variant reliability analysis of shear‐strengthened reinforced concrete (RC) beams with externally bonded fiber‐reinforced polymer (FRP) are presented with an emphasis on the effects of environmental harshness and effective design parameters. The effects of chloride‐induced pitting corrosion and FRP degradation are considered using Monte Carlo simulation to assess the influence of environmental deterioration on the fib 2001 limit states instead of applying design reduction factors. For the defined worked example, the proposed method specifies the remaining lifetime of the strengthened beam by considering a reasonable value for the target reliability index. With regard to the reliability index profiles, it is shown that chloride‐induced pitting corrosion has a greater effect on the shear capacity of strengthened beams than the degradation of the FRP. It was found that the FRP reinforcement ratio has a considerable effect on the governing failure mode; hence, it is important to calibrate the proposed safety verifications of fib bulletin 14 using sufficient experimental data for the relevant random variables in a reliability‐based context.

Interfacial properties of CFRP sheets and concrete subjected to variable amplitude fatigue loading

“…performance. [2][3][4][5] It has been demonstrated that flexural behavior or shear performance of concrete beams improves dramatically by externally bonded FRP at their bottom sides or lateral faces. One of their most typical failure modes is interfacial failure between FRP and concrete of beams, and bonding performance of FRPconcrete interface is an important factor to determine the reinforcement effect.…”

“…Fiber‐reinforced polymer (FRP) has increasingly become a mainstream in the areas of retrofit and rehabilitation for concrete structures mainly thanks to its material advantages of high strength to weight ratios, superior corrosion resistance, greatly improving structural ductility and flexibly applying on various shapes of concrete members 1 . At present, most studies on reinforced concrete (RC) beams strengthened with FRP have focused on their static performance 2–5 . It has been demonstrated that flexural behavior or shear performance of concrete beams improves dramatically by externally bonded FRP at their bottom sides or lateral faces.…”

Investigation of the Performance of Basalt Fiber Reinforced Asphalt Mixture

“…Guan et al found that brucite fiber could increase the strength and toughness of asphalt mixture. Meanwhile, the addition of fibers also can prevent the degradation of asphalt during transportation and construction [8][9][10]. C.Celauroet al [11] found the usability of basalt fibers in asphalt mixture has improved its resistance to permanent deformation.…”

Nonlinear finite element model for interface between anchoraged carbon fiber reinforced polymer and concrete surface

“…In the last decades, the using of carbon fiber reinforced polymer (CFRP) for strengthening and retrofitting of the existent structural member, and in enhancing the structural performance for the buildings during earthquakes considered to be a good solution in comparison to the other conventional strengthening methods like using steel. That attributed to the CFRP properties like its high strength, Low weight, ease of installation, corrosion resistance, flexibility to apply on any flat, curved, or geometrically irregular surfaces as well as its ability to improve the strength and ductility without adding stiffness to the elements . However, the premature failure resulted from the debonding of CFRP elements from concrete substrate prevents the CFRP from reaching its full strength.…”