Reliability analysis of shear strength provisions for FRP-reinforced concrete beams

Reliability-based assessment of bond strength models for near-surface mounted FRP bars and strips to concrete

“…Furthermore, the number of test data employed in each state of this study to evaluate the model uncertainty factor, ξm , is sufficient in terms of reliability aspects. In order to indicate the sufficiency of the number of data, the following approach is taken [12]. The mean of ξm is considered as a normally distributed random variable, of which the mean is the same as mean of ξm while the standard deviation, s, is equal to s = σ /n , where σ is the standard deviation of ξm , and n is the number of data.…”

“…In this way, φm proposed for the ACI, Seracino, and Zhang models is calculated between 0.25 to 0.36, 0.38 to 0.54, and 0.27 to 0.61, respectively, for the selected states and for βT =4.2 when the Canadian standard is considered (Table 7). It should be noted that similar approaches to solve the issue with fixed partial strength reduction factors have been selected by other researchers [12]. For the CSA standard, φm can easily be applied to the Pn equation and can be used in combination of φc and φf to provide a reasonable level of safety to the equations.…”

“…A particular complexity arises from the underpinning uncertainties that are associated with physical and mechanical characteristics of FRP composite [12,13,14,15,16,17]. The behaviour of the adhesive epoxy at the concrete/epoxy and epoxy/FRP interfaces should also be considered in the NSM FRP to concrete bond research studies.…”

Firefly Algorithm-Based Artificial Neural Network to Predict the Shear Strength in FRP-Reinforced Concrete Beams

“…However, FRPs sufer from a few shortcomings compared to steel, including a smaller modulus of elasticity, brittleness, and anisotropy. Recent research has focused on predicting the shear strength of FRP-reinforced concrete beams in addition to other aspects [5]. According to reports, the modulus of elasticity, shear span-to-depth ratio, beam width, concrete compressive strength, and fexural reinforcement ratio are the primary factors afecting the shear strength of FRP-reinforced concrete beams without stirrups [6].…”

“…Te design codes difer signifcantly in their choice of infuencing parameters on shear strength and their contributions. Researchers have assessed the shear provisions and concluded that they are exceedingly cautious or insufcient in some cases [5]. Tis overestimation results in an excess number of bars in the design, which causes reinforcing congestion and higher costs.…”