Reexamination of shear design provisions for high-strength longitudinally RC beams

Abstract

Lack of information regarding the shear behavior of high-strength longitudinally reinforced concrete beams without shear reinforcement (HRCBW) impedes the design engineers from using the full yield strength of material. Current shear design provisions for HRCBW were reexamined based on probability density function, confidence interval and confidence level. Based on the principal shear mechanism of beam and arch actions, a probabilistic shear capacity model for HRCBW was proposed based on the Bayesian theory and the Markov Chain Monte Carlo (MCMC) method taking into account both aleatory and epistemic uncertainties. Meanwhile, statistical characteristics (e.g. mean value, standard deviation, distribution type) of shear capacity for HRCBW were determined by Kolmogorov-Smirnov (K-S) test and statistical analysis. Moreover, the accuracy and applicability of three major shear design provisions (i.e. ACI 318-19, EC 2, fib MC2010) for HRCBW were reexamined based on probability density function, confidence interval and confidence level.