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The size effect of Muttoni et al.'s CSCT is shown to be very close andasymptotically identical to the energetic size effect law (SEL) extensivelyverified experimentally and theoretically (due to appear in the 2019 ACI Codefor both beam shear and punching). However, the CSCT derivation and calculationprocedure obfuscates the mechanics of failure. It is shown to rest on sixscientifically untenable hypotheses, which makes CSCT untrustworthy outside thetesting range. It would have to be taught to students as a dogma. Theseconclusions are supported by experimentally calibrated finite elementsimulations of crack path and width, stress distributions and localizationsduring failure, and strain energy release. The simulations also show the CSCTto be incompatible with the 'strut-and-tie' model modernized to include thesize effect in the compression strut. Finally, further deficiencies are pointedout for the Modified Compression Field Theory (MCFT), currently embedded in theModel Code.

Critique of Critical Shear Crack Theory (CSCT) for fib Model Code Articles on Shear Strength and Size Effect of RC Beams