All researchers that have tested the shear capacity of RC members without stirrups have observed a large scatter in the results.
The objective of this paper is to conduct an overview study of the causes to the great shear failure scatter of RC beams without stirrups. Thirteen groups of shear tests on comparable experiments, extracted from the ACI-DAfStb evaluation database, are considered. The amount of data available is increased numerically. To this end, based on Eurocode 2 equations for shear resistance and shrinkage strain, a full probabilistic model according to JCSS Probabilistic Model Code is defined. A multivariate statistical evaluation of outcomes is then performed.
The investigation highlights that both tensile strength of concrete and high values of shrinkage may be useful to be considered for more in-depth studies of the phenomenon, whereas geometrical properties and concrete compressive strength seem to be less important or can even be neglected.