ABSTRACT
Despite extensive experimental work has been carried out on shear in structural concrete, the shear design problem of structural concrete members has not been solved fully due to its complexity. The load transfer mechanism of a structural concrete member is not the function of a single variable and it depends on the geometry, loading and support conditions of the member. Empirical equations adopted in current concrete model codes lead to complex design procedures for shear and generally yield shear strength predictions, which deviate considerably from experimental results. In addition, empirical equations need to be continuously evaluated for new materials. Design procedures based on test results, rules of thumb, guess work and past experience have been one of the main reasons for the poor structural performance and failure of concrete structures. These highlight the limitations of empirical equations and the need for a rational approach to structural concrete.
