ABSTRACT
The signi—cance of this new conceptual change in the design of reinforced concrete structures can be best described by an observation made in 1984 by Professor MacGregor of Canada:
The strut-and-tie model (STM) is a logical extension of the truss model and the major difference between the two methods is that the STM is a set of forces in equilibrium but do not form a stable truss system. Thus, the STM is a generalization of the truss model. The truss model has been recognized in academia and practice to be the most reliable tool for the treatment of shear and torsion in structural concrete B-regions. The STM is currently recognized as the most reliable tool for the treatment of D-regions.
