Publisher Summary This chapter examines the strut-and-tie model for the analysis of a reinforced concrete beam that contains geometric discontinuities in the form of a transverse circular opening in the web. Three full-size T-beams with circular openings, tested earlier, are chosen, and a strut-and-tie model is constructed for each beam. A comparison of the theoretical predictions concerning the ultimate strength, mode of failure, and the proportion of the applied shear carried by the chord members above and below the opening shows good agreement with test results. The chapter also successfully allows for an explanation for the modes of failure observed in the test and identifies the role of diagonal reinforcement provided by the side of an opening. These findings could lead to a better and more efficient design of the opening region of a beam in the future. The truss model also explains clearly the role of diagonal reinforcement in relieving the concrete distress at the throat section by transferring across the discontinuity a significant amount of applied shear.