Evaluation of Shear Strength of SFRC Moderate Deep Beams Using Strut-and-Tie Models

Strut-and-tie is a system of forces' distribution in the form of "load-path" connectivity from the applied load point to the support point. Strut-and-Tie Method (STM) has been developed based on simple truss model. STM models represent the load carrying mechanism of a structural member by approximating the flow of internal forces by means of struts representing the flow of compressive stresses and ties representing the flow of tensile stresses. IS 456: 2000, along with other various codes of different countries, classifies the beam into three categories; namely normal beam, moderate deep beam, and deep beam, according to their span to depth ratios. The aim was to provide a systematic and comprehensive study on the shear strength of SFRC (Steel Fiber Reinforced Concrete) moderate deep beams without web reinforcement and to compare experimental result of shear strength with theoretical result by STM of SFRC. Experimental results of ultimate shear strength are compared with the theoretical results calculated from formula of STM given by various source such as ACI 318-08, Nielsen (1984), and Schlaich et al. (1987). We found that the experimental value and theoretical value by STM are within 15% variation range for all types of beam.