Evaluation of Shear Resistance Mechanisms in Fiber-Reinforced RC Beams Using DIC

抄録

Shear loading tests were conducted on steel fiber-reinforced concrete (FRC) beams to clarify the effects of fiber volume fraction (v_f), shear reinforcement ratio (r_w), tensile reinforcement ratio (p_w), and shear-span ratio (a/d) on the shear resistance mechanism of steel FRC beams. The shear resistance carried by fibers was calculated through image analysis to obtain a detailed understanding of the opening and propagation of diagonal cracks, and its change with the fracture progression was quantified. The results showed that when shear reinforcement bars and steel fibers were used in combination, the shear resistance carried by fibers was maintained from the initiation of diagonal cracks to failure. In addition, the change in the shear resistance carried by fibers as the fracture progressed was similar to that of the beam action, regardless of the v_f, r_w, p_w, and a/d. This paper is an English translation of the authors’ previous work [Abe, K., Yanagida, R., Nakaya, S. & Igarashi S., (2023). Evaluation of shear mechanism of steel fiber reinforced RC beams using image correlations method. Proceedings of the Japan Concrete Institute, 45(2), 781-786. (in Japanese)].