Numerical Evaluation of Shear Strength Degradation Mechanism Dependent on the Size Increase of RC Deep Beams with Height up to 1.5 Meter by Using 3D Rigid-Body-Spring-Method

The purpose of this paper is to clarify the mechanism shear strength reduction for reinforced concrete deep beams with varying stirrup ratios, due beam size increase. Three Dimensional Rigid-Body-Spring-Method was applied numerical tool. By using simulation results effective depth smaller than 1500 mm, dependence each resistance component such as arch, and truss actions were investigated, along localized information crack pattern, diagonal width compressive stress. It revealed that effect on from arch action, change ratio does not show any inhibiting effects it. crucial reason action resultant cross sections, critical width, which increases size, a key factor deterioration capacity stress in struts. Moreover, it found only affects normalized strength, but also has influence post-peak behavior beam.