The development of methods for calculating structures made of ultra high-performance steel fiber-reinforced concrete (UHPC) in terms of strength and deformations is an important step towards the introduction of this innovative material into the practice of design and construction. This paper presents the results of finite element modeling of the operation of UHPC I-beam in the area of action of shear forces. The SMM model integrated in the OpenSees framework application is used for the walls of beams under conditions of flat stress. The authors have added new classes of materials that implement the averaged deformation laws of UHPC (with and without fiber) and the reinforcement placed in it. The calculations showed good convergence with the authors' own test results of the UHPC I-beams, as well as with the results of experiments by other researchers.
Keywords: shear strength, shear force, ultra high-performance steel fiber-reinforced concrete, I-shaped beams, OpenSees
Ultra high-performance or ultra high-strength concrete is a new class of cement-based materials with increased strength and durability. The widespread use of this concrete in construction practice requires theoretical and experimental studies of the stress-strain state of structures made from them. The article presents and analyzes the shear strength of I-shaped beams made of ultra-high-performance concrete tested by the authors. In the experiments, we varied the fiber content, the shear span, the shear reinforcement ratio, and the width of the compressed flange.
Keywords: shear strength, shear force, ultra high-performance steel fiber-reinforced concrete, I-shaped beams