Nonlinear Analysis of a Prestressed Beam Subjected to Shear Stress

Abstract Nonlinear finite element modelling is a standard tool for the extension of experimental research programs in the field of the design of concrete load-bearing structures. It allows for the expansion of the database of results obtained by a demanding experimental test in order to monitor quantities that could not be recorded during experiments and thus to formulate further conclusions from the research. The paper deals with an analysis of the shear stress of prestressed concrete beams with shear reinforcement. It is focused on investigating the effect of the magnitude of the axial force on the shear resistance. A beam with a height of 0.6 m and an I-shaped cross-section was analysed. A prestressed beam is used as a typical load-bearing element for the construction of road bridges. Two types of models were used: one considered the reinforcement as a discrete element and the second as a model with a smeared reinforcement. The modelling results confirmed only a small effect of the axial force on the increase in shear resistance.