Моделирование процессов в изгибаемых балках с дисперсным армированием при знакопеременных воздействиях

Abstract

The results of studies of the effect of dispersed reinforcement on the behavior of structures under static load of one sign or alternating static load under reinforcement with relatively long fibers are considered. The developed mathematical models and methods of experimental investigation of the behavior of beam elements with dispersed and combined reinforcement under alternating static effects, based on mathematical planning using a specially manufactured frame, are presented. The behavior of fibro-reinforced concrete and reinforced concrete beam elements under similar influences is compared. The results of experimental studies of cubes and prisms for static and compression are considered. The presented results of experimental studies allow us to conclude about the influence of dispersed reinforcement with relatively short fibers on the behavior of beam structures under alternating low-cycle static effects and the feasibility of combined reinforcement of structures operating under such influences. The results of the full-scale experiment are compared with the results of numerical modeling of processes in the studied structural elements. It is revealed that the use of dispersed reinforcement with relatively short fibers in combined reinforced beam structures operating under alternating influences will increase the crack resistance, and with a certain percentage of reinforcement, the strength of such structures. At the same time, the use of relatively short fibers will significantly reduce the complexity of manufacturing such structures.