Deflections of slabs of monolithic flat ceilings with high-strength reinforcement without adhesion to concrete

The article deals with the effect of prestressed reinforcement without adhesion to concrete on the deflections of a slab of monolithic flat overlapping. One of the drawbacks that prevent the wide spread of beams, is the development of excessive deflections in the center of the slab. The aim of the study is to determine the level of influence of prestressed reinforcement without adhesion to concrete on the deflections of a slab of monolithic slabs, and also to compare the results on the deflection of plates with the contour and diagonal arrangement of the prestressed reinforcement. The shape of the rope is represented by the part of the parabola passing through the points of the rope support. On the support, the vertical and horizontal components of the reaction are determined by the longitudinal force in the rope and the exit angle of the rope. Plates of monolithic flat overlap 9x9m with diagonal and contour pre-stressed reinforcement were investigated. The influence of the arrangement of prestressed reinforcement on the deflections was evaluated in the Scad Office program. The deflection of the guy was simulated in the form of nodal forces, the number of which depends on the accepted grid, and the magnitude of the coordinate of the node point and the value of the resistance force on the support. According to the results of the study, the use of high-strength reinforcement without adhesion to concrete reduces the deflections in the center of the plate to 14.5% compared to the plate without prestressing. The difference in deflections in the center of the plate, with contour and diagonal ropes, is 16.33%. Analysis of the results allows a positive assessment of the use of high-strength reinforcement without adhesion to concrete to reduce the deflections of slabs without beams. (paper)