Experimental Investigation Dowel Action of Longitudinal Reinforcement of Reinforced Concrete Beams

摘要

The technique and results of experimental investigation on test samples of shear force magnitude(dowel action)in longitudinal tensile reinforcement in the zone of transverse bending of reinforced concrete beams after the formation of inclined cracks are presented in the article.The design of test samples,the technique of measurement of deformations at carrying out tests is described.Deformations along the length of reinforcing bar were determined by means of chains of strain gauges pasted on the upper and lower faces of the reinforcing bar.According to the results of the study,the distribution of deformations along the length of reinforcing bars in the zone of transverse bending at different stages of loading is established.The experimental values of bending moments and shear forces in reinforcing bars after the formation of an inclined crack and in the failure stage were determined according to the readings of strain gauges.An analysis of the experimental data is performed and a comparison is made between the experimental values of the dowel action of the longitudinal reinforcement of reinforced concrete beams at the intersection of an inclined crack,depending on the percentage of longitudinal reinforcement of section.