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Abstract
The current study investigated the effect of geogrid reinforcement on the fatigue behavior of concrete beam specimens in terms of the development of strains at the compressive zone. The concrete beam specimens having the dimensions of 150 mm × 150 mm × 550 mm were either unreinforced, reinforced with one layer of triaxial geogrid or reinforced with two layers of triaxial geogrid. The strains at the compressive zone of specimens were measured using strain gauges (SGs) fixed at two locations. The SGs of the first location were placed at the top of the specimens. The SGs of the second location were placed at 13 mm from the top of the specimens. The concrete beam specimens were tested under cyclic four-point bending loads with a frequency of 7 Hz. The cyclic four-point bending loads were carried out under a load control with a sinusoidal waveform for several stress levels. Test results indicated that triaxial geogrid reduced the average strains at the compressive zone by abou