Cyclic Behaviour Of Plain Concrete Subjected ToMultidirectional Compression

The cyclic behaviour of plain cylindrical concrete subjected to multidirectional compression was investigated experimentally. A total of 42 cylindrical concrete specimens from three different concrete mixes were tested. This test program was particularly focused on the strength and deformation aspects of the concrete response and the process of damage build-up. From this study, it was found that the most important response index for concrete subjected to cyclic loading was the history of damage accumulated in the microstructure which was measured in terms of volumetric strain. The degradation of the elastic stiflhess due to cyclic loads was found to be primarily a function of geometrical change and insensitive to the type of concrete considered. The comparison with the monotonic response of concrete which was also investigated in this study suggests that the cyclic nature of the load promotes damage build-up at faster rates than the monotonic loading, and the path-dependence in the behaviour of concrete is primarily with respect to the deformations.