Experimental study on tension-compression alternation of fully-graded concrete under cyclic loading

Considering the reciprocating effect of seismic load and the initial compressive stress level of high arch dam, a feasible test procedure is designed by using the 15MN large dynamic material testing machine and special connection devices. The tension-compression alternating test of fully-graded concrete specimens under cyclic loading of about 5MPa compressive stress level is carried out. By means of the VIC-3D non-contact full-field strain measurement system and high-precision axial extensometer, a complete tension-compression alternating stress-strain curve of fully-graded concrete under 5 MPa compressive stress level is obtained. Based on that the tension-compression damage evolution law for this whole process of fully-graded concrete is summarized, which provides data support for studying the damage evolution of arch dams under reciprocating seismic loads. (paper)