Energy dissipation of ordinary concrete under discontinuous cyclic
compression tests and numerical simulations for the residual stress
Abstract
This paper presents an experimental investigation of ordinary concrete
under discontinuous cyclic compression tests and numerical simulations
for the residual stress. Stress cycles in discontinuous cyclic
compression tests were interrupted by zero or very low loading intervals
(ZLIs). Fatigue tests showed that the dissipated energy and the
unloading deformation modulus of a cycle after the ZLI ( A cycle)
were significantly larger than those of the cycle before the ZLI (
B cycle). The dissipated energy and the unloading deformation
modulus both increased with the increase of the stress level. The
mechanism of discontinuous fatigue results from the effect of the
residual stress which is caused by the uncoordinated mechanical
response. Simulations showed that stress concentration occurs on the
interface between the aggregate and the main material. The greater the
elasticity modulus difference between the aggregate and the main
material, the larger the residual stress and plastic deformation.