Endochronic damage constitutive model for fully-graded aggregate mass concrete

摘要

The behavior of deformation and strength of a fully-graded aggregate concrete under complex stress state is the basis of the nonlinear analysis and design for mass concrete structures such as concrete dams.In this paper,based on the combined endochronic theory with damage mechanics and on the quantities of experimental data,an endochronic damage constitutive model suitable for various aggregate grade concrete is proposed.This model takes into consideration the scale effect and the effect of wet screen sieve of aggregate in which the concept of yield surface is not needed and the difference of damage evolution rule of various graded aggregate concrete is a concern.The proposed model is used to analyze the deformation and strength of fully-graded aggregate mass concrete and the wet screened aggregate concrete specimens.The calculated results are in good agreement with experimental data,which can be used as a guide for the design of arch dams and other mass concrete structures.