Energy nonlinear damage creep model considering the influence of concrete creep rate

Lu Wang^*

• Liaodong University, Dandong, China

In order to study the influence of confining pressure on the deformation of concrete, the triaxial compression test and creep test of concrete under different confining pressures are carried out by combining laboratory test and theoretical analysis. Based on the whole creep process curve of concrete and the energy conservation theorem, the viscoplastic and accelerated creep models are established by introducing the loading rate equations at different stages. Taking time and stress as the triggering conditions of the creep model, the model parameters are identified by fitting the test curve, and a nonlinear creep damage model is established, which can better reflect the creep development characteristics of concrete. The results showed that the fitting curve and the test results are ideal. The newly established damage creep model can better describe the deformation characteristics of creep failure stage under different confining pressures and different stress levels. It can well describe the nonlinear creep development trend of concrete in the accelerated creep stage. In general, the creep model has a high degree of fitting for the damage description of concrete.