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Experimental tests show that static pre-loading has a significant effect on the dynamic strength of concrete.Based on meso-scale particle element model,numerical simulations of dynamic bending tests with pre-loading are performed.Complete stress–strain relationships are then obtained.Significant increase in dynamic strength is found when the pre-loadings are imposed within the elastic limit of concrete.However,when the imposition of pre-loadings reaches the plastic or softening range,dynamic strengths may gradually decrease along with the increase in pre-loadings.The distribution of energy components and the failure modes are discussed to explain the mechanisms of the phenomena.
Experimental tests show that static pre-loading has a significant effect on the dynamic strength of concrete. Based on meso-scale particle element model, numerical simulations of dynamic bending tests with pre-loading are performed. Complete stress-strain relationships are then obtained. Significant increase in dynamic strength is found when the pre-loadings are imposed within the elastic limit of concrete. However, when the imposition of pre-loadings reaches the plastic or softening range, dynamic strengths may gradually decrease along with the increase in pre-loadings The distribution of energy components and the failure modes are discussed to explain the mechanisms of the phenomena.