Experimental and analytical study of concrete behaviour under high strain-rates
The Hopkinson bar technique is considered to be the most suitable experimental technique to study material behaviour under uniaxial conditions. This technique is applied in association with LDTF apparatus for performing a series of experiments in order to study concrete dynamic behaviour under tension. Stress-strain diagrams, fracture parameters and crack propagation characteristics are investigated under different strain and strain-rate time-histories. In the theoretical part, a strain-rate dependent material model for concrete under monotomic dynamic loading, is also considered in order to represent the observed experimental behaviour. Experimental versus predicted values are compared for a series of parameters: tensile strength, corresponding strain, the ratio of dynamic strength to the strength of the static case, the ratio of corresponding strains, ultimate strain, dynamic modulus of elasticity, and so on. Based on the successful reproduction of the observed tensile concrete behaviour, the model was extended to describe the strain-rate effect for the compression case.
Bibliographic Reference: Paper presented: 12th Concrete Conference, Limmasol (CY), October 28-31, 1996
Availability: Available from (1) as Paper EL 40203 ORA
Record Number: 199611483 / Last updated on: 1997-01-16
Original language: el
Available languages: el