Dynamic compressive properties of concrete under biaxial equal proportion loading

To investigate the dynamic compressive properties of concrete under multi-axial stress states and different stress paths,the dynamic compressive test was carried out on concrete specimens under biaxial equal proportion loading condition using a large static-dynamic electro-hydraulic servo test system.The biaxial loading ratios were 1∶0,1∶0.5 and 1∶1,while the strain rates were 10-5/s,10-4/s,10-3/s and 102/s respectively.In this test,the compressive strength,elastic modulus, peak strain and stress-strain curve of concrete were studied at different strain rates and various stress ratios.The experimental results indicate that both compressive strength and elastic modulus of concrete at different stress ratios increase with increasing the strain rate.Comparing with the uniaxial dynamic compression,the increase in compressive strength at the stress ratio of 1∶0.5 is the largest at the same strain rate.