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Effects of strain rate on concrete strength subjected to impact load - dynamic compressive strength test by Split Hopkinson Pressure Bar method
An impact test apparatus for concrete material was developed with both a hydraulic loading system and a Split Hopkinson Pressure Bar type loading system. In this apparatus, 100 mm diameter bars were used taking account of the maximum aggregate size of the concrete. A data processing method to distinguish an incident wave and a reflected wave was developed to obtain stresses at both ends of the test specimen accurately by strain gauges on the pressure bars near the specimen. A shock absorbing material was used to mitigate the Pochhammer-Chree effect due to the stress wave dispersion, so that the specimen was deformed uniformly, and the estimated stress distribution was acceptable during the loading time to deform the specimen completely. According to the test results, the strain rate effect on the compressive concrete strength from 10-3/sec to 102/sec was made clear. Moreover, the presence of moisture in the specimen was regarded as an important factor on the dynamic concrete strength.
Effects of strain rate on concrete strength subjected to impact load - dynamic compressive strength test by Split Hopkinson Pressure Bar method
An impact test apparatus for concrete material was developed with both a hydraulic loading system and a Split Hopkinson Pressure Bar type loading system. In this apparatus, 100 mm diameter bars were used taking account of the maximum aggregate size of the concrete. A data processing method to distinguish an incident wave and a reflected wave was developed to obtain stresses at both ends of the test specimen accurately by strain gauges on the pressure bars near the specimen. A shock absorbing material was used to mitigate the Pochhammer-Chree effect due to the stress wave dispersion, so that the specimen was deformed uniformly, and the estimated stress distribution was acceptable during the loading time to deform the specimen completely. According to the test results, the strain rate effect on the compressive concrete strength from 10-3/sec to 102/sec was made clear. Moreover, the presence of moisture in the specimen was regarded as an important factor on the dynamic concrete strength.
Effects of strain rate on concrete strength subjected to impact load - dynamic compressive strength test by Split Hopkinson Pressure Bar method
Jitsu, K. (author) / Shirai, K. (author) / Ito, C. (author) / Shimamura, K. (author) / Ohnuma, H. (author)
1998
10 Seiten, 6 Quellen
Conference paper
English
| British Library Conference Proceedings | 1998
Dynamic Brazilian test of concrete using split Hopkinson pressure bar
| Online Contents | 2016