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- W2203463092 abstract "In the Japanese Design Code for Concrete Reactor Vessels, design allowable concrete temperatures (normal operation: general area 65 °C, local area 90 °C) are specified. To evaluate the impact response of the reinforced concrete structure under high temperature conditions it is important to investigate the strain rate effect of concrete under such high temperature. Therefore, a series of static and dynamic tests at strain rates from 10 -6 /s to 10 1 /s with the concrete test specimen (water-cement ratios of 0.5and 0.6) were studied experimentally using a hydraulic loading system and a Split Hopkinson Pressure Bar (SHPB) type loading system. In the SHPB test system, 100 mm diameter bars were used taking account of the maximum aggregate size (20 mm) of the concrete, and a shock absorbing material was used to mitigate the Pochhammer-Chree effect due to the stress wave dispersion. The strain rate effect of the concrete was measured in terms of the initial elastic modulus, compressive strength and tensile strength at 20 °C, 65 °C and 90°C. Both initial elastic modulus and ultimate strength increase with strain rate, even in high temperature region. The slope of the regression curve of the normalized concrete strength (the ratio of dynamic strength to static strength) versus the log10 of the strain rate obtained in the high temperature test is less than the value obtained in saturated conditions at 20°C. Material tests at high temperature were conducted on partially dry concrete specimens. To determine the effects of moisture on concrete dynamic behavior, impact analysis was conducted in a compressive test with an FEM code, which is based on the two-phase media theory. It can be seen that the inertial pore water flow affects the dynamic stress-strain characteristics of the concrete under impact load." @default.
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- W2203463092 date "2000-06-29" @default.
- W2203463092 modified "2023-09-27" @default.
- W2203463092 title "Effect of strain rate on concrete strength under high temperature" @default.
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- W2203463092 doi "https://doi.org/10.2495/su000491" @default.
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