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- 주제어 : low-frequency cyclic loading (검색결과 2 건)
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가력속도 및 형상비 변화에 따른 철근콘크리트 원전 벽체의 구조성능
백장운,양현근,박홍근 한국콘크리트학회 2019 콘크리트학회논문집 Vol.31 No.3
In South Korea where high-frequency earthquake have recently occurred, reinforced concrete walls in nuclear power plants need to be re-investigated considering high strain rate caused by high-frequency earthquakes. In the present study, low-rise reinforced concrete walls were tested to investigate the effect of high loading rate. Identical twin specimens subjected to low and high loading rates were tested and the results were directly compared. The major test parameters were the loading rate, failure mode, aspect ratio, and reinforcement ratio. The test results showed that high loading rate did not change the major failure modes of walls. For all specimens that failed in flexure, shear, and shear sliding, the maximum strength was slightly increased by high loading rate. On the basis of the test results, the effect of loading rate on RC walls were reported.
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Creep properties and damage model for salt rock under low-frequency cyclic loading
Wang, Jun-Bao,Liu, Xin-Rong,Liu, Xiao-Jun,Huang, Ming Techno-Press 2014 Geomechanics & engineering Vol.7 No.5
Triaxial compression creep tests were performed on salt rock samples using cyclic confining pressure with a static axial pressure. The test results show that, up to a certain time, changes in the confining pressure have little influence on creep properties of salt rock, and the axial creep curve is smooth. After this point, the axial creep curve clearly fluctuates with the confining pressure, and is approximately a straight line both when the confining pressure decreases and when it increases within one cycle period. The slope of these lines differs: it is greater when the confining pressure decreases than when it increases. In accordance with rheology model theory, axial creep equations were deduced for Maxwell and Kelvin models under cyclic loading. These were combined to establish an axial creep equation for the Burgers model. We supposed that damage evolution follows an exponential law during creep process and replaced the apparent stress in creep equation for the Burgers model with the effective stress, the axial creep damage equation for the Burgers model was obtained. The model suitability was verified using creep test results for salt rock. The fitting curves are in excellent agreement with the test curves, so the proposed model can well reflect the creep behavior of salt rock under low-frequency cyclic loading. In particular, it reflects the fluctuations in creep deformation and creep rate as the confining pressure increasing and decreasing under different cycle periods.
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