| Fatigue Behavior of Plain Concrete Under Biaxial Compression: Experiments and Theoretical Model |
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| 作者姓名： | ZHU Jin-song |
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| 作者单位： | State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 116024，China，State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 116024，China，State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 116024，China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China(Grant No.50078010) |
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| 摘 要： | The effects of different lateral confinement stress on the fatigue behavior of and cumulative damage to plain concrete are investigated experimentally. Eighty 100 mm x 100 mm x 100 mm specimens of ordinary strength concrete are tested under constant- or variable-amplitude fatigue loading and lateral confinement pressure in two orthogonal directions. A fatigue equation is developed by modifying the classical Aas-Jakobsen S-N equation for taking into account the effect of the confined stress on fatigue strength of plain concrete. The results of variable-amplitude fatigue tests indicate that the linear damage theory proposed by Palmgren and Miner is unreasonable in the biaxial stress state. A nonlinear cumulative damage model that could model the effects of the magnitude and sequence of variable-amplitude fatigue loading and lateral confinement pressure is proposed on the basis of the evolution laws of the residual strains in the longitudinal direction during fatigue tests. The residual fatigue life predic
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Fatigue Behavior of Plain Concrete Under Biaxial Compression:Experiments and Theoretical Model |
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| ZHU Jin-song,SONG Yu-pu and CAO Wei
State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian ,China.Fatigue Behavior of Plain Concrete Under Biaxial Compression: Experiments and Theoretical Model[J].China Ocean Engineering,2003,17(4):617-630. |
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| Authors: | ZHU Jin-song SONG Yu-pu and CAO Wei
State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian China |
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| Affiliation: | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian,116024, China State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian,116024, China State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian,116024, China |
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| Abstract: | The effects of different lateral confinement stress on the fatigue behavior of and cumulative damage to plain concrete are investigated experimentally. Eighty 100 mm x 100 mm x 100 mm specimens of ordinary strength concrete are tested under constant- or variable-amplitude fatigue loading and lateral confinement pressure in two orthogonal directions. A fatigue equation is developed by modifying the classical Aas-Jakobsen S-N equation for taking into account the effect of the confined stress on fatigue strength of plain concrete. The results of variable-amplitude fatigue tests indicate that the linear damage theory proposed by Palmgren and Miner is unreasonable in the biaxial stress state. A nonlinear cumulative damage model that could model the effects of the magnitude and sequence of variable-amplitude fatigue loading and lateral confinement pressure is proposed on the basis of the evolution laws of the residual strains in the longitudinal direction during fatigue tests. The residual fatigue life predicted by this model is found to be in good agreement with the results of the experimental research. |
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| Keywords: | concrete variable-amplitude fatigue strength biaxial compression invariable lateral confinement cumulative damage life prediction |
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