| Steel fiber reinforced concrete (SFRC) is a new compound material with excellent performance. Because the steel fiber holdbacks crack expanding, the tensile, impulsive and fracture strength of concrete are improved and the toughness is strengthened significantly. For its excellent performance, SFRC is widely used in the engineering. It is necessary to research the basic mechanical performance in order to use SFRC in practical engineering; therefore tests are conducted to characterize the stress-strain relationship of SFRC in compression. Based on the tests data, an analytical model is proposed to generate the complete stress-strain curve for SFRC. The temperature influence of compressive strength and tensile strength are studied. Based on the test results of SFRC under uniaxial compressive cyclic loads, the fatigue life and residual strain of SFRC in cold temperature are got and the fatigue characteristics of three stages of fatigue strain development are analyzed. Moreover fatigue damage evolution of SFRC in cold temperature under unaxial compressive cyclic loads is studied. At last, the distribution law of fatigue life of SFRC is analyzed and the S-N curve equation of SFRC in cold temperature under different probabilities of survival is given. Because the scatter of SFRC specimen is large, while the deformation law of SFRC is stable, the relationship between fatigue strain velocity εsec of linerdevelopment stage and fatigue life N is used to forecast the fatigue life of SFRC in cold temperature. |
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