Study Of Fatigue And Damnification Of Layered Hybrid Fiber Reinforced Concrete

Fiber reinforced concrete has recently become one of a hot problem in the field of engineering, and layered steel fiber reinforced concrete(LSFRC) is a road structure of dual efforts on economy and performance. Few tests which Lu zhean professor etc have lead have proved that LSFRC holds fine capabilitys of bending, toughness, obstructing cract and fatigue. The text basing on these experimentations basically probes into the fatigue of both LSFRC and layered hybrid fiber reinforced concrete(LHFRC) in the same mix.The flexural experiments of twelve samples are studied to discuss influence of steel fiber types on flexural experiment. The curves of load-displacement are collected and their flexural strength and first-crack strength are analyzed. And toughness indexes of LSFRC are calculated in order to choose the best steel fiber by the JCI(Japanese Concrete Institute) method and the ASTM(American Society of Testing Materials) method.The fatigue performances of forty-four samples are studied. The trial gains the fatigue life under the different stress level, gathers circle stress-strain curves and full data of strain-fatigue life under fatigue load. And then the fatigue performance of LSFRC and LHFRC are described and analyzed quantificationally. By dealing with actual data of the fatigue life, Weibull's parameters of different stress level are gained. More, the fatigue lifes of different livabilitys are simulated through using Weibull and both single-logarithmic and double-logarithmic fatigue equations of different livabilitys are regressed to offer theory evidence for actual engineering.Finally, to get their damnification evolvement rule, in the paper data of circle-loading stress-strain are deal with and both LSFRC's and LHFRC's damnification performance are studied...