Study On Fatigue Behavior Of Resin Concrete Based On Residual Strength Theory

In order to study the mechanical properties and fatigue damage performance of resin concrete, the component material of resin concrete influence on the mechanical properties were obtained through mechanical study under the different mix of resin concrete.Fatigue tests with a large sample were conducted under six stress level and S-N curve, fatigue limit, shape parameter and scale parameter were obtained.Based on the experimental results,fatigue life distribution of resin concrete is studied using fatigue life statistics theory,the fatigue life equation is established. The results show that the lifetime distribution of high-strength resin concrete confirms to Weibull distribution.The fatigue failure of resin concrete is mainly because of its internal generation loss due to its strength and stiffness reduction, the equation of bending fatigue damage of resin concrete were based on damage theory and combined with the related experimental study.The main experimental and theoretical work in this paper include the following aspects:(1) In order to predict the resin concrete in static fatigue load (creep load) under the damage, creep test of resin concrete were conducted, a prediction of resin concrete creep law of development model were builded to reveal the attenuation law of resin concrete creep. The results show that the creep deformation confirm to the character of three-phase decreased, creep developed rapidly in the initial stage and decreased slowly in the intermediary stage, however, it decreased sharply before the specimen ruptured and broken up finally.(2) The residual stiffness of the resin concrete were carried out in the fatigue test process.A prediction of resin concrete stiffness degradation model were established. Residual stiffness (Dynamic modulus) shows three phases disciplinarian of stiffness degeneration in fatigue experiments and decreased rapidly in the initial stage of fatigue test and decreased slowly in the intermediary stage, however, it decreased sharply before the specimen ruptured. The curve shows obvious S type. The fitting curve can predict the resin concrete stiffness degradation rules.(3) In order to predict the residual strength and fatigue life of resin concrete,34 specimens were tested for residual strength. The results of residual strength tests showed a sudden death behavior. The damage evolution was slow initially but increased dramatically before the specimen ruptured. Using the experimental results fitting to the common model of residual strength, the purpose is to establish a prediction model of residual ultimate strength of resin concrete.