Experimental Study on Fatigue Performance of Concrete in Ballastless Rrack of High-Speed Railway
Combined with the loading state of ballastless track concrete,the relationship between fatigue performance and fatigue test parameters of concrete was discussed by Weibull distribution function.The re-sults show that the fatigue performance of concrete changes more significantly under bending fatigue load-ing,and the ballastless track is more prone to fatigue failure under fatigue load.The higher the loading fre-quency,the greater the dispersion degree of concrete fatigue life.In the range of 5-15 Hz,the loading fre-quency has little influence on the fatigue life of concrete.The fatigue life of concrete has the minimum dis-persion degree at 0.6 stress level.The fatigue life and dispersion degree of concrete are smaller under con-stant amplitude sine wave loading.Considering the test efficiency,result accuracy and loading amplitude,it is suggested to take"bending fatigue,constant amplitude sinusoid,f=20 Hz、S=0.6、λ=0.1"as the fatigue test system of ballastless track concrete.
ballastless track concretehigh-speed railWeibull distribution functiontest
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