Study On Fatigue Property Of The CrtsⅢ Slab Track

With the completion of a number of high-speed railways’construction and operation, the development of high-speed railway dominated by non-ballasted track in China has reached a certain degree;the non-ballasted track with reinforced concrete in the high-density and high-speed trains、the repeated temperature of the natural environment down,the damage most likely occurred in the design life.The study of fatigue of the ballastless at home and abroad is little, therefore,the research has practical significance.In this article，for the study of the CrtsⅢ slab track structure,using the finite element method with ABAQUS and MSC.FATIGUE finite element software based on the classical fatigue damage theory,have studied the CrtsⅢ slab track structure’s fatigue properties.we have collected and collated the the development of the slab track and the fatigue of Ballastless Research at home and abroad,in a comparative analysis of four kinds of fatigue damage accumulation theory’s advantages and disadvantages in engineering applications,finally we decided to use P-M fatigue damage theory. In this article, we have described the theory of damage mechanics, methods, and four concrete damage models, and finally used the CDP model for the calculation of this concrete constitutive model. Reference to existing research, we have determined S-N curve fatigue equation of concrete and steel.Based on the fatigue damage theory and the S-N curve fatigue theory,we have calculate predicte the fatigue life of the CrtsⅢ slab track structure in the train load and temperature loads. Been in train loads, the occurrence of fatigue trauma of the track plate region is dominated by rail panel bearing rail station areas, and gradually extended; and the occurrence of the self-compacting concrete layer began from the edge of self-compacting concrete layers, gradually extended to the internal trend. Been in temperature loads, the occurrence of fatigue trauma of the track plate region first appeared in the middle area of the slab, and the expansion of the fatigue trauma developed rapidly at the vertical. Self-compacting concrete layer’s fatigue trauma appeared at the edge of self-compacting concrete layer, and its vertical development of fatigue trauma faster than the horizontal.