Asphalt Pavement Loads And Fatigue Characteristics Of The Temperature Coupling

The asphalt concrete pavement, as the road structure's surface course, is bared completely in the environment, receiving all kinds of vehicle load repeated action and seasonal environment various influence. The common action of vehicle load and varying temperature should be taken into account when we research the asphalt concrete pavement structure's performances of mechanics and fatigue.This paper mainly researches the asphalt concrete pavement structure fatigue performance under seasonal environment temperature and repeated vehicle load. Firstly, calculate the asphalt pavement structure response in linear elastic static load condition by FEM software. Afterwards, analyze detailed the pavement structure stable temperature field at each main time, transient temperature field changing process in 2D plane strain state in a day under summer and winter typical weather condition and the asphalt pavement structure temperature stress distributing and change regularity in the heat linear elastic plane strain premise. Finally, the coupling effect of temperature and load is predigested to repeated addition of stress on basis of heat linear elastic. The asphalt concrete pavement structure fatigue mechanism is discussed and the theoretic fatigue life of pavement is given using test regression formula besides.The calculation results indicate, load stress is mainly influence factor to fatigue failure of asphalt concrete pavement, and temperature stress shouldn't be ignored also. The main cause of asphalt concrete pavement structure fatigue cracking destroy is the double action by periodic varying of temperature stress and wheel load. The destroy mechanism is the fatigue damage by both repeated actions.