The Structure Analysis And Useful Life Exploring Of BFRP Continuously Reinforced Composite Pavement

BFRP(basalt fiber reinforced polymer) continuously reinforced composite pavement is a new type of pavement structure. For the analysis of this new pavement structure, the finite element software ABAQUS is used to built the2D and3D model. In models, the influence of traffic load, environment temperature, thickness of pavement structure layer, interlayer contact condition and other factors is considerd. The load stress, pavement temperature field, and temperature warping stress is analyzed in the models. According to the results of the model calculation and the traditional cement concrete fatigue equation, the theory lifetime of CRC layer is explored.Firstly, the load stress model about BFRP continuously reinforced composite pavement is built, in addition, the model is based on the linear elastic theory, elastic half-space foundation and crack pattern. In this model, the cohesive element is applied to define the normal and tangential contact constitutive behavior of cracks, and the friction coefficient is used to define the contact relationship between CRC layer and base. After analysis, the critical load position under different transverse crack spacing is found out. In both cases of BFRP reinforcement and steel reinforcement, the influence of different pavement structure parameters on the concrete slab stress is discussed.Secondly, through the analysis of the meteorological data of test road in Zhejiang province, the two-dimensional temperature field model is built, which is based on the thermodynamics theory and finite element method. Through analysis and discussion, the pavement temperature field and temperature gradient in different time is discussed, and the influence of thickness of AC layer on the maximum temperature gradient of CRC layer is analyzed.Thirdly, the temperature warping stress model which considers about the influence of AC layer and adjacent concrete slab is established on the elastic half-space foundation. According to the temperature field analysis results of maximum temperature gradient, the influence of different parameters on the temperature warping stress is discussed, such as the thickness of AC and CRC layer, modulus of AC and CRC layer, reinforcement ratio, width of panel and joint shear stiffness.Lastly, on the basis of the finite element calculation results of load stress and temperature warping stress, the theory lifetime of CRC layer is got by the traditional cement concrete fatigue equation The influence of the thickness of AC and CRC layer, width of panel, joint shear stiffness and modulus of soil on the theory lifetime of CRC layer is discussed.