沥青路面结构可靠性分析及其有限元模拟.pdfVIP

Abstract The design quality of asphalt pavement has improved greatly, for its design method has been changed to probability method from definite method. But the choose of design parameter in criterion is also on definite theory, so the different of action condition between designed pavement structure and virtual pavement structure is greater, because many random factors affect virtual pavement structure. Function of deflection control index is established. Random perturbation theory and reliability theory are used to analyze the effect of random parameters to asphalt pavement structure reliability index, considering mutual independent random variables. These random parameters, which fluctuate around their means value, are traffic parameter, structural parameter and geometric parameter. The more sensitive correlation coefficients are found out at correlation condition in general stochastic space. At last, asphalt pavement structure reliability index can be computed by using self-programming, in which the Monte Carlo method and ANSYS software are both applied. Results are as follows: 1. The sensitivity of asphalt pavement structure reliability index to load, roadbase thickness ，thickness of surface and foundation elastic modulus is greater under normal temperature condition. The sensitivity to temperature is greatest under the high temperature condition. 2. The effect of correlation coefficient, which is among elastic modulus of surface ， roadbase elastic modulus and foundation elastic modulus, to reliability index is greater than other parameters’. Result shows that some correlation should not be ignored in the analysis of pavement structure reliability.