Permanent pavement structure fatigue reliability evaluation method based on parameter bounded distribution

Abstract

The invention discloses a permanent pavement structure fatigue reliability evaluation method based on parameter bounded distribution. The method comprises the following steps: 1) obtaining variability statistical characteristics of pavement design input parameters; 2) generating a random number conforming to a classic distribution model according to variability statistical characteristics of the obtained pavement design input parameters; (3) judging whether the generated random numbers conform to a specified interval range or not, and screening the random numbers conforming to the range until the random numbers conform to the parameter truncation distribution model of the specified statistical characteristics in the step (1); 4) establishing a limit state equation Z of a pavement structure fatigue index and an accumulated equivalent axis number; (5) judging the state of the structural performance function according to the steps (3) and (4); (6) setting the cycle index N, repeating the steps (2)-(5), and counting the number p of times when Zi is greater than 0 and the number q of times when Zi is less than 0; 7) based on the step 6), drawing a reliability convergence curve of p / (p + q), and judging reliability convergence; and 8) obtaining the reliability of the pavement structure.

Description

technical field [0001] The invention relates to the field of pavement structure fatigue reliability evaluation, in particular to a permanent pavement structure fatigue reliability evaluation method based on parameter bounded distribution. Background technique [0002] Since the mechanical response expression of pavement structure contains infinite Bessel integral functions that are not easy to be explicit and partial derivatives, the calculation of pavement structure reliability is usually based on numerical simulation such as Monte Carlo method. Before the implementation of the Specification for Design of Highway Asphalt Pavements (JTG D50-2017) in September 2017, the inspection calculation and reliability analysis of the pavement structure mainly revolved around the deflection and bottom tensile stress indicators. In September 2017, the "Code for Design of Highway Asphalt Pavements" (JTG D50-2017) abolished the deflection and other verification indicators, and revised the ...

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Problems solved by technology

In the existing research, there are no reports on the reliability evaluation methods and procedures of the permanent asphalt pavement structural surface, base and subgrade.

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