Lecture 32 PCA Method Background and Computer ProgramBase on the assumption that each load applied to a pavement uses up a percent of the fatigue life of the pavement. The solution is determined by summing the percent of fatigue life used by the anticipated traffic during the design life of the pavement.Traffic in terms of axle configuration and loadsFatigue analysisErosion analysisLecture 32 PCA Method Background and Computer Program Base on the assumption that each load applied to a pavement uses up apercent of the fatigue life of the pavement. The solution is determined by summing the percent of fatigue life used by the anticipated traffic during the design life of the pavement.To do the design it is necessary to have Flexure strength of the concrete - MOR by 1/3 pt loadingModulus of sub grade reaction including the correctionassociated with aggregate base thicknessTraffic in terms of axle configuration and loadsLoad factorsInterstate - 1.2Arterial - 1.1Local access - 1.0Design is based on Fatigue analysisDetermine equivalent stress associate with sub grade reaction and pavement thickness-Fig 21.11 and 21.12Determine stress ratio = equivalent stress/MOR Determine allowable number of stress application at the given axel loadRepeat for all stress levelsCalculate the % fatigue life used for each applied load. The sum for all loads must be lessthen 100%Erosion analysisBasically the same method is used as in the fatigue analysis. See the sample form in the book Fig
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