MTU CE 3401 - LECTURE NOTES (2 pages)

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LECTURE NOTES



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LECTURE NOTES

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Lecture Notes


Pages:
2
School:
Michigan Tech
Course:
Ce 3401 - Transportation Engineering

Unformatted text preview:

Lecture 32 PCA Method Background and Computer Program Base 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 To do the design it is necessary to have Flexure strength of the concrete MOR by 1 3 pt loading Modulus of sub grade reaction including the correction associated with aggregate base thickness Traffic in terms of axle configuration and loads Load factors Interstate 1 2 Arterial 1 1 Local access 1 0 Design is based on Fatigue analysis Determine equivalent stress associate with sub grade reaction and pavement thickness Fig 21 11 and 21 12 Determine stress ratio equivalent stress MOR Determine allowable number of stress application at the given axel load Repeat for all stress levels Calculate the fatigue life used for each applied load The sum for all loads must be less then 100 Erosion analysis Basically the same method is used as in the fatigue analysis See the sample form in the book Fig 20 9



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