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- W604822968 abstract "The current pavement design code uses a linear damage accumulation rule to predict jointed plain concrete pavements (JPCP) transverse fatigue cracking. The linear damage rule is useful when dealing with high cycle fatigue scenarios in which millions of load repetitions are rapidly processed and converted to damage. However, several studies have shown that there is a load history effect in concrete which may jeopardize the accuracy of the linear damage rule. In this study, the load history effect is investigated more closely within the context of concrete pavement bottom up fatigue cracking. To achieve this, a modification to the original Slowik variable amplitude fatigue fracture model is made in order to predict fatigue cracking in the deceleration stage. Eight three point bend notch specimens were subjected to random loading fatigue tests to validate the model. The fracture model was then used to construct and calibrate an S-N curve that was then matched to the S-N curve used in MEPDG. A Monte Carlo simulation of truck traffic loading was then conducted to assess the effect of loading sequence using the default truck and axle distributions in MEPDG. The stresses were calculated by an interpolation scheme using a stress database of 40,000+ points that was constructed with the use of EVERFE. The results of this study suggest that the non-linear damage accumulation under random loading is more severe than the linear damage accumulation rule shows. The reason for this is that the linear model cannot predict damage accurately after a significant overload (SR 0.7-0.9) has been applied to the pavement, which is consistent with the findings of several other researchers." @default.
- W604822968 created "2016-06-24" @default.
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- W604822968 date "2012-01-01" @default.
- W604822968 modified "2023-09-23" @default.
- W604822968 title "Effect of Non-linear Damage Accumulation on Fatigue Cracking Predictions in Concrete Pavements" @default.
- W604822968 hasPublicationYear "2012" @default.
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