Mekanistik ampirik esnek üstyapı tasarım modellerinin tabaka kalınlık ve rijitlik oranlarına bağlı olarak karşılaştırılması

Year 2021, , 91 - 102, 15.01.2021

Murat Bostancıoğlu

https://doi.org/10.17714/gumusfenbil.773172

Cited By: 1

Abstract

Esnek üstyapıların tasarımında kullanılan mekanistik-ampirik yöntemlerde, trafik yükü ve çevresel etkiler altındaki kesitin mekanik tepkileri belirlenerek elde edilen bu değerler ampirik transfer denklemleri ile yol ömrü değerlerine dönüştürülmektedir. Farklı kuruluşlar tarafından önerilen ampirik modellerde dikkate alınan iki temel bozulma tipi yorulma ve tekerlek izidir. Bu iki bozulma tipine göre literatürde önerilen çok sayıda yol ömrü modeli bulunmakta ve bu modeller birbirlerinden önemli ölçüde farklı katsayılar içermektedir. Aynı kuruma ait yorulma ve tekerlek izi modelleri ile yapılan analizlerde dahi elde edilen yol ömrü değerleri birbirlerinden önemli ölçüde farklılık göstermektedir. Bu çalışmada seçilen geleneksel bir üstyapı kesiti için farklı ampirik modeller ile yol ömrü analizleri yapılmıştır. Yüzey ve temel tabakasının değişen rijitlik ve kalınlık oranlarına bağlı olarak transfer denklemleri birbirleri ile karşılaştırılmıştır. Elde edilen sonuçlar tüm kuruluşlar için tekerlek izi modelleri ile hesaplanan yol ömrü değerlerinin yorulma modelleri ile hesaplanan değerlerden fazla olduğunu göstermektedir. Temel tabakası rijitliğinin, yüzey tabakası rijitliğine kıyasla azalması durumunda farklı modellerden elde edilen sonuçlar birbirlerine yaklaşmaktadır. Yüzey tabakası kalınlığının temel tabakası kalınlığına kıyasla artması durumunda ise modellerin birbirlerinden önemli ölçüde farklı sonuçlar verdiği tespit edilmiştir.

Keywords

Kaplama ömrü, Mekanistik-Ampirik tasarım, Tekerlek izi, Transfer modelleri, Yorulma

Comparison of mechanistic empirical flexible pavement design models based on layer thickness and stiffness ratios

Abstract

In mechanistic-empirical methods used in the design of flexible pavements, the mechanical responses of the cross-section under traffic load and environmental influences are determined and these values are converted into pavement life values with empirical transfer equations. The two main types of distress considered in empirical models recommended by different organizations are fatigue and rutting. According to these two distress types, there are many pavement life models proposed in the literature and these models contain significantly different coefficients. Even in the analyzes made with the same institution's fatigue and rutting models, the pavement life values differ significantly from each other. In this study, pavement life analyzes were performed with different empirical models for a traditional pavement cross-section. Transfer equations are compared with each other depending on the changing stiffness and thickness ratios of the surface and base layer. The results obtained show that the pavement life values calculated with rutting models for all organizations are higher than the values calculated with fatigue models. If the base layer stiffness decreases compared to the surface layer stiffness, the results obtained from different models converge. In case the surface layer thickness increases compared to the base layer thickness, it is determined that the models give significantly different results from each other.

Keywords

Pavement Life, Mechanistic-Empirical Design, Rutting, Transfer Models, Fatigue

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