Many researchers agree that the contribution of vehicle overloading in the degradation of road pavement over the environment and the aging of materials is significantly larger. As such, the thesis emphasized overloading vehicles, which is considered a major factor responsible for most pavement damage worldwide.
The thesis aimed to evaluate the effect of overloading on pavement layer deterioration and its effect on the life of the asset and the economic loss induced due to overloading. The input data for analysis were collected as a secondary source. Moreover, KENLAYER, part of the KENPAVE Computer Program, was applied for the pavement layers' nonlinear analysis and critical responses. The damage ratio indicating premature failure of the road is then determined from these critical responses and the actual reduction in service life of the road segment in years was determined. An economic evaluation criterion, the net present value was used to determine the economic loss for two scenarios, with and without overloading for the road investment.
The road segment under study was designed for a traffic of 1.651*10^6 ESAL. On the other side, from the actual traffic and axle load data analysis results, the actual on-road traffic was 3.02*10^6. Thus, the overloaded truck traffic has created an extra load on the road pavement. As a result, pavement structures were damaged in an unexpected situation.
The critical response results revealed that the tensile strain at the bottom of the asphalt layer and compressive strain at the top of the subgrade increased with increasing axle loads. Damage analysis was performed based on the Ethiopian Road Authority failure criterion, the permanent deformation on the top of the subgrade was the governing for the single axle with a single axle. In addition, the fatigue cracking on the bottom of the asphalt layer was the governing condition for single axles with dual wheels, tandem, and tridem axles.
Inhaltsverzeichnis (Table of Contents)
- Introduction
- General
- Background and History of Overloading
- Vehicle Overloading in Ethiopia
- Problem Statement
- The Objective of the Study
- The Main Objective
- The Specific Objective
- The scope of the Study
- Chapter Topics and Organization
- Literature Review
- Introduction
- Axle Load Regulation Practice
- Pavement Damage Assessment due to Overloads
- Impact of Overloading on Structural Layers of Road Pavement
- Pavement Responses Analysis in Multilayer Systems, Available Computer Programs
- KENLAYER Computer Program
- Nonlinear Layers Analysis in KENLAYER
- Response points for Linear and Nonlinear Layers in KENLAYER Analysis
- Stress Adjustment for Computing Modulus
- Economic Evaluation of Overloading
- Methodology
- Research Approach
- Data Collection
- Data Analysis
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This thesis evaluates the impact of vehicle overloading on road pavement layers, focusing on the deterioration of pavement structures and its effect on the asset's life. The research uses a secondary source of data and applies the KENLAYER computer program for nonlinear analysis and determining critical responses on pavement layers. The analysis examines the damage ratio to assess premature failure, calculate the reduction in the road's service life, and evaluate the economic loss due to overloading.
- Impact of vehicle overloading on road pavement layers
- Deterioration of pavement structures
- Reduction in the road's service life
- Economic loss due to overloading
- Application of the KENLAYER computer program for nonlinear analysis
Zusammenfassung der Kapitel (Chapter Summaries)
The introductory chapter provides an overview of the problem of vehicle overloading, highlighting its prevalence in Ethiopia and its adverse effects on road infrastructure. The literature review delves into axle load regulation practices, the assessment of pavement damage due to overloads, and the analysis of pavement responses in multilayer systems. It introduces the KENLAYER computer program and its application in analyzing nonlinear layers. Chapter 3 outlines the methodology employed in the research, including the research approach, data collection techniques, and data analysis methods.
Schlüsselwörter (Keywords)
The research focuses on the impact of vehicle overloading on road pavement layers, employing the KENLAYER computer program for analysis, and evaluating the economic consequences of overloading. Key terms include overloading, pavement service life, KENLAYER, economic evaluation, and damage ratio.
- Quote paper
- Abinet Gidey (Author), 2023, Evaluating the impact of vehicle overloading on the structural layers of road pavement, Munich, GRIN Verlag, https://www.grin.com/document/1436551
