Pavement Damage as Related to Tires, Pressures, Axle Loads, and Configurations
Pavement Damage as Related to Tires, Pressures, Axle Loads, and Configurations

Author: PE. Sebaaly

Publisher:

Published: 1992

Total Pages: 15

ISBN-13:

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Dual radial tires and wide base radial single tires were tested in the laboratory under three levels of inflation pressures and axial loads. The measured characteristics of the tires were gross contact area, net area, tire deflection, and contact pressures. The distributions of contact pressures were used in a theoretical analysis to evaluate the flexible pavement performance related parameter. The response of two flexible pavement structures was investigated in terms of the tensile strains at the bottom of the asphalt layer. In the second phase of this research, two full scale pavement sections were instrumented using strain gages to measure the strains at the bottom of the asphalt concrete layer. The data analysis presented in this paper shows the effect of varying the tire type, tire inflation pressure, and axle load and configuration on the response of flexible pavements. The results of the two studies showed that the wide base single tires are more damaging than the dual tires under all combinations of the test variables.

Estimating Pavement Damage from Longer and Heavier Combination Vehicles
Estimating Pavement Damage from Longer and Heavier Combination Vehicles

Author: James W. Stoner

Publisher:

Published: 1994

Total Pages: 130

ISBN-13:

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There is a great need to study the effects of longer combination vehicles (LCVs) and other types of vehicles on the infrastructure. A computer simulation is perhaps the most effective way of dealing with such a wide range of vehicle and road configurations. With this objective in mind, a comprehensive research project was initiated at the University of Iowa, under the sponsorship of the U.S. Department of Transportation. As a part of this project a computer-aided truck modeling tool was developed to study the dynamic loads exerted on the pavement by trucks of different types and configurations. Using this tool, it is possible to quickly vary truck parameters, such as number of axles and axle spacing, suspension type and characteristics, truck payload and distribution, etc. Dynamic loads can be computed with trucks traveling on typical rough or smooth pavements. Effect of truck speed and pavement joint spacing can be studied. This report summarizes results of a detailed parametric study conducted using this truck modeling software, the status of the commercial network in Iowa that could potentially accommodate LCVs, and the safety and roadway design impacts of allowing LCVs to operate in Iowa. Section 1 of this report provides an introduction to the subject matter. Section 2 presents a general description of the dynamic modeling techniques. Section 3 discusses the current state of the art of rigid pavement modeling, and Section 4 presents a parametric study on the dynamic loads from different vehicle configurations. Section 5 addresses the safety studies performed on LCV operation. Section 6 examines the current state of the Iowa Interstate and commercial highway network available to handle LCV traffic, while Section 7 suggests possible methods for addressing alternative axle load limits on flexible and composite pavement.