Impact of Truck Characteristics on Pavements
Impact of Truck Characteristics on Pavements

Author: Stuart W. Hudson

Publisher:

Published: 1992

Total Pages: 226

ISBN-13:

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Truck load equivalency factors relate vehicle axle loads to pavement damage and life. They provide a method to convert the effects of mixed traffic to a standard loading condition. Equivalent loadings for most pavement design and evaluation procedures are currently predicted using the AASHTO method of equivalency factors. This study was undertaken to evaluate various types of primary pavement response derived load equivalency factors. These use pavement response measurements such as strain and deflection to estimate the equivalent damaging effect of any axle loading condition. These types of factors are also expressed in terms of a relative number of equivalent standard axle loads. A number of primary response equivalency factor methods were evaluated and several selected for further study. Deflection and strain pavement response measurements were evaluated over an experimental factorial of axle type, axle load, tire pressure, speed, pavement thickness, and pavement temperature. Primary response load equivalencies were calculated using the selected methods and a number of statistical comparisons were made.

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.