Results 141 to 150 of about 13,004 (197)

Designing Stormwater Chambers to Meet AASHTO Specifications

Journal of ASTM International, 2010
Abstract Thermoplastic stormwater chambers have been successfully used on many projects to meet current federal regulations controlling discharges from newly developed sites. These structures are commonly located under parking lots or roadways and subjected to vehicular loads on a regular basis.
Timothy J. McGrath, David Mailhot
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AASHTO Direct Structural Capacity Method Error Analysis

Journal of Transportation Engineering, 1992
The AASHTO Direct Structural Capacity method utilizes an approximate composite pavement modulus to predict an effective structural number based on deflection measurements. An analysis of the errors associated with the approximation is presented. The modulus approximation is purported to predict a composite pavement’s modulus to within 15% when its base
Ronald L. Baus, Andrew M. Johnson
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Status of the AASHTO Accreditation Program

Geotechnical Testing Journal, 1989
Abstract The American Association of State Highway and Transportation Officials (AASHTO) approved the establishment of the AASHTO Accreditation Program (AAP) in February 1988 and the first laboratory was accredited in June 1988. The objective of the AAP is to provide a mechanism for formally recognizing the competency of construction ...
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AASHTO Drainage Coefficients for Flexible Pavements

Transportation Research Record: Journal of the Transportation Research Board, 2001
A method for determining AASHTO drainage ( m) coefficients for flexible pavements is presented. In essence, m coefficients were developed as ratios of the layer coefficients of the AASHO road test granular base material under any given drainage and climate condition to the layer coefficient of the road test base material under road test site ...
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Placement of AASHTO Type 6 Modified Bridge Girders

Practice Periodical on Structural Design and Construction, 2002
The Arizona Department of Transportation SR 101 Pima Freeway project included construction of the bridge discussed in this case study. This particular bridge is a mainline span over Tatum Boulevard. The aspects of construction discussed here encompass a description of AASHTO Type 6 Modified prestressed girders, the planning process for setting the 19 ...
Scott A. David, Cliff J. Schexnayder
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AASHTO-LRFD Live Load Distribution Specifications

Journal of Bridge Engineering, 2000
The live load distribution factors contained in the AASHTO-LRFD Bridge Design Specification present a major change to the AASHTO-LFD specifications that have been in effect for more than 50 years. This change has generated some interest in the bridge engineering community and has raised some questions.
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AASHTO Seismic Isolation Design Requirements for Highway Bridges

Journal of Structural Engineering, 1992
In October 1990, the American Association of State Highway and Transportation Officials AASHTO adopted Guide Specifications for the Seismic Isolation Design of Highway Bridges.
Ronald L. Mayes, Ian G. Buckle, Trevor E. Kelly, Lindsay R. Jones   +3 more
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FORTRAN Code for 1986 AASHTO Guide Equations

Journal of Transportation Engineering, 1990
Function subprograms are provided for the solution of the AASHTO equations for both flexible and rigid pavement design using the well known Newton-Raphson root finding numerical solution technique. The code was written for the Microsoft® version 4.1 FORTRAN optimizing compiler for microcomputers.
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ESNEK ÜSTYAPILARIN TASARIMLARINDA AASHTO-72 VE AASHTO-86C YÖNTEMLERİNİN ANALİTİK VE EKONOMİK KARŞILAŞTIRILMASI

2007
The effects of the constructional design (thickness of layers and types) and loading conditions (axle loading and repetition number) on pavement, and also the change of the pavement performance under repeated loading are considered in AASHTO-72 design method. As for AASHTO-86 design method, the effects of the drainage conditions on pavement, the change
KÖK, Baha Vural, KULOĞLU, Necati
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Optimization of AASHTO DNPS86 Pavement Design Program

Journal of Transportation Engineering, 1991
A nonlinear optimization program is developed to accept the AASHTO DNPS86 pavement design computer program as a subroutine. This enables the obtaining of the least cost design for flexible and rigid pavements without manual interation. Examples illustrate using the 3 design variables for rigid pavements (reliability, subbase thickness, and performance ...
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