The Resource Direct calculation of maximum curvature and strain in AC layers of pavements from load deflection basin measurements

Direct calculation of maximum curvature and strain in AC layers of pavements from load deflection basin measurements

Label
Direct calculation of maximum curvature and strain in AC layers of pavements from load deflection basin measurements
Title
Direct calculation of maximum curvature and strain in AC layers of pavements from load deflection basin measurements
Creator
Subject
Language
eng
http://library.link/vocab/creatorName
Jung, Friedrich W
LC call number
TE278 .J95 1989
http://library.link/vocab/subjectName
  • Deflection
  • Deflectographs
  • Falling weight deflectometers
  • Pavements, Flexible
  • Pavements
  • Stresses
  • Structural analysis
  • Thickness
Label
Direct calculation of maximum curvature and strain in AC layers of pavements from load deflection basin measurements
Instantiates
Publication
Note
"Deflection measurements under impulse load carried out with the falling weight deflectometer (FWD) are usually processed by using elastic layer analysis programs, back-calculating layer moduli from measured deflections, and then forward-computing critical performance parameters such as stresses and strains at locations under the load. In spite of the quality of the programs used, calculations are cumbersome and not always reliable. This report presents a more direct, and more reliable way of computing some of those parameters in the top layer, especially the important value of horizontal strain at the bottom of this layer. The measured deflections from an FWD test, the radius of load distribution and the thickness under the load are the only data needed to calculate the curvature and the strains in the top layer of a pavement structure. in the proposed method, the maximum curvature of the deflection basin under the load is calculated directly from measured FWD deflections and the radius of load distribution. The strains in the top layer are then determined by the given layer thickness near the load. Corresponding stresses can also be calculated, but additional information is needed, namely the elastic stiffness of the first layer, Poisson's ratio, and the load-induced vertical stress."
Extent
27 p.
System control number
(EOS.Web)10191
Label
Direct calculation of maximum curvature and strain in AC layers of pavements from load deflection basin measurements
Publication
Note
"Deflection measurements under impulse load carried out with the falling weight deflectometer (FWD) are usually processed by using elastic layer analysis programs, back-calculating layer moduli from measured deflections, and then forward-computing critical performance parameters such as stresses and strains at locations under the load. In spite of the quality of the programs used, calculations are cumbersome and not always reliable. This report presents a more direct, and more reliable way of computing some of those parameters in the top layer, especially the important value of horizontal strain at the bottom of this layer. The measured deflections from an FWD test, the radius of load distribution and the thickness under the load are the only data needed to calculate the curvature and the strains in the top layer of a pavement structure. in the proposed method, the maximum curvature of the deflection basin under the load is calculated directly from measured FWD deflections and the radius of load distribution. The strains in the top layer are then determined by the given layer thickness near the load. Corresponding stresses can also be calculated, but additional information is needed, namely the elastic stiffness of the first layer, Poisson's ratio, and the load-induced vertical stress."
Extent
27 p.
System control number
(EOS.Web)10191

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