Road Responses to Vibration Tests

by Michael E. Szendrei, Chf. Res. Ofcr.; Natl. Inst. for Road Res. of South African Council for Scientific and Industrial Res., Pretoria, Africa,
Charles R. Freeme, Res. Ofcr.; Natl. Inst. for Road Res. of South African Council for Scientific and Industrial Res., Pretoria, Africa,


Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 6, Pg. 2099-2124


Document Type: Journal Paper

Abstract:

The dynamic properties of road pavements are measured with equipment using small vibrational forces (< 25 kg), after verification of the condition of elastic linearity in pavement behavior. With minor modifications, this equipment is suitable for wave propagation, attenuation and impedance measurements. Approximate simple methods, verified in practice, have been employed to determine the attenuation in, and Young's moduli of, the various road layers, while a seven-parameter mechanical model was devised to explain the experimental impedance curves. A Fourier analysis was applied to the results of impedance measurements made over a wide frequency range, to predict road deflections caused by an impulse function of any shape, and the treatment was verified experimentally. Results from wave propagation, attenuation and impedance measurements were combined to evaluate road deflections under a moving wheel load.



Subject Headings: Wave measurement | Wave attenuation | Verification | Highways and roads | Vibration | Dynamic properties | Equipment and machinery | Wave propagation

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