Energy-Injecting Virtual Mass Resonant Column System
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 124, Issue 5
Abstract
An innovative resonant column control system is introduced. The system is based on the concepts of energy injection and virtual mass. A unique feature of the system is that it allows the user to specify the resonant frequency and vibrating amplitude for a specimen of unknown mechanical properties. In the system a steady state vibration is maintained by injecting a dissipative energy that automatically compensates for the damping loss, and a prespecified resonant frequency is reached by adding a virtual mass such that the inertia term in the equation of motion matches the stiffness of the specimen for that frequency. This arrangement results in a continuous and automatic measurement of modulus and damping properties under clearly defined test conditions. As a result of automatic operation, the number of vibrating cycles is minimized and so is the disturbance to the soil specimen. In this paper, the principle, the system configuration, the control algorithm, and the calibration and data interpretation procedures are presented. Verification and preliminary test results are reported.
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References
1.
Anderson, D. G., and Richart, F. E.(1976). “Effects of straining on shear modulus of clays.”J. Geotech. Engrg. Div., ASCE, 102(9), 975–987.
2.
Drnevich, V. P., Hall, J. R., Jr., and Richart, F. E., Jr. (1967). “Effects of amplitudes of vibration on shear modulus of sand.”Proc., Int. Symp. on Wave Propagation and Dyn. Properties of Earth Mat., Albuquerque, N.M.
3.
Drnevich, V. P., and Richart, F. E.(1970). “Dynamic prestraining of dry sand.”J. Soil Mech. and Found. Div., ASCE, 96(2), 453–468.
4.
Hardin, B. O.(1965). “The nature of damping in sand.”J. Soil Mech. and Found. Div., ASCE, 91(1), 63–97.
5.
Kim, D. S. (1991). “Deformational characteristics of soils at small to intermediate strains from cyclic tests,” PhD dissertation, Univ. of Texas, Austin, Tex.
6.
Li, X. S. (1982). “Laboratory determination of shear modulus and damping of soils using a microcomputer based instrumentation system,” MS thesis, Univ. of California, Davis, Calif.
7.
Li, X. S., Roblee, C. J., and Wang, G. (1993). “Development of a prototype tool for in situ determination of high-strain dynamic properties of soft to medium-stiff clays.”Rep. No. FHWA/CA/TL-94/05, Calif. Dept. of Transp., Sacramento, Calif.
8.
Morris, D. V.(1990). “Automatic feedback system for resonant column testing.”Geotech. Testing J., 13(1), 16–23.
9.
Richart, F. E., Jr., Hall, J. R., and Woods, R. D. (1970). Vibrations of soils and foundations. Prentice-Hall, Inc., Englewood Cliffs, N.J.
10.
Taylor, P., and Hughes, J. (1965). “Dynamic properties of foundation subsoils as determined from laboratory tests.”Proc., Third World Conf. on Earthquake Engrg., Vancouver, Canada, Vol. 1, 196–212.
11.
Tustin, A. (1947). “A method of analyzing the behavior of linear systems in terms of time series.”JEEE, London, 94(IIA), 130–142.
12.
Vucetic, M.(1994). “Cyclic threshold shear strains in soils.”J. Geotech. Engrg., ASCE, 120(12), 2208–2228.
13.
Wilson, S. D., and Dietrich, R. J. (1960). “Effect of consolidation pressure on elastic and strength properties of clay.”Proc., Res. Conf. on Shear Strength of Cohesive Soils, ASCE, Reston, Va., 419–435.
14.
Zavoral, D. Z., and Campanella, R. G. (1994). “Frequency effects on damping/modulus of cohesive soil.”Proc., Symp. on Dyn. Geotech. Testing II, ASTM, Philadelphia, Pa., 191–201.
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Copyright © 1998 American Society of Civil Engineers.
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Published online: May 1, 1998
Published in print: May 1998
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