EFFECT OF SOIL PLASTICITY ON DAMPING RATIO AT SMALL CYCLIC STRAINS
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概要
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In soil dynamics, the most common parameter for measuring soil damping is the equivalent viscous damping ratio, which is derived from the theory of a single-degree-of-freedom system with viscous dashpot. The results of a comprehensive literature review on the equivalent viscous damping ratio at small cyclic shear strain amplitudes, γ_c, between 0.0001% and 0.01% are presented and discussed. On the basis of the published data from different types of laboratory tests two important trends are established. The first is a significant increase of the scatter of the data points as the plasticity index of the soil, PI, decreases. This indicates that damping in low-plasticity clays and sands is more sensitive to factors such as confining stress, overconsolidation ratio and cyclic loading waveform than the damping in high-plasticity clays. The second trend is an increase of the damping ratio with PI. This trend with PI is opposite from the trend at γ_c>0.01% established earlier, where damping ratio generally decreases with PI. An explanation is provided that the phenomena responsible for the increase of the damping ratio with PI at small γ_c are viscous creep and relaxation of the soil.
- 社団法人地盤工学会の論文
- 1999-08-15
著者
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Vucetic M
Associate Professor Civil And Environmental Engineering Department University Of California Los Ange
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Lanzo G
Assistant Professor Structural And Geotechnical Engineering Department University Of Rome"la Sa
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LANZO GIUSEPPE
Assistant Professor, Structural and Geotechnical Engineering Department, University of Rome"La Sapienza", Rome, Italy.
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VUCETIC MLADEN
Associate Professor, Civil and Environmental Engineering Department, University of California, Los Angeles, CA 90095-1593, USA. Manuscript was received for review on May 15, 1998. Written discussions on this paper should be submitted before March 1, 2000
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Vucetic M.
Associate Professor, Civil and Environmental Engineering Department, University of California, Los Angeles, CA 90095-1593, USA. Manuscript was received for review on May 15, 1998. Written discussions on this paper should be submitted before March 1, 2000
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Lanzo G.
Assistant Professor, Structural and Geotechnical Engineering Department, University of Rome"La Sapienza", Rome, Italy.