ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 8

Dynamic Shear Modulus and Damping Ratio from Random Loading Tests

Al-Sanad, H
Assistant professor, College of Engineering and Petroleum, Kuwait University, Khaldiah,

Aggour, MS
Assistant professor, College of Engineering and Petroleum, Kuwait University, Khaldiah,

Yang, JCS
Associate professor and professor, Civil and Mechanical Engineering Departmentsmember of ASTM, College of Engineering University of Maryland, College Park, MD

Abstract

Dynamic shear modulus and damping ratio determination from random loading tests on dry Monterey and Ottawa sands in a resonant column device, in addition to sinusoidal loading, are presented. In the random excitation test, white noise was used to excite the specimens, and the responses of the specimens were analyzed by the random decrement technique. Using a sine-wave generator, the dynamic soil properties were also determined by the conventional technique. The results obtained indicated a good agreement between the modulus and damping obtained from the application of sinusoidal or random loading. It was concluded that the relationship of shear modulus and damping ratio with shear strain amplitude is independent of random or sinusoidal forcing functions within the range of variables tested.

Keywords:
sands, cohesionless soils, damping, random loading, shear modulus, resonant column, random decrement technique, logarithmic decrement

Paper ID: GTJ10840J
DOI: 10.1520/GTJ10840J
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