Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

Equations of Young’s moduli of sands as a function of the axial strain amplitude for different types of dynamic loading were developed from a series of resonant column tests. Ottawa 20-30 sand specimens were excited longitudinally with one of three types of loading at three different confining pressures. In the sinusoidal tests, excitation signals were generated by a variable frequency sine-wave oscillator. In the random tests, input signals were generated by a white-noise generator and a pulse signal generator was used in the impulse tests. Input and output signals were analyzed by an FFT analyzer in the random and impulse loading tests. Under each type of loading it was found that the Young’s modulus normalized with the initial maximum Young’s modulus for the different confining pressures could be unified using a normalized axial strain with a reference axial strain for each loading type. Relationships that determine the variation of the Young’s modulus with the axial strain were developed for each type of loading.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 26th, 12:00 AM Mar 31st, 12:00 AM

Dynamic Youngis Modulus and Axial Strain Relationships

San Diego, California

Equations of Young’s moduli of sands as a function of the axial strain amplitude for different types of dynamic loading were developed from a series of resonant column tests. Ottawa 20-30 sand specimens were excited longitudinally with one of three types of loading at three different confining pressures. In the sinusoidal tests, excitation signals were generated by a variable frequency sine-wave oscillator. In the random tests, input signals were generated by a white-noise generator and a pulse signal generator was used in the impulse tests. Input and output signals were analyzed by an FFT analyzer in the random and impulse loading tests. Under each type of loading it was found that the Young’s modulus normalized with the initial maximum Young’s modulus for the different confining pressures could be unified using a normalized axial strain with a reference axial strain for each loading type. Relationships that determine the variation of the Young’s modulus with the axial strain were developed for each type of loading.