Comparison of Soil Response During Earthquake Excitation and Uniform Cyclic Loading

Abstract

Characterization of soil response under cyclic loading is one of the major challenges in evaluating liquefaction triggering. In this paper, the results of numerical simulations are presented for dynamic soil behavior during uniform and earthquake loading. For this purpose, Plasticity Model for Sands (PM4Sand) was utilized to simulate soil behavior for a range of loading intensities. This model incorporates a 2-surface kinematic yield mechanism to simulate soil behavior, and more importantly, considers the effect of fabric change and void ratio evolution during loading. Cyclic soil behavior was simulated under a series of uniform sine wave loading and earthquake excitations under controlled boundary conditions and stress paths. Dissipated energy and accumulated pore water pressures were evaluated during these simulations. Triggering of liquefaction was also monitored with different failure criteria. Thereafter, soil behavior was characterized, and a new approach was developed to represent earthquake time histories by equivalent uniform stress series. The proposed approach relates earthquake to uniform loading by the energy dissipated during the stress time history.

Meeting Name

International Foundations Congress and Equipment Expo 2015, IFCEE 2015 (2015: Mar. 17-21, San Antonio, TX)

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Cyclic Loads; Earthquakes; Energy Dissipation; Soil Liquefaction; Soils, Dissipated Energy; Earthquake Excitation; Earthquake Loadings; Failure Criteria; Plasticity Model; Pore-Water Pressures; Uniform Loading; Yield Mechanism, Loading

International Standard Book Number (ISBN)

978-078447908-7

International Standard Serial Number (ISSN)

0895-0563

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Mar 2015

Link to Full Text

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