Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

Deep alluvial soil deposit of the Mississippi Embayment overlies the New Madrid Seismic Zone. A new nonlinear site response analysis model has been developed for wave propagation in deep soil deposits. The shape of the backbone curve of the model is described by the empirical unified formulas. Extended Masing criteria are used to represent hysteretic loading and unloading of soils. The new model takes into account the influence of the effective confining pressure on the shear modulus degradation and the viscous damping development in soil. The model is implemented into a two-dimensional finite element code in the time domain and calibrated with the recorded motion at Treasure Island during Loma Prieta Earthquake (1989). Results show that this model provides an acceptable outcome with simple input parameters. Finally, the new model is implemented into the site response analysis at a Missouri highway bridge site. The results show that the influence of the confining pressure is significant for the site response analysis of deep soil sediments.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Nonlinear Site Response Analysis in the New Madrid Seismic Zone

New York, New York

Deep alluvial soil deposit of the Mississippi Embayment overlies the New Madrid Seismic Zone. A new nonlinear site response analysis model has been developed for wave propagation in deep soil deposits. The shape of the backbone curve of the model is described by the empirical unified formulas. Extended Masing criteria are used to represent hysteretic loading and unloading of soils. The new model takes into account the influence of the effective confining pressure on the shear modulus degradation and the viscous damping development in soil. The model is implemented into a two-dimensional finite element code in the time domain and calibrated with the recorded motion at Treasure Island during Loma Prieta Earthquake (1989). Results show that this model provides an acceptable outcome with simple input parameters. Finally, the new model is implemented into the site response analysis at a Missouri highway bridge site. The results show that the influence of the confining pressure is significant for the site response analysis of deep soil sediments.