Practical implementation of analysis routines for nonlinear seismic ground response analysis

On Lei A. Kwok, Jonathan P. Stewart, Youssef M A Hashash, Neven Matasovic, Robert Pyke, Zhiliang Wang, Zhaohui Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

One-dimensional seismic ground response analyses are often performed using equivalent-linear procedures, which require few, generally well-known parameters (shear wave velocity, modulus reduction and damping versus shear strain, and soil density). Nonlinear analyses provide a more robust characterization of the true nonlinear soil behavior, but their implementation in practice has been limited, which is principally a result of poorly documented and unclear parameter selection and code usage protocols. Moreover, the benefits and potentials of nonlinear analysis relative to equivalent linear are not well defined. In this paper, we present preliminary results of a "benchmarking study" of nonlinear ground response analysis procedures. Key issues that are discussed include: (1) use of reference strain, which can be readily estimated as a function of plasticity index and effective stress, in lieu of dynamic shear strength as a parameter defining the nonlinear backbone curve; (2) strategies for managing excessive large-strain material damping that occurs when Masing's rule is applied to the backbone curve to evaluate hysteretic damping; (3) specification of input motion as "outcropping" (i.e., equivalent free-surface motions) versus "within" (i.e., motion recorded at depth in a vertical array); and (4) specification of viscous damping, specifically the target value of the viscous damping ratio and the frequencies for which the viscous damping produced by the model matches the target.

Original languageEnglish (US)
Title of host publication8th US National Conference on Earthquake Engineering 2006
Pages1614-1623
Number of pages10
StatePublished - 2006
Event8th US National Conference on Earthquake Engineering 2006 - San Francisco, CA, United States
Duration: Apr 18 2006Apr 22 2006

Publication series

Name8th US National Conference on Earthquake Engineering 2006
Volume3

Other

Other8th US National Conference on Earthquake Engineering 2006
Country/TerritoryUnited States
CitySan Francisco, CA
Period4/18/064/22/06

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Fingerprint

Dive into the research topics of 'Practical implementation of analysis routines for nonlinear seismic ground response analysis'. Together they form a unique fingerprint.

Cite this