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Title: Establishing Outcrop Time Series at Various Depths in a Nonlinear Soil Column: An Iterative Approach

Abstract

Seismic soil-structure interaction (SSI) analysis of nuclear facilities is an important consideration during design and retrofit. SSI tools used in the nuclear industry are currently based on an equivalent linear approach. Procedures for developing input ground motion for equivalent linear approaches are well established. However, the procedures for establishing input ground motion for Nonlinear Soil-Structure Interaction (NLSSI) analysis of nuclear facilities is not well established. A collaborative research group at Idaho National Laboratory (INL) has recently developed analytical methods and numerical tools for using NLSSI analysis for nuclear facility seismic calculations. NLSSI analysis for a nuclear facility allows for calculation of seismic wave motion through a near field soil domain using either, (1) vertically propagating shear and compressive waves, which is the current industry practice, or (2) a three-dimensional non-vertical wave field. This paper presents an iterative procedure for establishing outcrop motion at a depth in the soil column for NLSSI analysis that uses vertically propagating shear waves. The approach presented in this paper starts with a known ground motion at the surface, deconvolves to a depth, and then convolves the obtained motion up to a different desired location of input for the NLSSI model. To demonstrate the validity ofmore » the approach a finite element soil column, that is representative of a nuclear facility site in the US, is used to produce compatible outcrop seismic time series for reduced nonlinear soil mesh depths. The developed approach for reducing the nonlinear soil column model depth is a two-step iterative method; 1) the first step is establishing an outcrop time series at the lowest depth considered that produces the top-of-soil response spectrum of an actual recorded ground motion, and 2) the second step is providing compatible outcrop time series at a shallower depth based on the information from the first step. The comparison of the 5% damped response spectrum from the resulting acceleration time series based on the iterated outcrop motions and the original acceleration time series are conducted. The study showed that the proposed iterative approach produced comparable results within 1% range of the original recorded time series results when sufficient iterations were performed.« less

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1542613
Report Number(s):
INL/JOU-17-44202-Rev000
Journal ID: ISSN 0029-5450
Grant/Contract Number:  
AC07-05ID14517
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Technology
Additional Journal Information:
Journal Volume: 205; Journal Issue: 4; Journal ID: ISSN 0029-5450
Publisher:
Taylor & Francis - formerly American Nuclear Society (ANS)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Nonlinear; Soil-Structure Interaction; Nuclear facilities; nonlinear; site response analysis

Citation Formats

Spears, Robert E., Kurt, Efe G., and Coleman, Justin L. Establishing Outcrop Time Series at Various Depths in a Nonlinear Soil Column: An Iterative Approach. United States: N. p., 2018. Web. doi:10.1080/00295450.2018.1507393.
Spears, Robert E., Kurt, Efe G., & Coleman, Justin L. Establishing Outcrop Time Series at Various Depths in a Nonlinear Soil Column: An Iterative Approach. United States. doi:10.1080/00295450.2018.1507393.
Spears, Robert E., Kurt, Efe G., and Coleman, Justin L. Wed . "Establishing Outcrop Time Series at Various Depths in a Nonlinear Soil Column: An Iterative Approach". United States. doi:10.1080/00295450.2018.1507393. https://www.osti.gov/servlets/purl/1542613.
@article{osti_1542613,
title = {Establishing Outcrop Time Series at Various Depths in a Nonlinear Soil Column: An Iterative Approach},
author = {Spears, Robert E. and Kurt, Efe G. and Coleman, Justin L.},
abstractNote = {Seismic soil-structure interaction (SSI) analysis of nuclear facilities is an important consideration during design and retrofit. SSI tools used in the nuclear industry are currently based on an equivalent linear approach. Procedures for developing input ground motion for equivalent linear approaches are well established. However, the procedures for establishing input ground motion for Nonlinear Soil-Structure Interaction (NLSSI) analysis of nuclear facilities is not well established. A collaborative research group at Idaho National Laboratory (INL) has recently developed analytical methods and numerical tools for using NLSSI analysis for nuclear facility seismic calculations. NLSSI analysis for a nuclear facility allows for calculation of seismic wave motion through a near field soil domain using either, (1) vertically propagating shear and compressive waves, which is the current industry practice, or (2) a three-dimensional non-vertical wave field. This paper presents an iterative procedure for establishing outcrop motion at a depth in the soil column for NLSSI analysis that uses vertically propagating shear waves. The approach presented in this paper starts with a known ground motion at the surface, deconvolves to a depth, and then convolves the obtained motion up to a different desired location of input for the NLSSI model. To demonstrate the validity of the approach a finite element soil column, that is representative of a nuclear facility site in the US, is used to produce compatible outcrop seismic time series for reduced nonlinear soil mesh depths. The developed approach for reducing the nonlinear soil column model depth is a two-step iterative method; 1) the first step is establishing an outcrop time series at the lowest depth considered that produces the top-of-soil response spectrum of an actual recorded ground motion, and 2) the second step is providing compatible outcrop time series at a shallower depth based on the information from the first step. The comparison of the 5% damped response spectrum from the resulting acceleration time series based on the iterated outcrop motions and the original acceleration time series are conducted. The study showed that the proposed iterative approach produced comparable results within 1% range of the original recorded time series results when sufficient iterations were performed.},
doi = {10.1080/00295450.2018.1507393},
journal = {Nuclear Technology},
number = 4,
volume = 205,
place = {United States},
year = {2018},
month = {8}
}

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Works referenced in this record:

Equivalent linear and nonlinear site response analysis for design and risk assessment of safety-related nuclear structures
journal, August 2014


Use of Exact Solutions of Wave Propagation Problems to Guide Implementation of Nonlinear Seismic Ground Response Analysis Procedures
journal, November 2007


Time-domain soil-structure interaction analysis of nuclear facilities
journal, March 2016


High frequency content in nonlinear soil response: A numerical artifact or a reality?
journal, January 2019

  • Veeraraghavan, Swetha; Spears, Robert E.; Coleman, Justin L.
  • Soil Dynamics and Earthquake Engineering, Vol. 116
  • DOI: 10.1016/j.soildyn.2018.09.044

Empirical Quantification of the Impact of Nonlinear Soil Behavior on Site Response
journal, July 2016

  • Régnier, Julie; Cadet, Héloïse; Bard, Pierre‐Yves
  • Bulletin of the Seismological Society of America, Vol. 106, Issue 4
  • DOI: 10.1785/0120150199