Nonlinear Time Domain Seismic Soil-Structure Interaction (SSI) Deep Soil Site Methodology Development

Spears, Robert E.; Coleman, Justin

doi:10.2172/1371516

Cited by 9 publications

(17 citation statements)

References 5 publications

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“…Idaho National Laboratory (INL) is currently performing research and development to develop a nonlinear soil-structure interaction (NLSSI) methodology for application to nuclear facilities (Spears and Coleman 2014). This methodology is a series of steps that an analyst or reviewer can follow to perform a fully nonlinear SSI analysis in the time domain including 1) nonlinear site response, 2) nonlinear hysteretic soil behavior at the foundation vicinity, 3) geometric nonlinearities at the foundation including gapping and sliding and 4) nonlinear behavior of the structure such as concrete cracking.…”

Section: A Methodology For Time-domain Ssi Analysismentioning

confidence: 99%

“…In these studies, Anderson, Elkhoraibi et al (2013) compared the results from SAP2000 (Computers and Structures Inc. 2011) to those from SASSI2010 (Ostadan and Deng 2011), while Coronado, Anderson et al (2013) compared the results from the extended subtraction method in SASSI2010 to those calculated using the commercial finite-element code ANSYS (ANSYS Inc. 2013). Spears and Coleman (2014), in a comprehensive study, developed a methodology for nonlinear SSI analysis in the time domain, compared the SSI responses calculated using SASSI and timedomain codes, and identified some issues regarding the usage of these codes. A similar study was performed by and , which involved benchmarking time-domain SSI analysis in LS-DYNA against SASSI2000, performing detailed comparisons between the SASSI2000 and LS-DYNA results for highly nonlinear cases and identifying potential practical issues in performing SSI analysis using these programs.…”

Section: Literature Reviewmentioning

confidence: 99%

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Time-domain soil-structure interaction analysis of nuclear facilities

Coleman

Bolisetti

Whittaker

2016

Nuclear Engineering and Design

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The Nuclear Regulatory Commission (NRC) regulation 10 CFR Part 50 Appendix S requires consideration of soil-structure interaction (SSI) in nuclear power plant (NPP) analysis and design. Soil-structure interaction analysis for NPPs is routinely carried out using guidance provided in the ASCE Standard 4 titled "Seismic Analysis of Safety-Related Nuclear Structures and Commentary (ASCE-4, 1998)". This document, which is currently under revision, provides detailed guidance on linear seismic soil-structure-interaction (SSI) analysis of nuclear facilities using deterministic and probabilistic methods. However, a new appendix is being added to the revised version of ASCE Standard 4 (ASCE-4, 2015) to provide guidance for time-domain nonlinear SSI (NLSSI) analysis. Nonlinear SSI analysis will be needed to simulate the following behaviors: material nonlinearity (in soil and/or structure), rocking or sliding of the foundation, static and dynamic soil pressure effects on deeply embedded structures, local soil failure at the foundation-soil interface, nonlinear coupling of soil and pore fluid, nonlinear effects of gaps between the surrounding soil and the embedded structure and seismic isolation systems. ASCE-4 2015 Appendix B provides general criteria to consider while performing NLSSI analysis, but lacks a methodology for performing the analysis. This paper provides a description of the NLSSI methodology developed for application at nuclear facilities, including NPPs. This methodology is described as series of steps to be followed to produce reasonable results. These steps require some numerical capabilities, such as nonlinear soil constitutive models, which are also described in the paper.

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Section: A Methodology For Time-domain Ssi Analysismentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Time-domain soil-structure interaction analysis of nuclear facilities

Coleman

Bolisetti

Whittaker

2016

Nuclear Engineering and Design

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“…Soil-structure interaction in a time domain code is performed using the direct method Spears and Coleman, 2014). In the direct method, the whole soilstructure system is analyzed in a single step thereby circumventing the use of superposition, which is extensively used in traditional SSI analysis methods (including SASSI and CLASSI) and is restricted to linear analyses.…”

Section: Modelingmentioning

confidence: 99%

Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling

Bolisetti

Coleman

2015

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The goal of this effort is to compare the seismic core damage frequency obtained by a traditional nuclear power plant seismic probabilistic risk assessment (SPRA) and an advanced SPRA that utilizes Nonlinear Soil-Structure Interaction (NLSSI) analysis. Soil-structure interaction (SSI) response analysis for a traditional SPRA uses linear geometric properties (soil and structure are glued together i.e. soil takes tension when structure uplifts), linear soil properties, and linear structure properties. The NLSSI analysis will consider geometric nonlinearities.

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“…These documents, like the Idaho National Laboratory (INL) methodology (Spears and Coleman, 2014) and the forthcoming Appendix B of the new version of the ASCE 4 Standard (American Society of Civil Engineers (ASCE), 2015) take a significant step further by introducing new concepts, approaches and tools. However, the nature of these provisions is still nonmandatory.…”

Section: Introductionmentioning

confidence: 99%

Seismically induced uplift effects on nuclear power plants. Part 1: Containment building rocking spectra

Sextos

Manolis

Athanasiou

et al. 2017

Nuclear Engineering and Design

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. focusing primarily on the response of the containment structure of a nuclear power plant.However, in current state-of-practice and in most seismic regulations worldwide, the consideration of soil-structure interaction and potential development of geometrically nonlinear effects, such as rocking and sliding with uplift, is not taken into consideration. To explore this issue, a refined 3Dfinite element model of a typical nuclear power plant containment structure is developed, comprising solid elements for the soil and foundation, plus shell elements for the structure. The aim is identification of foundation-soil separation phenomena under a suite of ground motions with distinct frequency content. At first, harmonic excitations are used, for both cases of stiff sand and rock subsoil profiles, leading to rocking spectra that depict the displacement demand in connection with nonlinear separation. Clear influence zones can be distinguished, especially in the low frequency bands for the stiff sand case. Next, three subsets of 30 ground motion records are carefully selected and grouped in ensembles according to their frequency content, normalized to a PGA of 0.36g, which corresponds to the highest design acceleration in Europe. Ground motions with low mean frequency content are observed to lead to the onset of geometrically nonlinear phenomena, along with a higher displacement demand. The interplay between ground motion characteristics, dynamic properties of the containment structure and stiffness of the soil is also highlighted. More specifically, it is shown that stiff containment structures on soft soils are more prone to foundation uplift. This possibility is often neglected in design codes and the consequence is that under certain circumstances, damage may be caused to the internal power generation equipment..

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Nonlinear Time Domain Seismic Soil-Structure Interaction (SSI) Deep Soil Site Methodology Development

Cited by 9 publications

References 5 publications

Time-domain soil-structure interaction analysis of nuclear facilities

Time-domain soil-structure interaction analysis of nuclear facilities

Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling

Seismically induced uplift effects on nuclear power plants. Part 1: Containment building rocking spectra

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