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University of Washington

1. Chen, Long. Implementation, Verification, Validation, and Application of Two Constitutive Models for Earthquake Engineering Applications.

Degree: PhD, 2021, University of Washington

Human and economic losses caused by earthquake-induced soil liquefaction underscore the importance of assessing liquefaction hazards, both by determining whether a soil is likely to liquefy and by estimating consequences that these events may cause. Numerical simulations have proven to be useful for these purposes. Reliable numerical analysis requires constitutive models to represent the in-situ soil behavior as well as general loading and drainage conditions. In this context, the main objective of this research is to implement, verify, and validate two newly developed constitutive models, PM4Sand and PM4Silt (Boulanger and Ziotopoulou, 2017, 2018), in the finite element platform OpenSees (OpenSees, 2007). These models are developed for earthquake engineering applications and can achieve reasonable approximations of desired behavior including pore pressure generation and dissipation, limiting strains, and cyclic mobility with straightforward calibration process. The verification study compares the response of the same model implemented in three different frameworks, OpenSees, FLAC, and PLAXIS, using stress point, element model, and 1D analyses. The validation study demonstrates the models’ capability in capturing realistic soil behavior under different scenarios including case-histories and a large-scale shake table test. For further validation of PM4Sand, the second part of this dissertation concentrates on the contribution of the UW numerical simulation team to three recent LEAP workshops that have focused on validating constitutive models using high quality laboratory and centrifuge experiments. The simulated models include a constant slope subject to lateral spreading and a sheet pile retaining structure supporting liquefiable soils. Lastly, this dissertation addresses two case studies using PM4Sand and PM4Silt to shed light on their application for analyzing lateral spreading induced by liquefaction. The first case focuses on a typical highway bridge embankment and investigates the efficiency of different intensity measures for estimating lateral displacement. The second case focuses on a real case study that showed zero-displacement lateral spreading during a recent earthquake event due, possibly, to interbedded sand, silt, and clay deposits. Advisors/Committee Members: Arduino, Pedro (advisor).

Subjects/Keywords: Constitutive model; Dynamic analysis; Finite element analysis; Lateral spreading; Liquefaction; Civil engineering; Civil engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, L. (2021). Implementation, Verification, Validation, and Application of Two Constitutive Models for Earthquake Engineering Applications. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/46758

Chicago Manual of Style (16th Edition):

Chen, Long. “Implementation, Verification, Validation, and Application of Two Constitutive Models for Earthquake Engineering Applications.” 2021. Doctoral Dissertation, University of Washington. Accessed April 22, 2021. http://hdl.handle.net/1773/46758.

MLA Handbook (7th Edition):

Chen, Long. “Implementation, Verification, Validation, and Application of Two Constitutive Models for Earthquake Engineering Applications.” 2021. Web. 22 Apr 2021.

Vancouver:

Chen L. Implementation, Verification, Validation, and Application of Two Constitutive Models for Earthquake Engineering Applications. [Internet] [Doctoral dissertation]. University of Washington; 2021. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/1773/46758.

Council of Science Editors:

Chen L. Implementation, Verification, Validation, and Application of Two Constitutive Models for Earthquake Engineering Applications. [Doctoral Dissertation]. University of Washington; 2021. Available from: http://hdl.handle.net/1773/46758

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