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Comparison Between Newmark Time History Analysis and Finite Element Method for Estimating Seismically Induced Slope Displacement
Estimating the seismically induced slope displacement is important in assessing the stability and relative deformation of slopes during earthquakes. The Newmark time history analysis (also known as Newmark displacement analysis) bridges the gap between the simplified pseudo-static method and complex stress-deformation analysis such as finite element (FE) analysis. However, the Newmark time history analysis may result in smaller dynamic deformation estimates. There is a lack of guidance on if the same deformation performance criterion should be applied to all methods. The study is divided into three parts: First, a two-dimensional stability analysis of the study slope was carried out for static and pseudo-static loading conditions per the relevant standard guidelines. Slope deformation was estimated for the pseudo-static loading condition using the simplified, empirical Bray and Macedo’s (2019) method for horizontal vibrations and shallow crustal earthquakes. Then, Newmark displacement of the slope along its most probable failure surface was estimated for selected earthquake time histories using the SLAMMER code built into the Slide2 software. Both coupled/decoupled acceleration time history methods were carried out. In the final part, finite element analysis was conducted for the same slope using the same earthquake time histories. Comparison of slope displacements at the crest from these three methods show that seismically induced displacements estimated using the Newmark time history analysis can be smaller than those from the FE analysis. Recommendations for building case study pools and developing method-dependent performance criteria are also included.
Comparison Between Newmark Time History Analysis and Finite Element Method for Estimating Seismically Induced Slope Displacement
Estimating the seismically induced slope displacement is important in assessing the stability and relative deformation of slopes during earthquakes. The Newmark time history analysis (also known as Newmark displacement analysis) bridges the gap between the simplified pseudo-static method and complex stress-deformation analysis such as finite element (FE) analysis. However, the Newmark time history analysis may result in smaller dynamic deformation estimates. There is a lack of guidance on if the same deformation performance criterion should be applied to all methods. The study is divided into three parts: First, a two-dimensional stability analysis of the study slope was carried out for static and pseudo-static loading conditions per the relevant standard guidelines. Slope deformation was estimated for the pseudo-static loading condition using the simplified, empirical Bray and Macedo’s (2019) method for horizontal vibrations and shallow crustal earthquakes. Then, Newmark displacement of the slope along its most probable failure surface was estimated for selected earthquake time histories using the SLAMMER code built into the Slide2 software. Both coupled/decoupled acceleration time history methods were carried out. In the final part, finite element analysis was conducted for the same slope using the same earthquake time histories. Comparison of slope displacements at the crest from these three methods show that seismically induced displacements estimated using the Newmark time history analysis can be smaller than those from the FE analysis. Recommendations for building case study pools and developing method-dependent performance criteria are also included.
Comparison Between Newmark Time History Analysis and Finite Element Method for Estimating Seismically Induced Slope Displacement
Atlantis Highlights in Engineering
Javankhoshdel, Sina (editor) / Abolfazlzadeh, Yousef (editor) / Badanagki, Mahir (author) / Li, Feng (author) / Armstrong, Christian (author)
TVSeminars and Mining One International Conference ; 2022 ; Toronto, ON, Canada
Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022) ; Chapter: 16 ; 171-178
2023-02-26
8 pages
Article/Chapter (Book)
Electronic Resource
English
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