Modelling the variability in seismically induced slope displacements due to ground motion selection

Download

index.pdf

Date

2019

Author

Özmen, Burak Oka

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

225
views

155
downloads

Assessing the earthquake performance of a slope and estimating the seismically-induced slope displacements is one of the most complicated tasks in geotechnical earthquake engineering. The source of the complication includes: i) defining the soil properties and their variability within the limits of the available geological/geotechnical information, and ii) executing a proper ground motion selection and scaling procedure for the dynamic numerical analysis, which are generally limited in number for most of the engineering applications. The objective of this study is to model the uncertainty due to ground motion selection in the seismically-induced soil slope displacements estimated by the dynamic numerical analysis. For this purpose, fifty horizontal pairs of ground motions recorded at rock stations from the Pacific Earthquake Engineering Research Center database are selected and scaled up to 1.0g of maximum horizontal acceleration to create the candidate ground motion dataset of 300 recordings. These recordings are utilized in PLAXIS-2D software to perform the dynamic numerical analysis for eight different slopes in dry (drained) soil. Analysis results showed that the standard deviation of a simplified prediction model for seismically-induced permanent slope displacements lie within the range of 0.28-0.36 (log units) and does not show a significant variation with factor of safety in static conditions or angle of the slope geometry. At the end of the study, 18 ground motion components that represent the median behaviour are selected and provided for the future studies. These recordings may be preferred in the numerical dynamic analysis to examine slope displacements and when combined with the estimated standard deviations, the body and the range in seismic demand models for earthquake-induced slope displacements may be properly modelled.

Subject Keywords

Slopes (Soil mechanics)., Seismically-induced slope displacements, dynamic finite element analysis, ground motion selection and scaling, seismic demand models.

URI

http://etd.lib.metu.edu.tr/upload/12623183/index.pdf
https://hdl.handle.net/11511/43352

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Multi-Mode Pushover Analysis with Generalized Force Vectors Sucuoğlu, Haluk (2009-07-01) A generalized pushover analysis procedure is developed for estimating the inelastic seismic response of structures under earthquake ground excitations. The procedure comprises applying a generalized force vector to the structure in an incremental form with increasing amplitude until a prescribed seismic demand is attained. A generalized force vector is expressed as a combination of modal forces, and simulates the instantaneous force distribution acting on the system when a given interstory drift reaches its...
Probabilistic seismic hazard assessment for sliding displacement of slopes: an application in Turkey Gülerce, Zeynep (2017-07-01) Earthquake-induced slope instability is one of the major sources of earthquake hazards in near fault regions. Simplified tools such as Newmark's sliding block (NSB) analysis are widely used to estimate the sliding displacement of slopes during earthquake shaking. Additionally, empirical models for predicting NSB displacement using single or multiple ground motion intensity measures based on global (e.g. NGA-W1 database, Chiou et al. 2008) or regional datasets are available. The objective of this study is to...
Application of recent optimization algorithms on slope stability problems Azizi, Sadra; Pekcan, Onur; Department of Civil Engineering (2018) Stability analysis of earth slopes in general involves determining the minimum factor of safety (FS) associated with the most critical failure surface. This objective is too challenging to accomplish considering the broad diversity of slope problems in geometry, geotechnical parameters of the soil, location of the groundwater table, and condition of the external loadings. Robust optimization techniques, however, have recently performed well in determining safety factors of various man-made and natural slope...
Hydrodynamic Modeling of Dam-Reservoir Response during Earthquakes Aydın, İsmail (American Society of Civil Engineers (ASCE), 2011-08-03) A computational model is developed to analyze the hydrodynamic behavior of dam reservoirs during earthquakes. The mathematical model is based on the solution of two-dimensional (2D) Navier-Stokes equations in a vertical, semi-infinite domain truncated by a far-end boundary condition. A depth integrated continuity equation is used to track the deforming free-surface and ensure global mass conservation. A combination of Sommerfeld nonreflecting boundary and dissipation zone methods is implemented at the far e...
Predicting seismic damage on concrete gravity dams: a review Arıcı, Yalın; Soysal, Berat Feyza (2022-01-01) The seismic assessment of concrete gravity dams is a problem of prediction of cracking and the corresponding consequences. With the widespread use of general-purpose finite element programs, the work in the field has shifted towards quantifying the behaviour in a framework for assessment. The nonlinear analysis and coupling with foundation–reservoir interaction, conversely, is still a challenging task. The modelling approach has significant effects on the analysis results and the assessment framework. The f...

Citation Formats

B. O. Özmen, “Modelling the variability in seismically induced slope displacements due to ground motion selection,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.