Site Characterization For Probabilistic Ground Shock Predictions
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Site Characterization For Probabilistic Ground Shock Predictions
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Author : John Guy Jackson
language : en
Publisher:
Release Date : 1982
Site Characterization For Probabilistic Ground Shock Predictions written by John Guy Jackson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Blast effect categories.
Site Characterization For Probabilistic Ground Shock Predictions
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Author : J. G Jackson (Jr)
language : en
Publisher:
Release Date : 1982
Site Characterization For Probabilistic Ground Shock Predictions written by J. G Jackson (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
A probabilistic methodology is described for determining the statistical distribution of vertical rattlespace required for MX multiple protective shelters sited within the alluvial valleys of central Nevada and eastern Utah. The approach involves (a) identifying the critical ground motion parameters and the input quantities which dominate their calculation, (b) conducting field and laboratory investigations to define the statistical variation of these quantities within the siting area, and (c) performing ground motion calculations with a probabilistic wave propagation code. Calculations for the high-explosive Dynamic In-Situ Compressibility (DISC) tests conducted in Ralston Valley, Nevada, are used to illustrate the probabilistic methodology.
Observation Informed Methodologies For Site Response Characterization In Probabilistic Seismic Hazard Analysis
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Author : Kioumars Afshari
language : en
Publisher:
Release Date : 2017
Observation Informed Methodologies For Site Response Characterization In Probabilistic Seismic Hazard Analysis written by Kioumars Afshari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
In this dissertation, we study the effects of site response on earthquake ground motions, the uncertainty in site response, and incorporating site response in probabilistic seismic hazard analysis. We introduced a guideline for evaluation of non-ergodic (site-specific) site response using (a) observations from available recorded data at the site, (b) simulations from one-dimensional ground response analysis, or (c) a combination of both. Using non-ergodic site response is expected to be an improvement in comparison to using an ergodic model which is based on the average of a global dataset conditional on site parameters used in ground motion models. The improvement in prediction when using non-ergodic analysis results in the removal of site-to-site variability which is a part of the uncertainty in ground motion prediction. The site-to-site variability is evaluated by partitioning the residuals to different sources of variability. We illustrate application of these procedures for evaluating non-ergodic site response, and use examples to show how the reduction in site response uncertainty results in less hazard for long return periods. We utilize a dataset of recordings from vertical array sites in California in order to study the effectiveness of one-dimensional ground response analysis in predicting site response. We use the California dataset for comparing the performance of linear ground response analysis to similar studies on a dataset from vertical arrays in Japan. We use surface/downhole transfer functions and amplification of pseudo-spectral acceleration to study the site response in vertical arrays. For performing linear site response analysis for the sites, we use three alternatives for small-strain soil damping namely (a) empirical models for laboratory-based soil damping; (b) an empirical model based on shear wave velocity for estimating rock quality factor; and (c) estimating damping using the difference between the spectral decay ( ) at the surface and downhole. The site response transfer functions show a better fit for California sites in comparison to the similar results on Japan. The better fit is due to different geological conditions at California and Japan vertical array sites, as well as the difference in the quality of data for the two regions. We use pseudo-spectral acceleration residuals to study the bias and dispersion of ground response analysis predictions. The results of our study shows geotechnical models for lab-based damping provide unbiased estimates of site response for most spectral periods. In addition, the between- and within-site variability of the residuals do not show a considerable regional between California and Japan vertical arrays. In another part of this dissertation, we develop ground motion models for median and standard deviation of the significant duration of earthquake ground motions from shallow crustal earthquakes in active tectonic regions. The model predicts significant durations for 5-75%, 5-95%, and 20-80% of the normalized Arias intensity, and is developed using NGA-West2 database with M3.0-7.9 events. We select recordings based on the criteria used for developing ground motion models for amplitude parameters as well as a new methodology for excluding recordings affected by noise. The model includes an M-dependent source duration term that also depends on focal mechanism. At small M, the data suggest approximately M-independent source durations that are close to 1 sec. The increase of source durations with M is slower over the range M5 to 7.2-7.4 than for larger magnitudes. We adopt an additive path term with breaks in distance scaling at 10 and 50 km. We include site terms that increase duration for decreasing VS30 and increasing basin depth. Our aleatory variability model captures decreasing between- and within-event standard deviation terms with increasing M. We use the model for validating the duration of ground motion time series produced by simulation routines implemented on the SCEC Broadband Platform. This validation is based on comparisons of median and standard deviation of simulated durations for five California events, and their trends with magnitude and distance, with our model for duration. Some misfits are observed in the median and dispersion of durations from simulated motions and their trend with magnitude and distance. Understanding the source of these misfits can help guide future improvements in the simulation routines.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date :
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Science categories.
A Probabilistic One Dimensional Ground Shock Code For Layered Nonlinear Hysteretic Material
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Author : Behzad Rohani
language : en
Publisher:
Release Date : 1984
A Probabilistic One Dimensional Ground Shock Code For Layered Nonlinear Hysteretic Material written by Behzad Rohani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Blast effect categories.
Long Range Science And Technology Plan Combat Support
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Author :
language : en
Publisher:
Release Date : 1985
Long Range Science And Technology Plan Combat Support written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Military research categories.
Probabilistic Assessments Of The Seismic Stability Of Slopes
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Author : Yubing Wang
language : en
Publisher:
Release Date : 2014
Probabilistic Assessments Of The Seismic Stability Of Slopes written by Yubing Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Earthquake-induced landslides are a significant seismic hazard that can generate large economic losses. Predicting earthquake-induced landslides often involves an assessment of the expected sliding displacement induced by the ground shaking. A deterministic approach is commonly used for this purpose. This approach predicts sliding displacements using the expected ground shaking and the best-estimate slope properties (i.e., soil shear strengths, ground water conditions and thicknesses of sliding blocks), and does not consider the aleatory variability in predictions of ground shaking or sliding displacements or the epistemic uncertainties in the slope properties. In this dissertation, a probabilistic framework for predicting the sliding displacement of flexible sliding masses during earthquakes is developed. This framework computes a displacement hazard curve using: (1) a ground motion hazard curve from a probabilistic seismic hazard analysis, (2) a model for predicting the dynamic response of the sliding mass, (3) a model for predicting the sliding response of the sliding mass, and (4) a logic tree that incorporates the uncertainties in the various input parameters. The developed probabilistic framework for flexible sliding masses is applied to a slope at a site in California. The results of this analysis show that the displacements predicted by the probabilistic approach are larger than the deterministic approach due to the influence of the uncertainties in the slope properties. Reducing these uncertainties can reduce the predicted displacements. Regional maps of seismic landslide potential are used in land-use planning and to identify zones that require detailed, site-specific studies. Current seismic landslide hazard mapping efforts typically utilize deterministic approaches to estimate rigid sliding block displacements and identify potential slope failures. A probabilistic framework that uses displacement hazard curves and logic-tree analysis is developed for regional seismic landslide mapping efforts. A computationally efficient approach is developed that allows the logic-tree approach to be applied for regional analysis. Anchorage, Alaska is used as a study area to apply the developed approach. With aleatory variability and epistemic uncertainties considered, the probabilistic map shows that the area of high/very high hazard of seismic landslides increases by a factor of 3 compared with a deterministic map.
List Of Publications Of The U S Army Engineer Waterways Experiment Station
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Author : U.S. Army Engineer Waterways Experiment Station
language : en
Publisher:
Release Date : 1993
List Of Publications Of The U S Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Coastal engineering categories.
1 D Probabilistic Ground Shock Analysis Of Generic Mountain C
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Author : James B. Wilson
language : en
Publisher:
Release Date : 1992
1 D Probabilistic Ground Shock Analysis Of Generic Mountain C written by James B. Wilson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Blast effect categories.