Author: Robert B. HerrmannPublisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 28
Book Description
Comparative Ground Motion Studies
Author: Robert B. HerrmannPublisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 28
Book Description
The Sufficiency of Sinusoidal Motions in Seismic Ground Motion Studies
Author: Bryon W. BoycePublisher:
ISBN:
Category : Soil-structure interaction
Languages : en
Pages : 270
Book Description
A Comparative Study of Structural Response to Explosion-induced Ground Motions ...
Author: ASCE Research Council on Performance of StructuresPublisher:
ISBN:
Category : Blast effect
Languages : en
Pages : 158
Book Description
Ground Motion Variability and Its Effect on the Probabilistic Seismic Hazard Analysis
Author: Vasily PavlenkoPublisher:
ISBN:
Category : Earthquake resistant design
Languages : en
Pages : 83
Book Description
The majority of injuries and casualties during earthquakes occur as a result of partial or complete collapse of buildings. The assessment of possible seismic ground motions for the purposes of earthquake-resistant design can be performed by following the deterministic or probabilistic methodology. Chapter 1 presents an overview of the current practice in seismic hazard analysis with emphasis on PSHA. At present, the Cornell-McGuire method prevails in PSHA studies. Despite significant development and modifications, this method has several controversial aspects. Absence of an upper bound of the seismic hazard curve is one of the most disputable aspects of the method, as it leads to unrealistic ground motion estimates for very low probabilities of exceedance. This problem stems from using the unbounded log-normal distribution in the modelling of the ground motion variability. The main objective of the study was to investigate this variability and suggest a more realistic probability distribution which would allow accounting for the finiteness of the ground motion induced by earthquake. Chapter 2 introduces the procedure that is suitable for studying the ground motion variability. Given the data sample, this procedure allows selecting the most plausible probability distribution from a set of candidate models. Chapter 3 demonstrates the application of this procedure to PGA data recorded in Japan. This analysis demonstrated the superiority of the GEVD in the vast majority of considered examples. Estimates of the shape parameter of the GEVD were negative in every considered example, indicating the presence of a finite upper bound of PGA. Therefore, the GEVD provides a model that is more realistic for the scatter of the logarithm of PGA, and the application of this model leads to a bounded seismic hazard curve. In connection with a revival of interest in seismic intensity as an analogue for physical ground motion parameters, the problem of accounting for anisotropy in the attenuation of MMI is considered in Chapter 4. A set of four equations that could account for this anisotropy was proposed and the applicability of these equations was demonstrated by modelling the isoseismal maps of two well-recorded seismic events that have occurred in South Africa. The results demonstrated that, in general, the new equations were superior to the isotropic attenuation equation, especially as regards to the pronounced anisotropy. As several different PSHA methods exist, it is important to know how the results of application of these methods corresponded to each other. Chapter 5 presents the comparative study of three major PSHA methods, namely, the Cornell-McGuire method, the Parametric-Historic method, and the method based on Monte Carlo simulations. Two regions in Russia were selected for comparison, and the PGA estimates were compared for return periods of 475 and 2475 years. The results indicated that the choice of a particular method for conducting PSHA has relatively little effect on the hazard estimates when the same seismic source model was used in the calculations. The considered PSHA methods would provide closely related results for areas of moderate seismic activity; however, the difference among the results would apparently increase with increasing seismic activity.
Earthquake Source Asymmetry, Structural Media and Rotation Effects
Author: Roman TeisseyrePublisher: Springer Science & Business Media
ISBN: 3540313370
Category : Science
Languages : en
Pages : 582
Book Description
This breakthrough book is the first to examine the rotational effects in earthquakes, a revolutionary concept in seismology. Existing models do no yet explain the significant rotational and twisting motions that occur during an earthquake and cause the failure of structures. The rotation and twist effects are investigated and described, and their consequences for designing tall buildings and other important structures are presented. This book will change the way the world views earthquakes.
Studies for Seismic Zonation of the San Francisco Bay Region
Author: R. D. BorcherdtPublisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 116
Book Description
Ground Motion Studies
Author: Weston Geophysical Research, IncPublisher:
ISBN:
Category : Earth movements
Languages : en
Pages : 90
Book Description
Comparison of Nonlinear Model Results Using Modified Recorded and Synthetic Ground Motions
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A study has been performed that compares results of nonlinear model runs using two sets of earthquake ground motion time histories that have been modified to fit the same design response spectra. The time histories include applicable modified recorded earthquake ground motion time histories and synthetic ground motion time histories. The modified recorded earthquake ground motion time histories are modified from time history records that are selected based on consistent magnitude and distance. The synthetic ground motion time histories are generated using appropriate Fourier amplitude spectrums, Arias intensity, and drift correction. All of the time history modification is performed using the same algorithm to fit the design response spectra. The study provides data to demonstrate that properly managed synthetic ground motion time histories are reasonable for use in nonlinear seismic analysis.
Free-field Code Predictions Versus Field Measurements
Author: Joseph Simon ZelaskoPublisher:
ISBN:
Category : Blast effect
Languages : en
Pages : 78
Book Description
The report documents the results of an airblast-induced ground-shock calculation performed at the U.S. Army Engineer Waterways Experiment Station (WES) for the Operation Prairie Flat 500-ton high-explosive (HE) event. A WES-modified version of the 2D axisymmetric LAYER Code developed by the Paul Weidlinger firm was used for the investigation. Each layer of the soil profile was mathematically modeled with a nonlinear elastic-plastic-compacting type constitutive model that provided good fits to the available material property test data. Field airblast measurements were used to develop an airblast routine suitable for code input. The code results, carried to 300 msec of real time, showed good quantitative and qualitative agreement with the field ground-motion measurements in regions outside the crater zone. The calculations reported herein represent initial efforts at WES to conduct comprehensive parametric studies of the effectiveness of contemporary mathematical constitutive models in predicting airblast-induced ground motions for several high-explosive field tests. The overall research program includes study of the influences of computational details such as boundary conditions, grid size, and time step and comparative analyses of the calculated ground motions and those recorded during the field test events. (Author).
Author: