Download or read book Site Effects Study in the Mississippi Embayment and Uncertainties Evaluation in Site Response Analysis written by Arash Yarahmadi and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The local site conditions have paramount influence on the characteristics of seismic ground shaking. There are several methods of investigating seismic site effects which can be classified into two major categories; common site-specific response analysis, and procedures that use solely earthquake time series like the Standard Spectral Ratio (SSR), and Horizontal to Vertical Ratio (HVSR) methods. In the SSR method, the spectral ratios of earthquake records at a certain station can be evaluated with respect to a reference station located on a nearby outcrop rock. In the first part of the dissertation, we use earthquake records to find reference stations and use that reference station to find the site amplifications at the target stations inside the Mississippi Embayment (ME). We found WHAR, W41B, and UALR seismic stations, which have reference stations characteristics, close to the ME using horizontal-to-vertical spectrum ratio (HVSR) method. Amplification factors are obtained for six target stations inside the ME using an inversion method with WHAR seismic station as the reference station. Thirty-five local and regional earthquakes in the New Madrid and Arkansas seismic zones are used to perform the inversion. The results show the fundamental frequencies of these stations are as low as 0.2 HZ to 1 HZ, which corresponds to the soft features of their local conditions. In the second part of this dissertation, we focus on finding uncertainties in the 1-D equivalent linear site response analysis (SRA). In SRA these uncertainties are accounted for by generating random cases of soil parameters. Choosing suitable randomization bounds can decrease the effects of the uncertainties in soil parameters on SRA results like predicted spectral accelerations. These bounds quantified by the coefficient of variation (COV), which can be defined for different soil parameters. Using Vertical seismometer arrays, we can compare predicted and observed surface ground motions. In this study we evaluate COVs for different parameters of the soil that are the main input parameters of equivalent linear SRA. Coefficients of variation which generate minimum root means square errors of the observed and predicted response spectra are obtained for different site classes..
Download or read book Probabilistic Seismic Hazard Analysis of the Mississippi Embayment Incorporating Nonlinear Site Effects written by Mahesh Singh Dhar and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mississippi Embayment (ME) area is prone to damaging earthquakes as it lies over the New Madrid Seismic Zone, which is considered the most seismically active zone in the central and eastern United States. Several attempts have been made to account for the influence of deep sediment deposits of the ME on the propagation of seismic waves. This study presents the seismic and liquefaction hazards of the ME by adding the local geologic conditions to the 2014 USGS National Seismic Hazard Model. Both equivalent linear and nonlinear site response codes have been used to determine the amplification distribution at a site. This study uses the most up-to-date information available from different researchers and attempts to reduce the effect of uncertainties. A new 3D geologic model has been generated to assign geologic information and shear wave velocity to the soil profiles distributed over the ME area. The 3D model helps to generate an interpolated soil profile at a site for more accurate site response analysis, replacing the use of generic soil profiles. For liquefaction hazard analysis, updated surface geologic maps and liquefaction potential curves have been used. At short periods corresponding to peak ground acceleration the results show that seismic hazard is reduced on the lowlands in comparison to USGS results, mainly due to deamplification of ground motions from strong nonlinearity in the softer soil deposits. The NOAH (nonlinear Iwan model) site response code shows slightly lower hazard on the lowland soils in comparison to those obtained from SHAKE91 (equivalent linear). At long periods, lowlands deposits amplify hazards more in comparison to corresponding USGS results, mainly due to much less soil nonlinearity at long periods. The liquefaction hazard tends to be high in Holocene and late Pleistocene lowlands sediments and low in Pleistocene loess of the uplands. The young sediments and shallow groundwater table depth in lowlands contribute to higher liquefaction hazard. Considering pore pressure effects in nonlinear site response analysis at a test site on the lowlands shows amplification of ground motion even at short periods. Therefore, pore pressure effects should be considered in seismic hazard analysis of the ME. .
Download or read book Latest Developments in Geotechnical Earthquake Engineering and Soil Dynamics written by T.G. Sitharam and published by Springer Nature. This book was released on 2021-07-01 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume brings together contributions from world renowned researchers and practitioners in the field of geotechnical engineering. The chapters of this book are based on the keynote and invited lectures delivered at the 7th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. The book presents advances in the field of soil dynamics and geotechnical earthquake engineering. A strong emphasis is placed on proving connections between academic research and field practice, with many examples, case studies, best practices, and discussions on performance-based design. This volume will be of interest to research scholars, academicians and industry professionals alike.
Download or read book Practices and Procedures for Site Specific Evaluations of Earthquake Ground Motions written by Neven Matasovic and published by Transportation Research Board National Research. This book was released on 2012 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 428: Practices and Procedures for Site-Specific Evaluations of Earthquake Ground Motions identifies and describes current practice and available methods for evaluating the influence of local ground conditions on earthquake design ground motions on a site-specific basis.
Download or read book Earthquake Engineering and Structural Dynamics in Memory of Ragnar Sigbj rnsson written by Rajesh Rupakhety and published by Springer. This book was released on 2017-12-07 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents methods and results that cover and extend beyond the state-of-the-art in structural dynamics and earthquake engineering. Most of the chapters are based on the keynote lectures at the International Conference in Earthquake Engineering and Structural Dynamics (ICESD), held in Reykjavik, Iceland, on June 12-14, 2017. The conference is being organised in memory of late Professor Ragnar Sigbjörnsson, who was an influential teacher and one of the leading researchers in the fields of structural mechanics, random fields, engineering seismology and earthquake engineering. Professor Sigbjörnsson had a close research collaboration with the Norwegian Institute of Science and Technology (NTNU), where his research was mainly focused in dynamics of marine and offshore structures. His research in Iceland was mainly focused on engineering seismology and earthquake engineering. The keynote-lecture based chapters are contributed by leading experts in these fields of research and showcase not only the historical perspective but also the most recent developments as well as a glimpse into the future. These chapters showcase a synergy of the fields of structural dynamics, engineering seismology, and earthquake engineering. In addition, some chapters in the book are based on works carried out under the leadership and initiative of Professor Sigbjörnsson and showcase his contribution to the understanding of seismic hazard and risk in Iceland. As such, the book is useful for both researchers and practicing engineers who are interested in recent research advances in structural dynamics and earthquake engineering, and in particular to those interested in seismic hazard and risk in Iceland.
Download or read book Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions written by Francesco Silvestri and published by CRC Press. This book was released on 2019-07-19 with total page 8083 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismological Research Letters written by and published by . This book was released on 2006 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Methods in Earthquake Engineering written by Manolis Papadrakakis and published by Springer Science & Business Media. This book was released on 2010-12-06 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an insight in advanced methods and concepts for structural analysis and design against seismic loading. The book consists of 25 chapters dealing with a wide range of timely issues in contemporary Earthquake Engineering. In brief, the topics covered are: collapse assessment, record selection, effect of soil conditions, problems in seismic design, protection of monuments, earth dam structures and liquid containers, numerical methods, lifetime assessment, post-earthquake measures. A common ground of understanding is provided between the communities of Earth Sciences and Computational Mechanics towards mitigating seismic risk. The topic is of great social and scientific interest, due to the large number of scientists and practicing engineers currently working in the field and due to the great social and economic consequences of earthquakes.
Download or read book Earthquake Geotechnical Engineering Design written by Michele Maugeri and published by Springer Science & Business Media. This book was released on 2014-02-03 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pseudo-static analysis is still the most-used method to assess the stability of geotechnical systems that are exposed to earthquake forces. However, this method does not provide any information about the deformations and permanent displacements induced by seismic activity. Moreover, it is questionable to use this approach when geotechnical systems are affected by frequent and rare seismic events. Incidentally, the peak ground acceleration has increased from 0.2-0.3 g in the seventies to the current value of 0.6-0.8 g. Therefore, a shift from the pseudo-static approach to performance-based analysis is needed. Over the past five years considerable progress has been made in Earthquake Geotechnical Engineering Design (EGED). The most recent advances are presented in this book in 6 parts. The evaluation of the site amplification is covered in Part I of the book. In Part II the evaluation of the soil foundation stability against natural slope failure and liquefaction is treated. In the following 3 Parts of the book the EGED for different geotechnical systems is presented as follows: the design of levees and dams including natural slopes in Part III; the design of foundations and soil structure interaction analysis in Part IV; underground structures in Part V. Finally in Part VI, new topics like the design of reinforced earth retaining walls and landfills are covered.
Download or read book Estimation of Non Linear Seismic Site Effects for Deep Deposits of the Mississippi Embayment written by Duhee Park and published by . This book was released on 2003 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lifeline Earthquake Engineering written by and published by . This book was released on 1991 with total page 1240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Ground Response Analysis written by Nozomu Yoshida and published by Springer. This book was released on 2014-11-17 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents state-of-the-art information on seismic ground response analysis, and is not only very valuable and useful for practitioners but also for researchers. The topics covered are related to the stages of analysis: 1. Input parameter selection, by reviewing the in-situ and laboratory tests used to determine dynamic soil properties as well as the methods to compile and model the dynamic soil properties from literature;2. Input ground motion; 3. Theoretical background on the equations of motion and methods for solving them; 4. The mechanism of damping and how this is modeled in the equations of motions; 5. Detailed analysis and discussion of results of selected case studies which provide valuable information on the problem of seismic ground response analysis from both a theoretical and practical point of view.
Download or read book Geophysical Characterization of Sites written by Richard D. Woods and published by Science Publishers. This book was released on 1994 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Publications of the U S Geological Survey written by and published by . This book was released on 1984 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 100th Anniversary Earthquake Conference written by and published by . This book was released on 2006 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1984 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:
