Download or read book Centrifuge Modeling for Soil pile bridge Systems with Numerical Simulations Accounting for Soil container shaker Interaction written by Mahadevan Ilankatharan and published by . This book was released on 2008 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading written by Mourad Zeghal and published by . This book was released on 2020-10-09 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book presents work collected through the Liquefaction Experiments and Analysis Projects (LEAP) in 2017. It addresses the repeatability, variability, and sensitivity of lateral spreading observed in twenty-four centrifuge model tests on mildly sloping liquefiable sand. The centrifuge tests were conducted at nine different centrifuge facilities around the world. For the first time, a sufficient number of experiments were conducted to enable assessment of variability of centrifuge test results. The experimental data provided a unique basis for assessing the capabilities of twelve different simulation platforms for numerical simulation of soil liquefaction. The results of the experiments and the numerical simulations are presented and discussed in papers submitted by the project participants. The work presented in this book was followed by LEAP-Asia that included assessment of a generalized scaling law and culminated in a workshop in Osaka, Japan in March 2019. LEAP-2020, ongoing at the time of printing, is addressing the validation of soil-structure interaction analyses of retaining walls involving a liquefiable soil. A workshop is planned at RPI, USA in 2020. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

Download or read book Constitutive and Numerical Modeling of Soil and Soil pile Interaction for 3D Applications written by Shentang Wang and published by . This book was released on 2006 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geotechnical Centrifuge Technology written by R.N. Taylor and published by CRC Press. This book was released on 2003-09-02 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a thorough review of this powerful and sophisticated technique for modelling soil structure interactions. It has been written by an international team of authors.

Download or read book Three Dimensional Modeling of Ground Pile Systems and Bridge Foundations written by Ning Wang and published by . This book was released on 2015 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continued advancements in high-speed computing and increased availability of earthquake strong motion data have been allowing for further progress in the area of soil-structure-interaction (SSI). Efforts in this dissertation are mainly concerned with three-dimensional (3D) computational analyses of pile foundations and bridge-foundation-ground systems. This includes Finite Element (FE) modeling of ground-pile foundation systems, documentation and assessment of recorded bridge strong motion data, and identification of dynamic bridge-foundation system characteristics. Currently, simplified approaches, such as p-y curves or the foundation stiffness matrix representation, are employed mainly when considering Soil-Structure-Interaction. However, there is much interest in more representative modeling techniques in order to improve our assessments of seismic pile foundation response. In an effort to address this challenge, 3D FE numerical investigations are conducted related to the response of piles and pile groups under lateral load. Distribution of loads and moments among the piles within the group is investigated. Effects of permeability and loading rate on lateral pile response are addressed for saturated relatively impervious cohesionless soil condition. Insights concerning the soil-pile interaction mechanisms are obtained based on the conducted analyses of the soil-pile foundation subsystems. Furthermore, numerical studies are conducted of long-span highway bridge-foundation systems under seismic loading conditions. Three-dimensional FE models of two existing bridges at Eureka California (the Samoa Channel Bridge and the Eureka Channel Bridge) are developed. Methodologies combining numerical modeling with insights gained from strong motion sensor records are investigated to capture the essential structure-foundation-ground system-response mechanisms. Focus is placed on the evaluation of dynamic properties and validation of the bridge FE models based on the recorded earthquake response. An optimization tool (SNOPT) is employed to evaluate the bridge foundation lateral stiffness. The studies show that computational modeling, along with analysis of the recorded ground-pile foundation data, provide an effective mechanism for understanding the entire structure-foundation-ground system response. The OpenSees platform and the user-interfaces OpenSeesPL, MSBridge, as well as SNOPT are employed in various sections of the study. In the domain of highly expensive and time consuming foundation design and/or retrofit, major beneficial outcomes can result from adoption of analysis tools which have been calibrated/verified by actual recorded seismic performance data sets.

Download or read book Centrifuge Modeling of Oblique Pipe soil Interaction in Dense and Loose Sand written by Pijush Debnath and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to relative ground movement, buried pipelines experience geotechnical loads. The imposed geotechnical loads may initiate pipeline deformations that affect system serviceability and integrity. Engineering guidelines (e.g., ALA, 2005; Honegger and Nyman, 2001) provide the technical framework to develop idealized structural models to analyze pipe-soil interaction events and assess pipe mechanical response. The soil behavior is modeled using discrete springs that represent the geotechnical loads per unit pipe length developed during the interaction event. Soil forces are defined along three orthogonal directions (i.e., axial, lateral and vertical) to analyze the response of pipelines. Nonlinear load-displacement relationships of soil defined by a spring, is independent of neighboring spring elements. However, recent experimental and numerical studies demonstrate significant coupling effects during oblique (i.e., not along one of the orthogonal axes) pipe-soil interaction events. In the present study, physical modeling using a geotechnical centrifuge was conducted to improve the current understanding of soil load coupling effects of buried pipes in loose and dense sand. A section of pipeline, at shallow burial depth, was translated through the soil at different oblique angles in the axial-lateral plane. The force exerted by the soil on pipe is critically examined to assess the significance of load coupling effects and establish a yield envelope. The displacements required to soil yield force are also examined to assess potential coupling in mobilization distance. A set of laboratory tests were conducted on the sand used for centrifuge modeling to find the stress-strain behavior of sand, which was used to examine the possible mechanisms of centrifuge model test. The yield envelope, deformation patterns, and interpreted failure mechanisms obtained from centrifuge modeling are compared with other physical modeling and numerical simulations available in the literature.

Download or read book Centrifuge Model Testing of Soils written by Mosaid M. Al-Hussaini and published by . This book was released on 1976 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Centrifuge Modeling of Permeability and Pinning Reinforcement Effects on Pile Response to Lateral Spreading written by Lenart Luis Gonzalez Lagos and published by . This book was released on 2007 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil pile superstructure Interaction at Soft Or Liquefiable Soil Sites written by Daniel W. Wilson and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Soil structure Interaction written by John P. Wolf and published by Prentice Hall. This book was released on 1985 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Centrifuge Modeling of the BART Transbay Tube and Numerical Simulation of Tunnels in Liquefying Ground written by Jui-Ching Chou and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes centrifuge model tests and numerical analyses of tunnels in liquefiable soil. The prototype of the centrifuge tests was the Bay Area Rapid Transit (BART) Transbay Tube (TBT) that connects Oakland to San Francisco, CA, USA. During the tunnel construction, much of the gravelly backfill material around this tunnel was placed loosely under water at a relative density less than 50%. Because of the low relative density of the backfill material around the tube and low unit weight of the tube, there were concerns that tube might suffer large deformation due to buoyancy forces if the backfill material liquefied in an earthquake. BART engaged Fugro West Inc., Oakland, CA to assess the need for ground improvement to mitigate seismically-induced deformations of the tunnel, in particular, the deformations due to uplift of the tunnel in the liquefied backfill. Fugro recommended that their numerical analyses and deformation mechanisms should be further verified using centrifuge model tests. Centrifuge model tests were performed (1) to assess the stability of the BART Transbay Tube, (2) to confirm the uplift mechanisms of the BART Transbay Tube and (3) to verify numerical methods. Test results indicated that the anticipated uplift during the design earthquake would be acceptable (less than about 0.25 m). Three uplift mechanisms were observed in the centrifuge model tests: (1) a cyclic ratcheting mechanism of sand moving under the tunnel associated with cyclic lateral deformations of the tunnel, (2) seepage of water under the tunnel, and (3) heave of soft clay around the trench. Flow of the sand as a viscous liquid was not observed. Two approaches were used to record subsurface movements in the centrifuge experiments. The traditional approach used data from accelerometers and displacement transducers to determine the trajectory of the tunnel. A new approach, Electric Field Displacement Sensors (EFDS), involves installation of source and ground electrodes in the specimen through which well defined multi-directional electric fields can be set up in the specimen. The movement of measurement electrode (which can be attached to an object of interest) can then be determined simply by measuring its voltage. Li (2006) was the first to use this approach, but she used an electrode switching system to sequentially excite multidirectional electric fields. A new contribution of this thesis was the idea that independent electric fields data from different sources can be excited simultaneously at different frequencies; elimination of the need for the switching system has saved a lot of complexity in the equipment and also allowed much improved temporal resolution. After comparing the processed data from the EFDS and traditional approaches, the EFDS can capture the dynamic response pretty well but the EFDS has its limitations. The change of soil resistivity and the heterogeneities of the soil resistivity affect the estimated movements greatly but the change of the soil resistivity can not be captured from the voltage data in the current implementation. With continued work on solving its limitation, the EFDS could become a fairly inexpensive tool for tracking movements. A parametric study was performed using a finite difference program, FLAC 2D, In the numerical simulation, the UBC Sand model (Beatty and Byrne 1998) was used to model the behavior of liquefiable soils. A mesh sensitivity study was performed to decide the appropriate number of nodes for the simulations and how to best model sliding at interfaces between the soil and tunnel. In the parametric study, effects of different geometry characteristics and soil properties on the seismic behavior of the tunnel were explored and the results are summarized in a few dimensionless plots. After effects of various factors on the tunnel performance were understood, suggestions for the future tunnel design were made: (1) densify the liquefiable soils to reduce the cyclic mobility associated with liquefaction, (2) minimize the volume of the liquefiable soils and the thickness of the liquefiable soils underneath the tunnel to reduce the volume of pore water expelled and the space through which water and soil may flow under the tunnel, (3) make the elevation of the interface between high and low permeability materials shallow enough so that high pore pressures are not trapped near the base of the tunnel, (4) make the liquefiable soils as permeable as possible to drain high pore pressures away from the base of the tunnel, and (5) make the unit weight of the tunnel as close as to the surrounding soil.

Download or read book Soil pile superstructure Interaction at Soft Or Liquefiable Soil Sites written by Daniel W. Wilson and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Centrifuge Modeling of Liquefaction in Layered Soils written by Gregg Leland Fiegel and published by . This book was released on 1992 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil pile superstructure Interaction at Soft Or Liquefiable Soil Sites written by Daniel W. Wilson and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Centrifuge Modeling of Soil Liquefaction written by Abbas Abghari and published by . This book was released on 1982 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Centrifuge Modelling of Lateral Pipeline soil Interaction written by Moness Rizkalla and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: