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Laboratory Investigation Into Evaluation Of Sand Liquefaction Under Transient Loadings
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Book Synopsis Laboratory Investigation Into Evaluation of Sand Liquefaction Under Transient Loadings by : Wing Shun Kwan
Download or read book Laboratory Investigation Into Evaluation of Sand Liquefaction Under Transient Loadings written by Wing Shun Kwan and published by . This book was released on 2015 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current laboratory procedures for evaluating liquefaction potential are still the same as 40 years ago, with minor updates. The complex seismic loading motions are simplified to a series of uniform harmonic sinusoidal loading cycles with amplitudes related to the maximum amplitude of a given ground motion; liquefaction resistance is then evaluated as the load generating liquefaction in a predefined number of harmonic loading cycles. The simplified methods of loading and resistance characterizations are a crude proxy and provide limited information in predicting the time of liquefaction triggering and therefore, the expected effects/damage of seismic events. Specific details of the time of soil liquefaction within a ground motion can be better understood from laboratory testing. Among the available element-level types of cyclic testing, cyclic simple shear (CSS) tests are the most popular and commonly used. The CSS tests provide a satisfactory simulation of seismic induced in-situ stresses. A testing program consisting of a series of multi-stage undrained direct simple shear tests was performed using the hydraulically-actuated GCTS cyclic simple shear apparatus. The apparatus had been modified and upgraded so that it is capable of applying user-specified, transient loading histories to Nevada Sand soil samples. Reconstituted specimens were prepared by the wet pluviation method at two different densities, 40% and 70%, followed with back-pressure saturation and K0 consolidation. The shearing phase was conducted in three distinctive stages: (1) Scaled transient stress histories, (2) modulated sinusoid with a taper-up shape stress histories, (3) static monotonic loads. All shearing stages were performed under continuous undrained conditions. This research program had two major motivations. The first motivation is to provide element-level tests subjected to transient loadings, so that the soil responses of excess pore pressure generation and shear strain along the time domain can be measured. The transient loading was selected from a suite of ground motions with different spectral and temporal characteristics to cover a wide range of possible ground motions. The second motivation is to investigate the performances of four Intensity Measures (IMs): CAV5, Arias Intensity, Normalized Energy Demand and PGA magnitude. These IMs were proven to be more efficient predictors of soil responses than peak acceleration. The experiments provide a database that can systematically illustrate the response of liquefiable materials subjected to transient ground motions before and after liquefaction; such a database was virtually non-existent prior to this study. Therefore, the data generated in this study supports the development of improved and more informative procedures for the evaluation of liquefaction potential, the effects of liquefaction, post-liquefaction responses, and more accurate constitutive models for liquefiable soils.
Book Synopsis Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022) by : Lanmin Wang
Download or read book Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022) written by Lanmin Wang and published by Springer Nature. This book was released on 2022-09-19 with total page 2417 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 4th International Conference on Performance-based Design in Earthquake Geotechnical Engineering (PBD-IV) is held in Beijing, China. The PBD-IV Conference is organized under the auspices of the International Society of Soil Mechanics and Geotechnical Engineering - Technical Committee TC203 on Earthquake Geotechnical Engineering and Associated Problems (ISSMGE-TC203). The PBD-I, PBD-II, and PBD-III events in Japan (2009), Italy (2012), and Canada (2017) respectively, were highly successful events for the international earthquake geotechnical engineering community. The PBD events have been excellent companions to the International Conference on Earthquake Geotechnical Engineering (ICEGE) series that TC203 has held in Japan (1995), Portugal (1999), USA (2004), Greece (2007), Chile (2011), New Zealand (2015), and Italy (2019). The goal of PBD-IV is to provide an open forum for delegates to interact with their international colleagues and advance performance-based design research and practices for earthquake geotechnical engineering.
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Bases for Regulatory Guide for Soil Liquefaction by : J. P. Koester
Download or read book Technical Bases for Regulatory Guide for Soil Liquefaction written by J. P. Koester and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Energy Research and Development Administration. Technical Information Center Publisher : ISBN 13 : Total Pages :1680 pages Book Rating :4.3/5 (129 download)
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration. Technical Information Center
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 1680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Offshore Structures by : Mohamed A. El-Reedy
Download or read book Offshore Structures written by Mohamed A. El-Reedy and published by Gulf Professional Publishing. This book was released on 2012-08-21 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: With most of the easy gas and oil reserves discovered and prices rebounding, companies are now drilling far offshore in extreme weather condition environments. As deepwater wells are drilled to greater depths, engineers and designers are confronted with new problems such as water depth, weather conditions, ocean currents, equipment reliability, and well accessibility. Offshore Structure Design, Construction and Maintenance covers all types of offshore structures and platforms employed worldwide. The ultimate reference for selecting, operating and maintaining offshore structures, this book provides a road map for designing structures which will stand up even in the harshest environments. The selection of the proper type of offshore structure is discussed from a technical and economic point of view. The design procedure for the fixed offshore structure will be presented and how to review the design to reach the optimum solution. Nonlinear analysis (Push over) analysis will be presented as a new technique to design and assess the existing structure. Pile design and tubular joint with the effect of fatigue loading will be presented also from a theoretical and a practical point of view. With this book in hand, engineers receive the most up-to-date methods for performing a structural life cycle analysis; implement maintenance plans for topsides and jackets, using non destructive testing. Under water inspection is discussed for hundreds of platforms in detail. Advanced repair methodology for scour, marine growth and damaged or deteriorating members are discussed. Risk based under water inspection techniques are covered from a practical pint of view. In addition, the book will be supported by an online modeling and simulation program with will allow designers to save time and money by verifying assumptions online. One stop guide to offshore structure design and analysis Easy to understand methods for structural life cycle analysis Expert advice for designing offshore platforms for all types of environments Save time and money by verifying designs online
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications of the National Institute of Standards and Technology ... Catalog by : National Institute of Standards and Technology (U.S.)
Download or read book Publications of the National Institute of Standards and Technology ... Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1983 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Model Materials Evaluation by : Ernest C. McNair
Download or read book Model Materials Evaluation written by Ernest C. McNair and published by . This book was released on 1976 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Soil Behavior Under Earthquake Loading Conditions by : Shannon & Wilson
Download or read book Soil Behavior Under Earthquake Loading Conditions written by Shannon & Wilson and published by . This book was released on 1972 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Track Geotechnology and Substructure Management by : Ernest Theodore Selig
Download or read book Track Geotechnology and Substructure Management written by Ernest Theodore Selig and published by Thomas Telford. This book was released on 1994-10-05 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive study provides practical advice and guidance on the important topics of rail transport and ground engineering, the use of which will result in optimum quality with the minimum maintenance effort and the most economical use of resources. The authors have synthesized all of their international knowledge and experience in this field, and produced, for the first time, a definitive guide for the design, construction, maintenance and renewal of railway track as they relate to geotechnology.
Book Synopsis Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering by : The Organizing Committee of the 16th ICSMGE
Download or read book Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering written by The Organizing Committee of the 16th ICSMGE and published by IOS Press. This book was released on 2005-09-12 with total page 3742 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 16th ICSMGE responds to the needs of the engineering and construction community, promoting dialog and exchange between academia and practice in various aspects of soil mechanics and geotechnical engineering. This is reflected in the central theme of the conference 'Geotechnology in Harmony with the Global Environment'. The proceedings of the conference are of great interest for geo-engineers and researchers in soil mechanics and geotechnical engineering. Volume 1 contains 5 plenary session lectures, the Terzaghi Oration, Heritage Lecture, and 3 papers presented in the major project session. Volumes 2, 3, and 4 contain papers with the following topics: Soil mechanics in general; Infrastructure and mobility; Environmental issues of geotechnical engineering; Enhancing natural disaster reduction systems; Professional practice and education. Volume 5 contains the report of practitioner/academic forum, 20 general reports, a summary of the sessions and workshops held during the conference.
Book Synopsis Advanced Soil Dynamics and Earthquake Engineering by : Bharat Bhushan Prasad
Download or read book Advanced Soil Dynamics and Earthquake Engineering written by Bharat Bhushan Prasad and published by PHI Learning Pvt. Ltd.. This book was released on 2011 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energy-Based Seismic Engineering by : Humberto Varum
Download or read book Energy-Based Seismic Engineering written by Humberto Varum and published by Springer Nature. This book was released on 2023-06-23 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the latest advances, innovations, and applications in the field of seismic engineering, as presented by leading researchers and engineers at the 2nd International Workshop on Energy-Based Seismic Engineering (IWEBSE), held in Porto, Portugal, on July 3–6, 2023. The book covers a diverse range of topics, including energy-based EDPs, damage potential of ground motion, structural modeling in energy-based damage assessment of structures, energy dissipation demand on structural components, innovative structures with energy dissipation systems or seismic isolation, as well as seismic design and analysis. Selected by means of a rigorous peer-review process, they will spur novel research directions and foster future multidisciplinary collaborations.
Book Synopsis Impact of Height Control on Constant Volume Simple Shear Testing on Sand by : Yuta Nakamura
Download or read book Impact of Height Control on Constant Volume Simple Shear Testing on Sand written by Yuta Nakamura and published by . This book was released on 2017 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquefaction is a failure behavior of saturated sand under undrained condition experiencing transient, usually seismic, loading. Current laboratory procedures for evaluating liquefaction behaviors and potentials include using simple shear tests to simulate a vertical propagating seismic wave or a monotonic load. To better simulate field conditions, the sand specimens are tested at saturation under undrained conditions. However, undrained condition can be simulated by keeping the volume of the specimen constant during the test. When performing simple shear tests under constant volume condition, ASTM Standard D6528 allows up to 0.05% volume change of the specimen to be considered a valid equivalent undrained test. Volumetric change of the specimen during constant volume shear impacts the changes in the normal stresses caused by the contractive or dilative behaviors of sand under constant volume condition. This impact on the change in the normal stress, even while the vertical deformations are within the allowed range, can be significant and is a function of the specimen properties. For this research, simple shear tests were run on different sand specimens using the modified UT Cyclic Simple Shear device. The previous version of the device tested saturated sand specimens under truly undrained conditions, while the modifications allowed dry sand specimens to be tested under constant volume conditions to simulate undrained condition. The modifications to the device were to increase the rigidity of the system and overall quality of the results. Monotonic and cyclic loading test results were obtained from the modified testing device. Analyzing the monotonic test results found that even small height changes to the specimen will affect the contractive and dilative behaviors of the specimen. Contractive height change of loose specimens decreased the amount of generated positive change in the axial stress during contraction, while the dilative height change to the dense specimens increased the dilative stress changes at high shear strains. Cyclic test results were compared to the results from corresponding tests obtained from the previous version of the testing device to verify the effect of the modification, as well as comparing the results of constant volume and undrained conditions.The results show that specimens tested under constant volume condition displayed lower strength than the specimen under undrained condition. The dense specimens showed a more significant reduced strength with the difference increasing with the amplitude of vertical movement of the top platen during cyclic loading. Finally, methods of remediating the stress change were proposed. These methods, while experimental, could be modified and used to improve the quality of the simple shear test results under constant volume condition
Book Synopsis Cyclic behaviour and liquefaction potential of silty sand: Experimental and numerical investigations by : Abdulaziz Osman Abdelkadr
Download or read book Cyclic behaviour and liquefaction potential of silty sand: Experimental and numerical investigations written by Abdulaziz Osman Abdelkadr and published by BoD – Books on Demand. This book was released on 2023-01-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study experimental and numerical investigations have been carried out with the emphasis on studying the behaviour and liquefaction state of typical silty sand sampled from the Mekelle area in Ethiopia under monotonic and cyclic undrained loadings. Experiments have been carried out to measure the pore pressure accumulation, deformation characteristics and related effective stress paths. A numerical model was then used to simulate the behaviour and liquefaction state associated with the changes in the stress-strain-pore pressure levels by means of the finite element method (FEM) using the FE code Tochnog (Tochnog Professional Company 2021).
