Download or read book In Situ Determination of Dynamic Soil Properties Under an Excited Surface Foundation written by Jaehun Ahn and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic properties of soil are normally inferred from laboratory tests on collected samples or from empirical relations. The soil properties measured in the field can be very different from those predicted from laboratory tests. It is very difficult to determine directly in the field the variation of the shear modulus and damping with the level of excitation (level of strains). This remains today a major gap in our knowledge and our ability to conduct reliable seismic analyses. The main objective of this study is to assess the feasibility of determining reliably in situ the shear modulus and damping of the soil as functions of the level of strains, developing a method to compute these properties from the measured data and providing practical recommendations for the use of the procedure. To achieve this objective, extensive and comprehensive sets of experimental and analytical studies were conducted in parallel. Some numerical analyses were performed to provide a better understanding for performing in situ tests with the newly developed vibroseis loading systems. In addition, the dynamic response of a surface foundation in vertical vibration were studied. This dissertation mostly focuses on the numerical aspects of the problem while some experimental data are also studied and utilized. Field tests were conducted to estimate shear moduli of silty sands at two sites, the Capital Aggregate Quarry and the Texas A & M University sites. Estimated nonlinear shear moduli presented very consistent trends regardless of the analysis methods and test sites. They showed larger elastic threshold shear strains, 1.5 x 10−3 % for the Capital Aggregate Quarry site and 2 x 10−3 % for the Texas A & M University site, than the mean of shear modulus curve for cohesionless soils proposed by Seed and Idriss (1970). Estimated moduli closely followed the mean of Seed and Idriss (1970) at strains larger than 6 x 10−3 % for both sites. Internal damping ratio can also be estimated if additional data are gathered from in situ tests in the future.
Download or read book In Situ Determination of Dynamic Soil Properties written by FR. Brown and published by . This book was released on 1978 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geophysical procedures used to determine the shear modulus for soils are reviewed and the more recent improvements in each technique are discussed. The two most commonly used methods are identified and shear wave velocities by both methods are compared for nine different sites. Considering all of the variables involved in both the test procedures and the soil types, the agreement is considered good. Two newly developed large-strain procedures for obtaining soil properties in situ are also presented. One method is an impulse test which determines with closely spaced waveform measurements the change in shear wave velocity both as a function of depth and strain. The other method is a back-calculation procedure which corrects assumed model properties until agreement is reached between the calculated and field-measured response. Both methods offer promise for the future development of better large-strain field procedures for conducting more complex seismic studies.
Download or read book THE DETERMINATION OF SOIL PROPERTIES IN SITU BY AN IMPACT PENETROMETER written by and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents parts of the scientific investigations carried out under a task program related to the determination and assessment of surface dynamic soil properties by laboratory instrumentation. It first reviews the historical development of the hardness-penetrometer concept and presents a pilot model for a new aerial penetrometer. Basic theoretical considerations are then advanced regarding the stress-strain relationships in axial symmetry and the dynamic loads associated with a drop-impact penetrometer. The existing theory of elasticity solutions are then reviewed and the solutions for a sphere impacting on an ideally plastic and on an elasto-plastic semi-infinite solid are presented. The Hertz solution of an elastic sphere impacting on an elastic half-space is modified by using the elastic-viscoelastic analogy to find a solution for a sphere dropping onto a four parameter viscoelastic half-space. The problem of energy transfer during impact by vibrations is discussed shortly. The data for fifteen test series carried out with the pilot model penetrometer on natural soils and on some artificial materials are presented and evaluated. It is concluded that the principle of the drop impact-penetrometer is applicable in experiments for assessing the mechanical properties of a natural soil surface.
Download or read book Analytical Methods in Petroleum Upstream Applications written by Cesar Ovalles and published by CRC Press. This book was released on 2015-04-02 with total page 2054 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effective measurement of the composition and properties of petroleum is essential for its exploration, production, and refining; however, new technologies and methodologies are not adequately documented in much of the current literature. Analytical Methods in Petroleum Upstream Applications explores advances in the analytical methods and instrumentation that allow more accurate determination of the components, classes of compounds, properties, and features of petroleum and its fractions. Recognized experts explore a host of topics, including: A petroleum molecular composition continuity model as a context for other analytical measurements A modern modular sampling system for use in the lab or the process area to collect and control samples for subsequent analysis The importance of oil-in-water measurements and monitoring The chemical and physical properties of heavy oils, their fractions, and products from their upgrading Analytical measurements using gas chromatography and nuclear magnetic resonance (NMR) applications Asphaltene and heavy ends analysis Chemometrics and modeling approaches for understanding petroleum composition and properties to improve upstream, midstream, and downstream operations Due to the renaissance of gas and oil production in North America, interest has grown in analytical methods for a wide range of applications. The understanding provided in this text is designed to help chemists, geologists, and chemical and petroleum engineers make more accurate estimates of the crude value to specific refinery configurations, providing insight into optimum development and extraction schemes.
Download or read book Soil Dynamics and Foundation Modeling written by Junbo Jia and published by Springer. This book was released on 2017-11-26 with total page 741 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive topical overview on soil dynamics and foundation modeling in offshore and earthquake engineering. The spectrum of topics include, but is not limited to, soil behavior, soil dynamics, earthquake site response analysis, soil liquefactions, as well as the modeling and assessment of shallow and deep foundations. The author provides the reader with both theory and practical applications, and thoroughly links the methodological approaches with engineering applications. The book also contains cutting-edge developments in offshore foundation engineering such as anchor piles, suction piles, pile torsion modeling, soil ageing effects and scour estimation. The target audience primarily comprises research experts and practitioners in the field of offshore engineering, but the book may also be beneficial for graduate students.
Download or read book In Situ Measurement of Soil Properties written by and published by . This book was released on 1975-06-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On Determination of Dynamic Characteristics of Soil In Situ written by R. K. Bernhard and published by . This book was released on 1960 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Field experiments to determine dynamic soil characteristics, obtained either by sinusoidal or by impact excitation, yielded almost identical values. The results coincide rather closely with previously published theoretical considerations. The reasons for some inconsistencies, not accountable for at earlier tests, are discussed.
Download or read book Developments in Geotechnical Engineering from Harvard to New Delhi 1936 1994 written by A.S. Balasubramaniam and published by CRC Press. This book was released on 2021-06-30 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the developments that have taken place in the field of geotechnical engineering since the first international conference on Soil Mechanics and Foundation Engineering was held in Harvard University in 1936 until the January 1994 conference in New Delhi, India.
Download or read book Highway Research Review written by and published by . This book was released on 1962 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Determination of Dynamic Soil Properties and Their Use in Response Analysis written by R. W. M. Smith and published by . This book was released on 1971 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Determination of Dynamic Soil Properties and Their Use in Response Analysis written by Robin W. N. Smith and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1948 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geotechnical Abstracts written by and published by . This book was released on 1984 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Conference on in Situ Measurement of Soil Properties written by Conference on in Situ Measurement of Soil Properties and published by . This book was released on 1975 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Determination of Soil Properties in Situ written by David B. Campbell and published by . This book was released on 1969 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Textbook of Seismic Design written by G. R. Reddy and published by Springer. This book was released on 2019-08-03 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the seismic design of Structures, Piping Systems and Components (SSC). It explains the basic mechanisms of earthquakes, generation of design basis ground motion, and fundamentals of structural dynamics; further, it delves into geotechnical aspects related to the earthquake design, analysis of multi degree-of-freedom systems, and seismic design of RC structures and steel structures. The book discusses the design of components and piping systems located at the ground level as well as at different floor levels of the structure. It also covers anchorage design of component and piping system, and provides an introduction to retrofitting, seismic response control including seismic base isolation, and testing of SSCs. The book is written in an easy-to-understand way, with review questions, case studies and detailed examples on each topic. This educational approach makes the book useful in both classrooms and professional training courses for students, researchers, and professionals alike.
Download or read book Structural Dynamics written by Harry Grundmann and published by CRC Press. This book was released on 2002 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings contain contributions presented by authors from more than 30 countries at EURODYN 2002. The proceedings show recent scientific developments as well as practical applications, they cover the fields of theory of vibrations, nonlinear vibrations, stochastic dynamics, vibrations of structured elements, wave propagation and structure-borne sound, including questions of fatigue and damping. Emphasis is laid on vibrations of bridges, buildings, railway structures as well as on the fields of wind and earthquake engineering, repectively. Enriched by a number of keynote lectures and organized sessions the two volumes of the proceedings present an overview of the state of the art of the whole field of structural dynamics and the tendencies ot its further development.
