Download or read book Evaluation of Dynamic Properties of Sands by Resonant Column Testing written by RM. Chung and published by . This book was released on 1984 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Torsional resonant column tests were performed on Monterey No. 0 sand of 60% relative density under confining pressures ranging from 10 to 300 kPa to evaluate the dynamic properties of the sand. Both solid and hollow cylindrical specimens were used in testing, and shear moduli and damping ratios were determined for cyclic shear strain amplitudes from 10-4 to 5 × 10-2%. The test results indicated that the type of specimen, that is, solid or hollow cylinder, had no significant effect on the calculated shear moduli and damping ratios, except that at very low strain amplitudes (?
Download or read book Effect of Loading Frequency on Dynamic Properties of Soils Using Resonant Column written by Soheil Moayerian and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic properties of soils (shear stiffness and damping ratio) are critical for the design of structures subjected to vibrations. The dynamic properties of a benchmark standardized laboratory sand (Ottawa silica sand) were evaluated with two different resonant column devices, utilising software with different analytical approaches for the evaluation of soil properties. The dynamic properties (shear modulus and damping ratio) are evaluated as a function of the shear strain level. The results are compared to evaluate the effect of the type of equipment and the form of the data analysis on the measured dynamic properties of the samples. The results are discussed in light of the applicability of the procedures in practice, the ease of the testing methods, and the errors they introduced into analysis and design. In general, the shear wave velocities obtained from the two different devices are in good agreement. However, the damping ratios they give show considerable differences as strains increase. Dynamic properties are typically measured by curve fitting of the transfer function between the excitation and the response using the resonant column device. However, the force function generated by sinusoidal sweep or random noise excitations induce different shear strain levels at different frequencies. Consequently, the shape of the measured transfer function is distorted and differs from the theoretical transfer function for an equivalent single-degree-of-freedom system. The difference between the measured and theoretical transfer functions as well as the bias in the computed dynamic properties becomes more pronounced with the increase in shear strain. This study presents a new methodology for the evaluation of dynamic properties from an equivalent constant-strain transfer function. The soil specimen is excited simultaneously using a sinusoidal excitation (carrier signal) at the required strain level and a small amplitude, narrow band random noise. The strain level induced by the fixed sine is shown to control the resonant frequency of the specimen; whereas the random noise introduces the required frequency bandwidth to determine the transfer function and hence the dynamic properties at a constant strain level. The new methodology also shows a good potential for the evaluation of frequency effects on the dynamic properties of soils in resonant column testing.
Download or read book Evaluation of the Dynamic Properties of Artificially Cemented Sand at Low Confining Pressures written by Deron J. Van Hoff and published by . This book was released on 1994 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Oversized Particles on the Dynamic Properties of Sand Specimens Evaluated by Resonant Column Testing written by Boonam Shin and published by . This book was released on 2014 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was motivated by the fact that many times intact specimens with a number of oversized particles are dynamically tested in the laboratory and the impact of the particles on the dynamic properties is unknown. The effects of oversized particles represented by gravel particles on the shear modulus (G) and material damping ratio (D) of a uniform sand were evaluated in the linear ([gamma] ≤ 0.001%) and nonlinear ([gamma] > 0.001%) ranges of shear strain with combined resonant column and torsional shear (RCTS) equipment. The sand used in this investigation is a uniform sand as a reference, well-characterized material on the dynamic properties. Sand-gravel specimens were constructed using the undercompaction method. A variety of rounded gravel particles was used in building the specimens. Dynamic tests on the sand-gravel specimens were performed, and the tests results are presented. Among the findings of this investigation are that, compared to uniform sand: (1) oversized gravel particles symmetrically located along the longitudinal axis in uniform sand generally decreased slightly the small-strain shear modulus (Gm̳a̳x̳), (2) oversized gravel particles asymmetrically located away from the longitudinal axis of rotation resulted in slight increases in Gm̳a̳x̳ and the small-strain material damping ratio (Dm̳i̳n̳), (3) the G - log [gamma] relationships of sand-gravel specimens with asymmetrically located gravel particles are generally above those with gravel particles symmetrically located along the longitudinal axis, and (4) the G/Gm̳a̳x̳ - log [gamma] relationships of all specimens were reasonably close for the nonlinear ranges covered in these tests ([gamma] 0.05 % and G/Gm̳a̳x̳ 0.6). As long as the oversized particles were near the axis of rotation, the particles had little effect on the dynamic properties (Gm̳a̳x̳, Dm̳i̳n̳ and G - log [gamma] relationships) regardless of sizes and numbers of particles. However, once the oversized particles were located away from the axis of rotation and closer to the perimeter of the specimen, the oversized particles influenced the dynamic properties. Finally, the additions of oversized particles located both symmetrically and asymmetrically in the uniform sand specimens have little impact on the nonlinear dynamic properties (G/Gm̳a̳x̳ - log [gamma] and D - log [gamma] relationships) which compared well with uniform sand.
Download or read book Dynamic Properties of Sand Under True Triaxial Stress States from Resonant column Torsional Shear Tests written by Sheng-Huoo Ni and published by . This book was released on 1987 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Properties of Fine Liquefiable Sand and Calcareous Sand from Resonant Column Testing written by Yaning Wang (Ph. D.) and published by . This book was released on 2015 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of the dynamic properties of two specific kinds of granular soils is performed using torsional resonant column testing. The sandy soils are: (1) liquefiable sand from Christchurch, New Zealand, and (2) calcareous sand from Puerto Rico. The effects of isotropic effective confining pressure, shear strain amplitude, void ratio, and total unit weight on the small-strain and nonlinear dynamic properties of both types of sand are presented and discussed. Empirical models from previous studies are examined to determine how well the models fit the test results.
Download or read book Previbration Signature on Dynamic Properties of Dry Sand written by Z. X. Yang and published by . This book was released on 2019 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The shear modulus and damping ratio of soils at low to medium strains are essential input parameters in dynamic response analysis of soils. As soil elements in the field always have a history of being subjected to vibrations due to earthquakes, construction works, and vehicle motions, etc., the previbration effect on the dynamic properties of soils needs to be addressed appropriately. This study presents a series of tests performed by a newly developed resonant column system that enables the assessment of the dynamic properties of soils that have only undergone dozens of vibration cycles to investigate the impact of the vibration history on the dynamic properties of dry sand. Both the shear modulus and damping ratio of sand under different confining pressures (p′) are measured after the application of a previbration with a wide range of vibration amplitudes (?pre) and number of cycles (N). The results show that an elastic threshold strain exists for the dynamic properties of sand, beyond which the effect of the vibration history can be identified from the shear modulus reduction and damping ratio curves. The results also confirm that the effect of the vibration history on dry sand depends on the test variables of?pre,N, andp′. In addition, a new interpretation method is proposed to quantify the combined effects of?preandNon the signature of the vibration history, which could potentially be useful for interpreting the dynamic properties of the in situ soils that may experience previbration.
Download or read book Vibrations of Soils and Foundations written by Frank Edwin Richart and published by Prentice Hall. This book was released on 1970 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: For graduate students in soil dynamics with a background in statics and elementary dynamics.
Download or read book Evaluation of Dynamic Soil Properties written by Dugkeun Park and published by . This book was released on 1998 with total page 1168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Dynamics written by T. G. Sitharam and published by Springer Nature. This book was released on 2021-03-31 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents select papers presented at the 7th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. The papers discuss advances in the fields of soil dynamics and geotechnical earthquake engineering. A strong emphasis is placed on connecting 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 researchers and practicing engineers alike.
Download or read book Structural Dynamics Vol 1 written by Proceedings Editors and published by Taylor & Francis. This book was released on 2022-03-02 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1991. This volume contains the proceedings of the first European Conference on Structural Dynamics (Eurodyne 90) held at the Ruhr University, Bochum, FRG in June 1990. Volume one (169-9) covers impact, dynamic stability, soil dynamics, system identification, earthquake engineering, earthquake engineering R/C structures, and earthquake engineering for steel structures.
Download or read book Proceedings of 17th Symposium on Earthquake Engineering Vol 3 written by Manish Shrikhande and published by Springer Nature. This book was released on 2023-07-03 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents select proceedings of the 17th Symposium on Earthquake Engineering organized by the Department of Earthquake Engineering, Indian Institute of Technology Roorkee. The topics covered in the proceedings include engineering seismology and seismotectonics, earthquake hazard assessment, seismic microzonation and urban planning, dynamic properties of soils and ground response, ground improvement techniques for seismic hazards, computational soil dynamics, dynamic soil–structure interaction, codal provisions on earthquake-resistant design, seismic evaluation and retrofitting of structures, earthquake disaster mitigation and management, and many more. This book also discusses relevant issues related to earthquakes, such as human response and socioeconomic matters, post-earthquake rehabilitation, earthquake engineering education, public awareness, participation and enforcement of building safety laws, and earthquake prediction and early warning system. This book is a valuable reference for researchers and professionals working in the area of earthquake engineering.
Download or read book Geotechnical Earthquake Engineering written by Ikuo Towhata and published by Springer Science & Business Media. This book was released on 2008-12-19 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: This fascinating new book examines the issues of earthquake geotechnical engineering in a comprehensive way. It summarizes the present knowledge on earthquake hazards and their causative mechanisms as well as a number of other relevant topics. Information obtained from earthquake damage investigation (such as ground motion, landslides, earth pressure, fault action, or liquefaction) as well as data from laboratory tests and field investigation is supplied, together with exercises/questions.
Download or read book Deformation Characteristics of Geomaterials Comportement Des Sols Et Des Roches Tendres written by H. Di Benedetto and published by CRC Press. This book was released on 2003-01-01 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main themes of this conference are experimental investigations into deformation properties - from very small strains to beyond failure, laboratory, in-situ and field observation interpretations, and behaviour characterization and modelling. Emphasis is placed on exploring recent investigations into time-related stresses, and on applying advanced geotechnical testing to real engineering problems.
Download or read book Dynamic Properties of Soils with Non plastic Fines written by David Umberg and published by . This book was released on 2012 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results from an experimental study on the dynamic properties of sand with nonplastic silt are presented. Combined resonant column and torsional shear equipment is used to evaluate the effects of confining pressure, shearing strain, frequency, and number of cycles of loading on the dynamic properties of silty sand. The goal of this study is to determine if relationships in the literature for sands and gravels are accurate for predicting the shear modulus and material damping characteristics of soil with nonplastic fines or if the incorporation of a fines content parameter improves predictions. This goal was primarily accomplished by reconstituting and testing samples of an alluvial deposit from Dillon Dam, Dillon, Colorado according to predetermined gradation curves with variable amounts of non-plastic fines. Among the findings of this investigation are: (1) soil parameters such as Cu and D50 can be related to dynamic properties of soils with up to 25% fines, (2) the effects of non-plastic fines on the small-strain dynamic properties of soils are not very pronounced for soils with less than 25% fines, and (3) an increase in the amount of non-plastic fines in uniform soils or soils with more than 25% fines generally results in lower values of small-strain shear modulus, higher values of small-strain material damping, and more linear G/Gmax - log([gamma]) and D - log([gamma]) curves. The effect of non-contacting, larger granular particles in a finer soil matrix is also investigated along with the impact of removing larger particles from laboratory samples.
Download or read book Small strain dynamic properties of dry sand from the free free resonant column written by Jaywantsinh G. Vaghela and published by . This book was released on 1995 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transparent Soil Modelling Technique and Its Application written by Honghua Zhao and published by Springer Nature. This book was released on 2022-11-29 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book systematically introduces the advancement of transparent soil modelling technique and its application. The transparent soil modelling technique provides an essential tool for visualizing soil-structure interaction and other geotechnical problems such as grouting, soil plugging. The geotechnical properties of the newest transparent soils were reported on model sand, clay and rock. In addition, more advanced image processing methods were summarized. In this book, numerous applications of transparent soil modelling techniques for different geotechnical problems were presented, and the results obtained are supplemented by numerical calculation and theoretical analysis.
