Torsional Simple Shear Device, Liquefaction and Dynamic Properties of Sands PDF Download

Author: Isao Ishibashi
Publisher:
ISBN:
Category : Soil liquefaction
Languages : en
Pages : 286

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Book Description

Author: Sheng-Huoo Ni
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 476

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Book Description

Author: Swami Saran
Publisher: CRC Press
ISBN: 1000298396
Category : Technology & Engineering
Languages : en
Pages : 1137

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Book Description
The book offers systematic dynamic analysis of soils and their engineering applications, including machine foundations, and aims to develop a clear understanding of the subject. It comprises sixteen chapters. Chapter 1 introduces the reader to the various problems in soil dynamics. In Chapter 2, concepts of theory of vibrations are discussed along with their applications in designing Vibration Absorbers and Pickups. Wave propagation in elastic medium including wave refraction in layered medium is covered in Chapter 3. Chapter 4 deals with the procedure of determining dynamic properties of soils using various laboratory and field tests. Dynamic earth pressures in retaining walls and dynamic bearing capacity of footings are dealt with in Chapters 5 and 6 respectively. Chapters 7and 8 respectively deal with dynamic behavior of pile foundations and slopes. Causes of liquefaction of soils and prediction of liquefaction potential have been discussed in Chapter 9. In Chapter 10, the procedure of estimating the unbalanced forces in various types of machines are covered. Chapters 11, 12 and 13 deal with the analysis and design of foundations of reciprocating machine, hammer, and turbo-generators respectively. In Chapter 14, problems of vibration isolation and screening are dealt with. Chapter 15 discusses the analysis and design of reinforced earth wall located in seismic areas. A new concept of a conventional rigid retaining wall having reinforced backfill is presented in Chapter 16, giving complete analysis and design procedure considering seismic forces.

Author: Isao Ishibashi
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 74

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Book Description

Author: Yu-Lin Alice Jen
Publisher:
ISBN:
Category :
Languages : en
Pages : 416

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Book Description

Author: Adolfo Alarcon-Guzman
Publisher:
ISBN:
Category :
Languages : en
Pages : 591

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Book Description
Liquefaction of saturated sand and silty sand deposits has been recognized as a major cause of damage during earthquakes. However, in spite of many research studies during the past two decades, there are still conflicting opinions on critical aspects of the phenomenon of soil liquefaction, including the definition of the term "liquefaction." For these reasons, a research program on the behavior of cohesionless soils under cyclic loading was initiated at Purdue University. An important effort was devoted to delineate and understand the physical factors controlling the response of cohesionless soils to cyclic loading and consequently, the factors involved in the different phenomena which have been described with the term "liquefaction" such as steady-state flow, a condition of zero effective stress, or cumulative residual strains due to cyclic loading. A new hybrid resonant column/torsional shear apparatus was designed and built as a part of this research program. The new apparatus permits the determination of dynamic soil properties on a single solid or hollow cylinder specimen over the entire range of shear strain amplitudes of engineering interest, i.e. from 10('-4)% to 10%. Torsional shear tests were performed with the new apparatus on reconstituted specimens of Ottawa 20-30 sand. Among other things, it was found that: (a) the maximum shear modulus, G(, max), is relatively insensitive to important factors affecting the undrained behavior of sands such as stress ratio (and hence fabric), stress history, and cyclic prestraining. Consequently, a direct correlation between G(, max) and liquefaction potential is not possible; (b) if staged testing includes the determination of shear moduli by means of resonant column tests, which imply the application of a considerable number of cycles, it can lead to significant overestimations of shear modulus for sands with no prior cyclic strain history even at shear strain amplitudes as low as 1.1 x 10('-2)%; and (c) at a given rela.

Author: Osama Tahseen Abu-Safaqah
Publisher:
ISBN:
Category :
Languages : en
Pages : 590

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Book Description

Author: RM. Chung
Publisher:
ISBN:
Category : Damping
Languages : en
Pages : 10

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Book Description
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 (?

Author: Library of Congress. Copyright Office
Publisher: Copyright Office, Library of Congress
ISBN:
Category : Copyright
Languages : en
Pages : 1608

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Book Description

Author: A. Alarcon
Publisher:
ISBN:
Category : Cyclic shear tests
Languages : en
Pages : 9

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Book Description
A new hybrid resonant column/torsional shear apparatus has been developed, which permits the determination of dynamic soil properties on a single solid or hollow cylinder specimen over the entire range of shear strain amplitudes of engineering interest, that is, from 10-4 to 10%. The main characteristics of both the resonant column and torsional shear tests are presented with emphasis on those factors that influenced the design of the new apparatus. The new apparatus is described in detail, and representative test results to demonstrate its capabilities are presented.