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Wave Propagation Studies In Laterally Confined Columns Of Sand

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Wave Propagation Studies In Laterally Confined Columns Of Sand

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Author : Warren J. Baker
language : en
Publisher:
Release Date : 1967

Wave Propagation Studies In Laterally Confined Columns Of Sand written by Warren J. Baker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Seismic wave propagation categories.

An experimental study of the relationship between pertinent wave-propagation parameters and the one-dimensional stress-strain behavior of two sands was conducted. The stress-strain relation for the sands was characterized by a nonlinear strain-hardening behavior. The nature of the stress-strain curve implied that shocks should form or be sustained in the soil. This phenomenon was studied by observing the dynamic and kinematic characteristics generated by a soft-fronted stress pulse applied at one end of a long slender column of laterally confined sand. To develop a method of predicting the kinematics of wave propagation from the stress-strain curve, the observed wave-propagation parameters were related to laboratory stress-strain curves. A unique sample container, loading system, and instrumentation system was developed. The experiments approximated one-dimensional conditions up to reflected stresses of 1,600 psi. The results indicated the shocking-up of the soft-fronted input pulse that could be predicted from the laboratory stress-strain curve. The particle-velocity versus wave-velocity relationships dictated the change in shape of the kinematic pulse and could be predicted using a secant modulus analysis technique. A very high stress versus time gradient (rise times less than 50 microsec) was observed to form as the wave propagated through the soil.

Technical Abstract Bulletin

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Author :
language : en
Publisher:
Release Date :

Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Science categories.

Similitude Study Of Flexible Buried Arches Subjected To Blast Loads

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Author : Jimmy P. Balsara
language : en
Publisher:
Release Date : 1968

Similitude Study Of Flexible Buried Arches Subjected To Blast Loads written by Jimmy P. Balsara and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Aluminum categories.

The objective of the study was to investigate and verify model-to-prototype scaling relations for blast loaded buried arches that respond both elastically and inelastically. Four geometrically similar, semicircular aluminum alloy arches with 4-, 8-, 12-, and 36-inch diameters were buried in dense dry sand and subjected to air-blast-induced loads on the surface. The tests were conducted at the Large Blast Load Generator located at the U.S. Army Engineer Waterways Experiment Station. The results of two series of tests, each consisting of 3 repeated shots, ranging from 70 to 300 psi, are presented. Within the range of parameters investigated, the scaling of the dependent variables were adequately verified. These variables included acceleration, velocity, displacement, thrust, and bending moment. (Author).

Modern Protective Structures

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Author : Theodor Krauthammer
language : en
Publisher: CRC Press
Release Date : 2008-02-01

Modern Protective Structures written by Theodor Krauthammer and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-02-01 with Technology & Engineering categories.

In today's world, reasonably predictable military operations have been replaced by low intensity conflicts-less predictable terrorist activities carried out by determined individuals or small groups that possess a wide range of backgrounds and capabilities. Because of the threats posed by this evolving type of warfare, civil engineers and emergency personnel face new challenges in designing facilities to protect lives and property and in conducting effective rescue operations and forensic investigations. Addressing these needs, Modern Protective Structures develops realistic guidelines for the analysis, design, assessment, retrofit, and research of protected facilities. After introducing a comprehensive risk management approach, the author provides a general background on explosive devices and their capabilities as well as explosive effects and the processes that generate them. He then discusses the effects of conventional and nuclear explosions. The book subsequently considers the significant design differences between conventional and nuclear loads and between existing design procedures and state-of-the-art information from recent research. It also summarizes existing blast-resistant design approaches and describes the dynamic responses of structural systems to blasts, shocks, and impacts. Additional coverage includes the behavior of specific structural connections, the traditional concept of P-I diagrams, and progressive collapse. The book concludes with a systematic and balanced protective design approach. Tackling the analytical, design, assessment, and hazard mitigation issues associated with short-duration dynamic loads, this book examines how impulsive loads affect various types of buildings and facilities. It provides the necessary material to help ensure the safety of persons, assets, and projects.

Highway Research In Progress

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Author :
language : en
Publisher:
Release Date : 1968

Highway Research In Progress written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Highway research categories.

Journal

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Author : American Society of Civil Engineers. Soil Mechanics and Foundations Division
language : en
Publisher:
Release Date : 1970

Journal written by American Society of Civil Engineers. Soil Mechanics and Foundations Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Engineering geology categories.