Static Loading Of Small Buried Arches
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Static Loading Of Small Buried Arches
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Author : H. L. Gill
language : en
Publisher:
Release Date : 1964
Static Loading Of Small Buried Arches written by H. L. Gill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
Static and dynamic tests have been performed to study the behavior of small buried arches. The objective was to gain information which will serve as a guide in developing design methods for underground structures. This report describes the static tests, the prime purposes of which were: (1) to obtain information on the behavior of a statically loaded soil-arch system, and (2) to provide data for comparison with that from a similar system subjected to blast loading. The test configuration consisted of two conterminous semicircular arches each 30 inches in diameter buried in dry sand with 6 inches of cover over the crown. The arches were identical except for differing footing widths. The entire system was contained by the NCEL atomic blast simulator pit, which is 9 feet by 10 feet in plan and 12 feet deep. Static loads up to 25 psi were applied to the surface of the sand as various measurements were being made. The test results show that the expected decrease in footing deflection with increase in footing width was accompanied by an increase of maximum moment in the arch. (Author).
Blast Loading Of Small Buried Arches
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Author : Jay R. Allgood
language : en
Publisher:
Release Date : 1963
Blast Loading Of Small Buried Arches written by Jay R. Allgood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Arches categories.
It was evident that the passive pressures which developed on the sides played the dominant role in providing resistance. It has been found that in static tests some of the surface load is carried by arching through the soil. In the dynamic tests the inertial forces of the soil above the arch were found to be important. The inertial load overcame the soil shear resistance so that a load approximately equal to the surface load acted on the structure. A model analysis of the system and subsequent comparison of the deflections from the small-structure tests and the Operation Plumbbob Structure 3.3 tests indicate that modeling of deflections is possible.
Static And Blast Loading Of Small Buried Cylinders
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Author : Jay R. Allgood
language : en
Publisher:
Release Date : 1964
Static And Blast Loading Of Small Buried Cylinders written by Jay R. Allgood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
This research was performed to obtain information on the behavior of shallow-buried cylinders subjected to static and blast loads in support of the task objective of gaining knowledge to provide guidelines for developing design methods for underground protective structures. It was especially desired to obtain data on the time and space variations of deflection, thrust, and moment under the two types of loading for purposes of making a comparison. The results show that the net arching across a flexible shallow-buried cylinder is small and that the maximum moment occurs at the bottom of the cylinder. Differences in response to static and blast loading are relatively small except for the crown, which deflects about twice as much under blast loading as under corresponding static loading. An analogy with the simple spring-mass system is drawn to explain this behavior. Information obtained on the influence of placing a low- strength isolating material in the soil over a cylinder indicates that such an expedient is of questionable benefit.
Model Study Of A Buried Arch Subjected To Dynamic Loading
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Author : Robert K. Tener
language : en
Publisher:
Release Date : 1964
Model Study Of A Buried Arch Subjected To Dynamic Loading written by Robert K. Tener and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Aluminum categories.
Static And Dynamic Tests Of Buried Unreinforced Concrete Arches
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Author : William J. Flathau
language : en
Publisher:
Release Date : 1966
Static And Dynamic Tests Of Buried Unreinforced Concrete Arches written by William J. Flathau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Concrete arches categories.
The primary objective of the study was to determine the response, to collapse, of buried semicircular, unreinforced concrete fixed-end arches of varying stiffnesses when subjected to both static and dynamic loads.
The Behavior Of Shallow Buried Cylinders
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Author : Jay R. Allgood
language : en
Publisher:
Release Date : 1965
The Behavior Of Shallow Buried Cylinders written by Jay R. Allgood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with categories.
A Model Study Of Dynamically Loaded Square Footings On Dry Sand
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Author : Jack K. Poplin
language : en
Publisher:
Release Date : 1969
A Model Study Of Dynamically Loaded Square Footings On Dry Sand written by Jack K. Poplin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Engineering models categories.
The investigation reported herein was undertaken to develop an approach to modeling displacements of surface and shallow-buried footings on dry sand subject to high-intensity, single-pulse loads. A hypothetical shallow-bured structure with an isolated footing loaded by airblast overpressure produced by detonation of a nuclear weapon was assumed for design of load pulses on nine model footings used: footing widths of 4.5, 6.0, and 7.5 in. and depth-of-burial to footing width ratios of 0, 0.5, and 1.0. The principles of similitude were used to scale length, force, and time in the models. The models were placed in mobile test bins of uniform, fine, dry sand (90 percent relative density) and subjected to dynamic and static loading. Nondimensional load-displacement relations dependent only on depth-of-burial ratio were developed relating maximum displacement to peak dynamic load, footing width, and soil shear strength gradient. When the dynamic response of the footings in the form of reaction-displacement curves was compared with static response, an increase in initial stiffness and ultimate strength was observed for dynamic loading. However, these dynamic increases were greatest when the static shear strength was lowest, i.e. footings on the surface, and were least for footings buried at a depth equal to its width where the static overburden produced a substantial increase in shear strength. (Author).
Technical Report
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Author :
language : en
Publisher:
Release Date :
Technical Report 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 Civil engineering categories.
Static And Dynamic Plate Bearing Tests On Dry Sand With Overburden
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Author : Charles Reed White
language : en
Publisher:
Release Date : 1964
Static And Dynamic Plate Bearing Tests On Dry Sand With Overburden written by Charles Reed White and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
Six static and 53 dynamic soil-bearing tests were made under simulated overburden pressures of zero to 15 psi to determine the load-displacement characteristics of buried footings. The static bearing modulus increased as overburden pressure increased up to an overburden pressure of approximately 6 psi. The dynamic bearing modulus increased exponentially with overburden pressure to an overburden pressure of 15 psi. Up to 3 psi overburden pressure, dynamic modulus was larger than static; but the difference was less at 3 psi overburden than at zero. The relationship between static and dynamic moduli was not firmly established for overburden pressures greater than 3 psi. These tests were made on a 15-inch-diameter bearing plate in dry sand using the NCEL atomic blast simulator. (Author).
The Response Of Soils To Dynamic Loadings
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Author : Robert V. Whitman
language : en
Publisher:
Release Date : 1970
The Response Of Soils To Dynamic Loadings written by Robert V. Whitman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Materials categories.