Effects of Relative Density and Pulse Duration on Dynamic Response of Footings Buried in Sand PDF Download
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Author: Jack K. Poplin
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages : 76
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Book Description
Author: Jack K. Poplin
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages : 76
Get Book Here
Book Description
Author: Jack K. Poplin
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages : 42
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Book Description
This investigation was undertaken to determine the effect of saturation of dense sand on the response of square footings to nuclear blast-type loading. Tests were conducted with footings on the surface and at a depth of burial equal to the footing width with a water table coincident with the plane of the footing. The results of these tests were compared with data from similar tests on dry sand from a preceding study. Saturation of dense sand had the effect of reducing maximum displacement. The displacements of surface footings were only about 30 percent of the displacement of footings on dry sand with equivalent soil density and loading condition, and the displacement of shallow buried footings was reduced by 50 percent. Empirical load-displacement curves developed from previous studies on dry sand were shown to be conservative when used to predict the response of footings on saturated dense sand. The primary difference in response occurred after peak reaction. The footings on saturated dense sand came to rest immediately, while footings on dry sand continued to displace for some short distance. This behavior was attributed to the development of transient negative pore pressures resulting from dilation of the sand. A similar laboratory investigation on a medium-density sand is recommended in order to determine whether or not any tendency toward liquefaction may occur at the lower end of the range of densities of interest for protective structure foundations. (Author).
Author: Hugh M. Taylor
Publisher:
ISBN:
Category : Concrete footings
Languages : en
Pages : 112
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 784
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Author: U.S. Army Engineer Waterways Experiment Station
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 430
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Author: United States. Army. Corps of Engineers
Publisher:
ISBN:
Category :
Languages : en
Pages : 438
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Author: Waterways Experiment Station (U.S.)
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 322
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Author: Jack K. Poplin
Publisher:
ISBN:
Category : Engineering models
Languages : en
Pages : 114
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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).
Author: Guy E. Habercom
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages : 636
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Author: Mississippi State University
Publisher:
ISBN:
Category :
Languages : en
Pages : 716
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