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Predicting Blast Induced Body Motions Of A Buried Structure With Footings
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Book Synopsis Predicting Blast-induced Body Motions of a Buried Structure with Footings by : Jay R. Allgood
Download or read book Predicting Blast-induced Body Motions of a Buried Structure with Footings written by Jay R. Allgood and published by . This book was released on 1967 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: An approximate theory is presented for predicting the absolute and relative body deflections of shallow-buried shelters in order to provide the designer with a rational approach for selecting footing dimensions. The theory consists of two coupled parts, one that describes the motion of the free field and another that defines the motion of a model of the structure, its foundation, and the covering soil. The soil characteristics are represented by straight-line approximations to the loading and unloading portions of the stress-strain diagram from a one-dimensional compression test. Incremental strains are integrated as the stress wave propagates downward to obtain the absolute free-field displacement at the elevation of the footings. Motion of the structure is represented by a single-degree-of-freedom analog. Empirical functions are used to represent footing reaction and arching in the model of the structure. These functions are incorporated in the differential equation of motion, which is solved with the aid of a digital computer. The results are compared with available test data; velocities and deflections agree reasonably well but the magnitude of the peak accelerations from the theory are larger than the corresponding measurements. Computations performed with the computer code indicate that surface loads above about 100 psi cannot be resisted if the maximum relative deflection between the footing and the floor slab is limited to 2 inches. (Author).
Book Synopsis Guide to Technical Documents by : Naval Civil Engineering Laboratory (Port Hueneme, Calif.)
Download or read book Guide to Technical Documents written by Naval Civil Engineering Laboratory (Port Hueneme, Calif.) and published by . This book was released on 1974 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Behavior of Strip and Spread Footings by : D. G. True
Download or read book Dynamic Behavior of Strip and Spread Footings written by D. G. True and published by . This book was released on 1970 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Abstract Bulletin by : Defense Documentation Center (U.S.)
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1967 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government-wide Index to Federal Research & Development Reports by :
Download or read book Government-wide Index to Federal Research & Development Reports written by and published by . This book was released on 1967 with total page 1352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development and Evaluation of Measurement Systems for Blast-Induced Motions in Buried Structures by : Stephen F. Pickett
Download or read book Development and Evaluation of Measurement Systems for Blast-Induced Motions in Buried Structures written by Stephen F. Pickett and published by . This book was released on 1974 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four types of transducers for measuring blast-induced motions in buried structures were developed and/or evaluated. Potentiometric linear displacement transducers were evaluated based on vendor-supplied data. Application techniques, load error analysis and vendor-suggested improvements were also studied. A gage for measuring relative structure/media interface (shear) displacement was designed, developed, and tested in the CERF 2- x 40-ft shock tube. This gage performed well over the low displacement range for which it was designed. A seismometer for simultaneously measuring absolute structural displacement and velocity was also designed, built, and tested. This transducer also performed well. The suitability of WES Air Force Modified (WAM) stress gages and Simmons concrete stress gages for measuring dynamic structure/media interface normal stress was tested in the CERF 2- x 4-ft shock tube. During this test program unexpected results were obtained because of reverberations in the test configuration. Although the results were useful, the data were not adequate for a complete evaluation of these gages. (Author).
Book Synopsis Influence of Soil Modulus on the Behavior of Cylinders Buried in Sand by : Jay R. Allgood
Download or read book Influence of Soil Modulus on the Behavior of Cylinders Buried in Sand written by Jay R. Allgood and published by . This book was released on 1968 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental and theoretical results are given that provide information on the influence of soil properties on the behavior of buried cylinders whose axes are parallel to the surface. Sand type, sand density, and cylinder stiffness were varied in 12 static tests on 5-inch-diameter thin-metal cylinders. The stiffness of these cylinders was less than that of others in the literature for which complete information on soil properties was available. The main contribution of the research presented is that it provides a unified method for determining deflections and the critical buckling load, both of which are based on the one-dimensional confined compression modulus measured in a standard laboratory test. This has not been done heretofore. Also, a relation for arching across buried cylinders is given which permits computation of the thrust at the haunches. Another feature of the work is the development of a matrix solution for determining the interface pressure distribution from measurements of strains in the cylinder. Thus, in effect, the cylinders can be used as biaxial soil pressure sensors. (Author).
Book Synopsis U. S. Government Research and Development Reports by :
Download or read book U. S. Government Research and Development Reports written by and published by . This book was released on 1967-10 with total page 1178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summary of Soil-structure Interaction by : Jay R. Allgood
Download or read book Summary of Soil-structure Interaction written by Jay R. Allgood and published by . This book was released on 1972 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report summarizes currently available knowledge of soil-structure interaction as it pertains to facilities that provide protection from nuclear weapons effects. The major subdivisions of the subject are discussed in sufficient detail to convey a general understanding of the subject and to provide key references. The recommended design methodology is illustrated for the horizontally oriented buried cylinder. A parallel approach is suggested for buried structures of other configurations. It is suggested that analysis of resulting designs be accomplished by the finite element method. Illustrations of two-dimensional and three-dimensional solutions by this method are given. (Author).
Book Synopsis U.S. Government Research & Development Reports by :
Download or read book U.S. Government Research & Development Reports written by and published by . This book was released on 1967 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Report written by and published by . This book was released on 1963 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1992-03 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government-wide Index to Federal Research & Development Reports by :
Download or read book Government-wide Index to Federal Research & Development Reports written by and published by . This book was released on 1967 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1967 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Scientific and Industrial Reports by :
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1967-11 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Blast Loading of Small Buried Arches by : Jay R. Allgood
Download or read book Blast Loading of Small Buried Arches written by Jay R. Allgood and published by . This book was released on 1963 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
