Flathau meyer (1 Ergebnisse)
Verlag: U. S. Army Corps of Engineers Engineer Waterways Experiment Station, Vicksburg, MS, 1966
- Softcover
- Erstausgabe
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Wraps. Zustand: Good. Presumed First Edition, First printing. [6], 15, [1], 5, [5[ pages. Figures. Formulae. References. Name of previous owner on front cover. This work was sponsored by the Defense Atomic Support Agency. W. J. Flathau was the Chief, Protective Structures Branch, Nuclear Weapons Effects Division, U. S. Army Engi…neer Waterways Experiment Station. The U.S. Army Corps of Engineers Waterways Experiment Station (WES) was created as a result of the tragedy of the 1927 Mississippi River flood, one of the most horrific floods in American history. The devastation affected seven states, but Mississippi, Louisiana, and Arkansas were hardest hit. Over 16 million acres were flooded, 162,000 homes damaged, and 9,000 homes completely destroyed. Congress established the WES in 1929 to provide research support for the Mississippi River and Tributaries Project, a vast flood control plan for the entire lower Mississippi valley. Even during its fledgling years, however, the organization began to fundamentally transform hydraulics research in the U.S. The WES laboratory complex has grown into the principal research, testing, and development facility of the Corps of Engineers. The complex of five laboratories supports in-depth studies of coastal engineering, dredging, earthquake engineering, geology, weapons effects, soil and rock mechanics, and more. The primary objective of this 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. Abstract : The objective of this study was to determine the response of semicircular, unreinforced concrete fixed-end arches of varying stiffness buried in dense dry sand when subjected to both static and dynamic loads. Two sets of three arches all having outside diameters of 12 in. were cast with one arch in each set having wall thicknesses of 1/2, 1, and 2 in. The maximum static ground surface overpressure applied was 550 psi, and the maximum dynamic overpressure was 270 psi. For most of the tests, the depth of sand over the crown of the arch was 2 in. The modes of response for the structures tested statically and dynamically were the same. However, only the 1/2-in. arch loaded statically collapsed. From strain measurements it was determined that the arches responded in compression. From the results it was possible to write expressions including the effects of soil arching for predicting overpressures to cause failure of the type arches described in this paper.