Fayette County Leader from Fayette, Iowa on December 28, 1961 · Page 3
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Fayette County Leader from Fayette, Iowa · Page 3

Fayette, Iowa
Issue Date:
Thursday, December 28, 1961
Page 3
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Study effects of Bomb blasts on Underground shelters Truly a down-toearth research project is the study conducted at Iowa State University of the effects of bomb blasts on underground structures. The project bears a modest title, "A Study of Loads on Underground Structures." And in its in inal phase, the research is far from glamorous. Yet the informntion sought could have life and-death implications in case of nuclear warfare. The study was undertaken by the Engineering Experiment Station at Iowa State University for the Defense Atomic Support Agency of the U. S. Department of Defense. A number of other studies are being conducted in the United States for DASA and other government organizations, all related to protective shelters. Iowa State's project is concerned with the question. "How does soil transmit the blast load to the underground structure?" Dr. David A. Van Horn, associate professor of civil engineering who is project director, says all previous studies have dealt with the transmission of loads produced by foundations footings or by highway, railway or airplane traffic. Mathematical formulas have been derived, and experimental studies have been made which enable the computation of the effects of such loads. But, he explains, almost nothing is known of the soil's transmission of blast loads which are of a much higher magnitude and are time dependent. For example, pressure from a blast is exerted suddenly and powerfully but dimishes very rapidly as contrasted with the' static pressure of foundation footings. "Designers of underground facilities to resist blast pressures have only limited factual data upon which to base their designs. "We need to know if soil performs in the same way under extremely high stresses and whether the accepted formulas can be extended or modified for use under such extreme conditions." The Iowa State project is not concerned with fallout or extreme temperatures from blasts, but only with the pressure transmitted to underground structures in the immediate vicinity of a blast. The first objective is to collect, analyze and correlate all available information on static earth and super-imposed loads and stresses. At present, three men are checking and analyzing every reference In the University Library on transmission of static loads in soils. They are compiling a bibliography and abstracts of all available information on the subject, including the translation of foreign publications. To date, they have uncovered and abstracted about 300 references. When the bibliography has been completed, a critical evaluation and analysis will be made of the "state of the art" in the area of soil mechanics on the basis of published and in-progress research. An evaluation of the pertinent properties of soils, including stress transmission characteristics of soils, then will be developed. Finally, recommendations for further physical or analytical research will be made. Working with Dr. Van Horn are Merlin G. Spangler, civil engineering professor; Ti-Ta Lee, assistant professor of civil engineering; and graduate students in civil engineering, Robert Tener, Noblesvilte, Ind, Ming-chih Hsieh of Formosa and Gerald Herber, Sioux City. It is appropriate that Iowa State engineers should have been selected to make the soil study, for it was the late Anson Marston, dean of engineering at Iowa State, who developed the Marston Load Theory in 1922 that still is widely used throughout the world, and it was Prof, Spangler who continued the research and aided greatly in publishing the results. Men's Bowling Theatre; ...,——. Standard'Oil ....-—,-—37 Vandersee 34 RandaUa Cheese 31 Ott'8 Drive fa 29 Fireman 28 tegtoo ....„ 20 BUlft sq»r ydu .., M raS,,E. 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