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RCED-84-87 1 (1984-02-17)

handle is hein.gao/gaobabngi0001 and id is 1 raw text is: UNITED STATES GENERAL ACCOUNTING OFFICE WASHINGTON, D.C. 20648 RESOURCES, COMMUNITY, AND ECONOMIC DEVELOPMENT DIVISION B-2 14229 FEBRUARY 17, 1984IAII111li 123436 The Honorable John 0. Marsh, Jr. The Secretary of the Army Dear Mr. Secretary: Subject: Thermal Analysis of Mass Concrete Structures: Lock & Dam No. 26 (Replacement) Project (GAO/RCED-84-87) During our survey of the U.S. Army Corps of Engineers Lock & Dam No. 26 (Replacement). Project, we noted that Corps design engineers were using outdated thermal analysis techniques in attempting to predict temperature distribution and resulting thermal stresses in the mass concrete to be used in this proj- ect. The thermal analysis techniques being used are based on methodology and programs developed about 15 years ago. State- of-the-art finite element computer programs which aid in pre- dicting the potential location of cracks from thermal stresses in mass concrete structures are currently used by large consult- ing engineering firms and federal agencies, such as the Nuclear Regulatory Commission and the Bureau of Reclamation, U.S. Department of the Interior, in designing concrete structures. Corps officials acknowledged that the Corps lacks experience in the use of state-of-the-art thermal analysis programs. Dr. Manohar Singh of our office brought these observations (details are included in enclosure I) to the attention of Corps officials in the Office of the Chief of Engineers, the Director- ate of Research and Development, the Waterways Experimentation Station, and various division and district offices. The offi- cials contacted acknowledged their lack of experience in the use of state-of-the-art thermal analysis programs. As a result the Corps, in September 1983, began consultations with Bureau of Reclamation officials on their experiences with finite element programs for thermal analysis of concrete structures. Also, Corps officials advised us that based on our observations, a 4-year (fiscal years 1984-87) research and development program has been initiated for the study of concrete cracking. The estimated cost for this program is about $510,000. (085678)

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