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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 33 Abstracts search results
Document:
SP109-24
Date:
August 1, 1988
Author(s):
S. Nishibayashi, S. Inque ,and K. Yamura
Publication:
Symposium Papers
Volume:
109
Abstract:
Fatigue characteristics of concrete beams were determined under water and in air. Significant differences were observed in the fatigue strengths between the beams tested in water and those in air. The failure pattern of a reinforced concrete beam tested in water occurs as a shear failure but as flexural failure in air. At the same upper load level, the fatigue life of the beam with web reinforcement was approximately 100 times that of the beam without it. The flexural crack width of the specimen in water was lower than that exposed to air. At the same upper load level, however, the deflection and the rate of propagation of the diagonal crack were larger in air.
DOI:
10.14359/2061
SP109-29
T. W. R. Taylor and H. R. Woodhead
The Port of Vancouver, Canada, is the owner of one of the world's newest and most unique heliports. This state-of-the-art floating facility is constructed from styrofoam-filled cellular concrete. The analysis and design of the structure is developed in this paper. Some of the interesting aspects of construction are highlighted and the economic benefits of this use of reinforced concrete are discussed.
10.14359/3054
SP109-20
P. F. Adams, T. J. E. Zimmerman, and J. G. MacGregor
The exterior walls of arctic oil and gas production structures will be subject to large, concentrated ice forces. Composite steel/concrete walls have been proposed as a cost-effective solution to resisting these forces. The research discussed in this paper has investigated the behavior and failure mechanisms of composite walls, so that recommendations can be made concerning analysis and design methods and effective construction details. The research involved the development of design-oriented ultimate strength models, as well as the physical testing of composite wall specimens. Results are presented in this paper for tests on composite beam and composite slab specimens. The high strength and great ductility of this form of construction is demonstrated. Effective design methods utilizing empirical design equations and limit analysis plasticity solutions are given.
10.14359/3075
SP109-03
B. C. Gerwick, Jr. And D. Berner
Composite steel/concrete sandwich elements are being given intensive research and development efforts because of their excellent structural performance under intense concentrated loads, such as those imposed by sea ice or icebergs. Since the initial applications are expected to be in Arctic and sub-Arctic environments, consideration must be given to thermal phenomena and to insuring long-term durability. Thermal problems addressed include the effects of heat of hydration, with subsequent cooling, freeze-thaw behavior, differential contraction and strain gradients, and low-temperature ductility under impact. Durability problems addressed are corrosion of plates and reinforcement, abrasion and abrasion-corrosion interaction, and fatigue under the continuous crushing of ice. After examining the particular aspects of these considerations in relation to composite elements, recommendations for long-term satisfactory performance are developed as a guide for practical application.
10.14359/2804
SP109-14
J. E. McDonald and T. C. Liu
The U.S. Army Corps of Engineers currently operates and maintains 269 navigation lock chambers along inland and coastal waterways. Approximately one-half of these structures were built prior to 1940. Consequently, the concrete in these structures does not contain intentionally entrained air and is, therefore, susceptible to deterioration from cycles of freezing and thawing. In response to a need for improved technology in evaluation and repair of such structures, the Corps of Engineers initiated the Repair, Evaluation, Maintenance, and Rehabilitation (REMR) research program. The objective of this comprehensive program is to develop effective and affordable technology for prolonging the service life of existing civil works structures. Individual REMR research studies, which relate to the evaluation and repair of concrete in a marine environment, are described in this paper. Results to date indicate that techniques and equipment are available for underwater evaluation and repair of concrete structures without the necessity of dewatering.
10.14359/3598
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