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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 56 Abstracts search results
Document:
SP138-01
Date:
September 1, 1993
Author(s):
W. Reinold De Sitter and rene A. Vonk
Publication:
Symposium Papers
Volume:
138
Abstract:
In concrete pretensioned with nonmetallic fiber reinforced plastic reinforcement (FRPR), the Hoyer effect leads to high splitting stresses due to confinement of radial deformations of bars or strands in the transfer zone. Incompatible linear temperature expansion can aggravate the splitting stresses. Bond in the transfer zone is heavily influenced by the confined radial expansion, as demonstrated by tests with bars in lightweight concrete. Very short transfer lengths (80 mm) have been measured. Three calculation approaches for splitting stresses are presented: the elasto-plastic, concrete deformation, and fracture energy approaches. The elasto-plastic model has been checked using a discrete element model that includes tensile softening of concrete. The presented formulas are confirmed by several tests on pretensioned prisms.
DOI:
10.14359/3918
SP138-05
A. H. Rahman, D. A. Taylor, and C. Y. Kingsley
A comprehensive research program to investigate the suitability of a fiber reinforced plastic (FRP) for reinforced concrete is described. The investigation focuses on highway bridge decks and barrier walls. In determining the research needs, careful consideration has been given to the loads and environments to which highway bridges are subjected in northern North America. Short-term tension, creep, fatigue, and durability tests are being carried out on FRP specimens in the first phase of a three-phase program. Tests completed so far indicate a small yet noticeable change in strength and stiffness of FRP with change in temperature; small creep strain rates have been computed after 175 days of sustained loading, with satisfactory fatigue behavior under a tensile load cycling between 10 and 30 percent of the tensile strength.
10.14359/3919
SP138-06
H. Budelmann and F. S. Rostasy
FRP tensile elements exhibit the so-called creep rupture phenomenon when subjected to a high axial tensile stress. For this reason, the time of endurance until fracture that is dependent on the level of the permanent stress is the relation to be derived experimentally. The creep rupture phenomenon exists principally for all structural materials. However, experiments prove that for prestressing steel it is of no practical relevance: the usual permanent steel stresses that are in the range of 75 percent of characteristic tensile strength can be borne indefinitely without fracture or strength loss. However, this is not the case for FRP, whose stress rupture behavior is also influenced markedly by the micro-environment around the element and is dependent on the type of fiber and matrix employed. Paper presents an outline of the results known so far, the experimental techniques, methods of statistical evaluation, and forecast of the long-term behavior of specific FRP elements. It is shown that the characteristic stress rupture line is the essential basis for the derivation of the admissible permanent prestress of FRP tensile elements.
10.14359/3920
SP138-08
Shigeru Mochizuki, Yashuhiro Matsuzaki, and Minoru Sugita
In Japan, FRP reinforcement has been regarded as the substitute structural material for steel bars in reinforced concrete elements. The Architectural Institute of Japan (AIJ) has formed the Committee of Continuous Fiber Composite Material to address the need for use of FRP in the future. Paper concerns evaluating FRP and FRP reinforced concrete elements from a structural viewpoint. The evaluation of new materials such as FRP outside the parameters of standard building codes is difficult. It is also potentially dangerous to evaluate a new material according to conventional standards. Therefore, this paper encompasses the tendency of present research and standards, together with suggestions to promote the future use of FRP and FRP reinforced concrete elements.
10.14359/3921
SP138-09
E. Sueoka, K. Yasuoka, O. Kiyomiya, M. Yamada, M. Shikamori
For better durability and more rapid construction of reinforced concrete marine structures, the authors designed composite beams that consist of channel-shaped precast concrete forms reinforced with FRP and inner reinforced concrete. In this study, static flexural and shear tests were conducted to ascertain basic mechanical properties and estimate design methods of these types of beams. The flexural capacity coincided well with the values calculated by a conventional design method. The shear capacity was calculated on the conservative side by 20 to 30 percent by using the Niwa equation. No dislocation occurred between the form and inner concrete up to the level of the design load. However, dislocations were observed between them at shear stresses of more than 22 kgf/cm 2, and therefore shear connectors (studs) were needed for their prevention.
10.14359/3922
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