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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:
SP138-12
Date:
September 1, 1993
Author(s):
Tadashi Fujisaki, Teruyuki Nakatsuji, and Minoru Sugita
Publication:
Symposium Papers
Volume:
138
Abstract:
Grid-shaped FRP reinforcement has been developed to prevent deterioration of concrete structures owing to corrosion of reinforcement. This reinforcement is made of high-strength continuous fibers impregnated with resin and formed into a grid shape to insure bond with concrete. When this development was carried out, joint research and development with some universities as well as a Japanese technological development project was conducted to clarify fundamental properties of this reinforcement and structural behavior of reinforced concrete members. Applications of this reinforcement to actual structures began with such civil engineering structures as tunnels, LPG tanks, etc. In Japan, applications of advanced composite materials to building structures require governmental approval. Therefore, to apply this reinforcement to precast concrete curtain walls, heat-resistance and fire-resistance tests were conducted to obtain the approval of the Minister of Construction. This is the first time that FRP reinforcement was used in Japanese building structures. Application of this reinforcement to box-framed reinforced concrete structures will be considered next.
DOI:
10.14359/4238
SP138-13
A. Nanni, M.S. Norris, and N.M. Bradford
Lateral confinement of concrete members by means of spirally wrapping fiber-reinforced-plastic (FRP) composites onto the concrete surface may increase compressive strength and ultimate strain (pseudo-ductility). It may also provide a mechanism for shear resistance, and inhibit longitudinal steel reinforcement buckling. Lateral confinement of concrete members as a strengthening/repair technology is expected to have an impact in the rehabilitation/renovation of buildings and infrastructure. Structures that have been damaged, or need to comply with new code requirements, or are subjected to more severe usage are the primary targets. In this project, an experimental and analytical study of concrete strengthened with FRP lateral confinement I conducted using compression cylinders (300 and 600 mm in length) and l/4 scale column-type specimens. The latter specimens have a circular cross section and given longitudinal/transverse steel reinforcement characteristics. Column-type specimens are subjected to cyclic flexure with and without axial compression. When an aramid FRP tape is used as the lateral reinforcement, the variables are tape area and spiral pitch. In the case of filament winding with glass fiber, the thickness of the FRP shell is varied. The limited experimental results obtained at this stage of the research program indicate that lateral confinement significantly increases compressive strength and pseudoductility under uniaxial compression.
10.14359/10035
SP138-26
T. Kato and N. Hayashida
This paper reports on the effects of improvement in flexural characteristics and deformability(ductility) when using unbonded CFRP(Carbon Fiber Reinforced Plastic) tendons in prestressed concrete (PC) beams and bending fatigue characteristics of bonded type PC beams with CFRP tendons. Based on the results of flexural loading experiments, with PC beams using unbonded CFRP tendons, failure modes shifted from CFRP tendons rupture type to concrete crushing type. while deformation at the ultimate stage was also changed greatly for the better. It was also succeeded in ascertaining that effective prestressing force, and tensile reinforcement quantity and variety are influential as factors increasing deformability at the ultimate stage. Further, as the result of bending fatigue tests of bonded type PC beams with CFRP tendons, it was confirmed that reduction in ultimate flexural loads of bonded type PC beams due to repetitive loading was not seen and bending fatigue properties were favorable.
10.14359/10036
SP138-46
T. Kanakubu, K. Yonemaru, H. Fukuyama, M. Fujisawa, and Y. Sonobe
An experimental program consisting of three series of tests was conducted to investigate the bond performance of concrete members reinforced with FRP bars. First, a simple bond test was performed using several types of FRP bars. This test was carried out by pulling out a single bar located near the surface of the concrete block. The test objectives were to evaluate the bond splitting strength of FRP reinforced concrete without lateral reinforcement and to establish a standard test method for bond splitting. Test results show that the bond splitting strength can be estimated using the ratio of lug height to diameter of FRP bars. In the second test, a bond splitting test was conducted on cantilever-type specimens. These were modeled to exhibit a stress condition similar to an actual structure. The test objectives were to study the results of the simple bond test and evaluate the increment of the bond splitting strength caused by lateral reinforcement. From the test results, the tendency of the bond splitting strength without lateral reinforcement is equal to that obtained from the first test. The increment of the strength caused by lateral reinforcement can be evaluated in terms of its percentage and elastic modulus. Finally, an antisymmetrical loading test for actual beams reinforced with FRP bars was carried out. The bond performance obtained for the longitudinal bars shows a good correlation with the results obtained from the former two tests.
10.14359/3956
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
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