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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 97 Abstracts search results
Document:
SP188-03
Date:
August 1, 1999
Author(s):
G. S. Kaski and C. W. Dolan
Publication:
Symposium Papers
Volume:
188
Abstract:
The long-term durability of FRP prestressing tendons in a harped configuration or in flexure under short radius bends has not been extensively investigated. Creep-rupture data for straight uniaxial tension testing may not be representative of the material behavior in a prestressing application requiring curvature of the tendon. The FRP response in a harped or bent configuration may be compromised due to a lack of ductility in the outer fibers of the tendon. Long-term creep-rupture experiments conducted on harped Carbon FRP tendons are reported. The tests are conducted in a bend test so outer fibers are stressed up to 88 percent of the uniaxial strength. All tests are conducted in air at nominal room temperature. This paper presents design information concerning the long-term performance of harped FRP tendons and coiled storage of FRP tendons.
DOI:
10.14359/5610
SP188-04
N. Matsumoto, T. Harada, and K. Yagi
Discussions on the evaluation and standardization of test methods to obtain the material properties of continuous fiber sheets, which is applied to the repair and strengthening of concrete structures, have been conducted from 1998 in a working party of a research committee in the Japan Society of Civil Engineers. Among the mechanical and durability test methods to be standardized, the current discussions on the tension and bond test methods are introduced in this paper. As for the tension test, a new method to make the specimen to cope with large-tow or thick-yarn continuous fiber sheet is proposed and is to be adopted as one of the standard specimens. The variation of strengths depending on the different test specimens is discussed based on test results and a numerical analysis. As for the bond test, many elaborate test methods have been proposed but the simplicity is regarded very important for design application. Then, a simple test method is proposed as the standard method and a simplified evaluation method on bond strength is introduced.
10.14359/5611
SP188-05
H. Blontrock, L. Taerwe, and S. Matthys
As part of a research project on “Fire resistance of concrete elements strengthened with externally bonded FRP reinforcement”, a synthesis report is presented on the influence of elevated temperatures on the thermal and mechanical properties of FRP materials and resins, and on the influence of elevated temperatures on the behaviour of the interface between concrete and FRP. Also a survey of the results of fire tests on FRP strengthened or reinforced concrete members is given.
10.14359/5612
SP188-06
S. Y. Park and A. E. Naaman
A mathematical failure analysis model was developed to predict the behavior and failure of FRP dowels subjected to tensile and shear forces. The model consists of two sub-models. To model dowel action, the beam on elastic foundation (BEF) model was adopted and modified by introducing two indices, namely a displacement level index to accommodate the concrete subgrade stiffness, and a tension index to accommodate the cable effect. The Tsai-Hill failure criterion, in which a failure factor was introduced, was used as the failure criterion for the dowels subjected to tensile and shear forces. The failure analysis model was used to predict the ultimate dowel shear force and corresponding displacement. Analytical predictions were compared with the test results of the CFRP dowel specimens and a good agreement was observed.
10.14359/5613
SP188-10
S. H. Alsayed, Y. A. Al-Salloum, T. H. Almusallam, and M. A. Amjad
A total of 15 concrete columns were cast and tested to investigate the influence of replacing longitudinal and/or tie steel bars by an equal volume of amount of glass fiber reinforced polymers (GFRP) bars on the behavior of concrete columns. The columns were subjected to concentric monotonic axial loading. The concrete block for all columns was 450 ¥ 250 ¥ 1200 mm. The results indicated that replacing the longitudinal steel bars by GFRP bars reduced the axial capacity of the column by 13%. The results also showed that regardless of the type of the longitudinal bars, replacing the steel ties by GFRP ties reduced the axial capacity of the column by 10%. However, the study revealed that replacing the steel ties by GFRP had, up to about 80% of the ultimate load, no influence on the load-axial shortening curve. Furthermore, the results indicated that the currently used ACI formula to estimate the axial capacity of the column overestimated the actual capacity of the column reinforced longitudinally and or transversely by GFRP bars.
10.14359/5614
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