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Topics In Concrete
Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 629 Abstracts search results
Document:
22-267
Date:
March 24, 2025
Author(s):
Zihao Shen and Wenguang Liu
Publication:
Materials Journal
Abstract:
To constitute an alternative to ordinary fiber-reinforced polymer in the strengthening of existing structures, the tensile properties of polypropylene (PP) and polyethylene terephthalate (PET) fiber bundles in the outdoor thermal environment (80℃ and 105℃) were investigated. The fiber bundles were carefully removed from a woven textile and test specimens with a gauge length of 25 mm were fabricated. Based on the experiments, a Weibull distribution model of the tensile strength of the PP and PET fiber bundles was developed. Test results show that exposure temperature and time significantly affect the tensile strength, rupture strain, and elastic modulus of the PP and PET fiber bundles. The strength degradation of PP and PET fiber bundles is not obvious when exposed to 80℃. In contrast, on exposure to 105℃, The usage of them requires consideration of mechanical properties degradation. This study provides exact data for the use of PP and PET fiber bundles in outdoor thermal environments.
DOI:
10.14359/51746711
24-130
March 17, 2025
Linh Van Hong Bui, Hidehiko Sekiya, Boonchai Stitmannaithum
Structural Journal
There is a need to model the complete responses of shear-critical beams strengthened with embedded through-section (ETS) fiber-reinforced polymer (FRP) bars. Here, a strategy is proposed to integrate two separate approaches, flexural‒shear deformation theory (FSDT) for element fields and a bonding-based method for ETS strengthening, into a comprehensive computation algorithm through localized behavior at the main diagonal crack. The use of force- and stress-based solutions in the algorithm that couple fixed and updated shear crack angle conditions for analyzing the shear resistance of ETS bars is investigated. The primary benefit of the proposed approach compared to single FSDT or existing models is that member performance is estimated in both the pre-peak and post-peak loading regimes in terms of load, deflection, strain, and cracking characteristics. All equations in the developed model are transparent, based on mechanics, and supported by validated empirical expressions. The rationale and precision of the proposed model are comprehensively verified based on the results obtained for 46 datasets. Extensive investigation of the different bond‒slip and concrete tension laws strengthens the insightfulness and effectiveness of the model.
10.14359/51746674
24-029
Sayyed Ali Dadvar, Salaheldin Mousa, Hamdy M. Mohamed, Ammar Yahia, and Brahim Benmokrane
10.14359/51746672
24-009
March 1, 2025
S. Alshamrani, F. H. Salahat, H. A. Rasheed, G. Shapack, and M. T. Albahttiti
Volume:
122
Issue:
2
The behavior of carbon fiber-reinforced polymer (CFRP) flexurally strengthened reinforced concrete (RC) beams under reversed cyclic loading is not sufficiently studied. In this paper, normal-strength concrete is used with a typical steel ratio (0.5%) to build full-scale rectangular beams strengthened on top and bottom with flexural unanchored and anchored CFRP sheets. Five identical beams were examined under fully reversed cycles up to failure following the AC 125 displacement loading protocol. The first beam was tested as an unstrengthened control specimen. The second and third beams were tested as strengthened specimens using thin sheets with and without fiber anchors. On the other hand, the fourth and fifth beams were tested when strengthened using thick sheets with and without fiber anchors. Specimens with thin sheets underwent higher ductility and lower hysteresis pinching relative to the thick ones. The results are comparatively discussed and compared to a phenomenological cyclic analysis model showing promising correspondence.
10.14359/51744397
24-056
Camilo Vega, Abdeldjelil Belarbi, and Antonio Nanni
Design codes base the behavior of the shear-friction interface on two models: the basic shear friction model and the cohesion plus friction model. These models have been developed using steel as the reference reinforcing material and they have extended to design provisions when using glass fiber-reinforced polymer (GFRP) materials. However, when using GFRP reinforcement, where yielding does not happen, a different ultimate limit state needs to be introduced. Accordingly, additional data and analysis are required to validate and improve the proposed models and to verify what implications they have on design when specifying GFRP materials. In this research, a study was conducted based on previous experimental data on the contribution of GFRP bars to the mechanism of shear transfer by using the pushoff test. Through a multiple linear-regression analysis, a mathematical model introducing new parameters that accurately capture the behavior of this material with respect to shear-transfer phenomena in concrete structures is presented in this paper. The findings of this study provide new insights into the behavior of the shear-friction mechanism with GFRP reinforcement, suggesting potential updates for current design codes and guide specifications.
10.14359/51744398
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