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Journal articles on the topic 'CFFT'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Ozbakkloglu, Togay. "Concrete-Filled FRP Tubes: New Forms for Improved Confinement Effectiveness." Applied Mechanics and Materials 256-259 (December 2012): 657–61. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.657.

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This paper reports on the development and testing of a new concrete-filled fiber reinforced polymer (FRP) tube (CFFT) system. The CFFT system was designed to enhance the effectiveness of rectangular FRP tubes in confining concrete. The technique used in the development of the CFFT system involved the incorporation of an internal FRP panel as an integral part of the CFFT. The performance of the system was investigated experimentally through axial compression tests of six unique CFFTs. The results of the experimental study indicate that the new CFFT system presented in this paper offer significa

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2

Nelson, Mark, Yu Ching Lai, and Amir Fam. "Moment Connection of Concrete-Filled Fiber Reinforced Polymer Tubes by Direct Embedment into Footings." Advances in Structural Engineering 11, no. 5 (2008): 537–47. http://dx.doi.org/10.1260/136943308786412023.

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A moment connection of concrete-filled fibre reinforced polymer (FRP) tubes (CFFTs) to concrete footing is explored. The CFFTs are directly embedded into the footings to develop their full moment capacity, in lieu of using mechanical connections, dowel reinforcing bars, or posttensioning methods. CFFT specimens of 219 mm diameter (D) were embedded into footings, at various depths, ranging from 0.3D to 1.5D. The CFFT cantilevered specimens were then laterally loaded to failure. The objective was to establish the critical embedment length, which was found to be 0.73D. Shorter embedment lengths r

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3

El-Zefzafy, Hend, Hamdy M. Mohamed, and Radhouane Masmoudi. "Evaluation Effects of the Short- and Long-Term Freeze-Thaw Exposure on the Axial Behavior of Concrete-Filled Glass Fiber-Reinforced-Polymer Tubes." Journal of Composites 2013 (October 30, 2013): 1–10. http://dx.doi.org/10.1155/2013/340672.

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Previous studies have demonstrated the high performance of the concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) as a stay-in-place formwork and confining material for concrete structures. However, there are several concerns related to the behavior of CFFT as a protective jacket against harsh environmental effects. The environmental effects such as freeze-thaw cycles and deicing salt solutions may affect materials properties, which may affect the structural response of CFFT members as well. This paper presents the test results of experimental investigation on the durability of short

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4

Fam, Amir, and Britton Cole. "Tests on reinforced-concrete-filled, fiber-reinforced-polymer circular tubes of different shear spans." Canadian Journal of Civil Engineering 34, no. 3 (2007): 311–22. http://dx.doi.org/10.1139/l06-104.

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This study examines the shear behavior of concrete-filled glass-fiber-reinforced-polymer (GFRP) tubes (CFFTs) reinforced with either steel or fiber-reinforced-polymer (FRP) longitudinal rebar. To evaluate the contribution of the GFRP tubes, control specimens with and without steel spirals, instead of the tubes, were also tested. Shear span-to-depth ratios (a/D) of 1 and 2 were considered in 14 three-point bending tests. CFFT specimens with a/D = 1 failed in shear by diagonal tension failure of the concrete core and tube, whereas those with a/D = 2 failed mostly in flexure. Control specimens fa

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5

Kang, In-Kyu, and Sun-Hee Kim. "Compressive Strength Testing of Hybrid Concrete-Filled Fiber-Reinforced Plastic Tubes Confined by Filament Winding." Applied Sciences 11, no. 7 (2021): 2900. http://dx.doi.org/10.3390/app11072900.

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In this study, an experiment on compressive strength of the hybrid concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) confined by filament winding was conducted to improve the longitudinal strength while considering the thickness of filament winding as a variable. A maximum error of 17% was observed when the results of performing the finite element analysis (FEA) by applying the mechanical properties of the fiber-reinforced polymer (FRP) materials suggested in previous studies were compared to those of the compressive strength experiment on the hybrid-CFFT. Moreover, a maximum error of

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6

Vincent, Thomas, and Togay Ozbakkaloglu. "Lateral Strain-to-Axial Strain Model for Laterally Prestressed Concrete-Filled FRP Tubes." Key Engineering Materials 729 (February 2017): 134–38. http://dx.doi.org/10.4028/www.scientific.net/kem.729.134.

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Concrete-filled FRP tube (CFFT) columns have recently gained significant research attention, with a number of experimental studies identifying significant benefits of using high-strength concrete (HSC) to produce high-performance CFFT columns. A recent experimental investigation revealed that prestressing the fibers in the fiber reinforced polymer (FRP) confining shell leads to significant improvements in the axial compressive behavior of HSC-CFFTs. This paper reports the findings from an analytical investigation into the lateral strain-to-axial strain relationship for prestressed HSC-CFFTs. T

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7

Wang, Xiao Lu, and Xiao Xiong Zha. "Experimental Research on Concrete-Filled GFRP Tubes and GFRP-Steel Composite Tubes under Axial Compressive Load." Advanced Materials Research 163-167 (December 2010): 2052–55. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.2052.

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Axial compression experiments of eighteen concrete-filled GFRP tube (CFFT) and concrete-filled GFRP reinforced steel tube (CFFST) specimens in total have been carried out to study their mechanical behaviors. Experimental results show that, GFRP tubes with different filament-wound angles could enhance the strength and ductility of core concrete at different levels. Fibers with hoop directions provide the best confinement and enhance the ultimate strength up to 266% comparing with unconfined concrete columns. Fibers with ±45° winding angles have minor effects on bearing capacity, but greatly imp

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Helmi, Karim, Amir Fam, Aftab Mufti, and J. Michael Hall. "Effects of driving forces and bending fatigue on structural performance of a novel concrete-filled fibre-reinforced-polymer tube flexural pile." Canadian Journal of Civil Engineering 33, no. 6 (2006): 683–91. http://dx.doi.org/10.1139/l05-075.

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The effects of driving forces and high-cycle fatigue on the flexural performance of a novel pile consisting of a concrete-filled glass-fibre-reinforced polymer (GFRP) tube (CFFT) are investigated. A 367 mm diameter CFFT pile was driven and then extracted from the ground. Two 6 m segments cut from the upper and lower ends of the pile were tested to failure under monotonic bending and compared with a similar undriven CFFT pile. In addition, a 625 mm diameter CFFT and a conventional 508 mm square prestressed concrete pile of similar moment capacities, both 13.1 m long, were driven, tested in the

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9

Pandey, Deepak, Hemant Kumar Chaudhari, Shesh Raman Upadhyay, et al. "Participatory on-farm evaluation of wheat genotypes." Journal of Agriculture and Natural Resources 2, no. 1 (2019): 312–21. http://dx.doi.org/10.3126/janr.v2i1.26096.

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In wheat development programs, the evaluation and identification of superior genotypes is the first and leading step in a crop improvement program. Coordinated Farmer’s Field Trial (CFFT) was conducted during the three successive wheat growing season of 2010/11, 2011/12 and 2012/13. In CFFT six different wheat genotypes were planted in different outreach sites of research stations of Nepal Agricultural Research Council (NARC) at varying geographical regions. CFFT was conducted according to standard recommended practices of wheat at farmers’ field with different sets of genotypes for Terai and

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10

Joo, Hyung Joong, Seung Sik Lee, Soon Jong Yoon, Ju Kyung Park, and Kwang Yeoul Shin. "Development of Hybrid FRP-Concrete Composite Compression Members." Advanced Materials Research 26-28 (October 2007): 329–32. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.329.

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The concrete-filled steel tubes have been widely used in buildings and civil structures. However the corrosion of the steel tubes results in the loss of load carrying capacities of the members and, therefore, there is a need for regular maintenance. To mitigate such maintenance issues and prevent the loss of load carrying capacity, FRP composite were suggested as the candidate material. A number of research works has shown that the use of FRP tubes produced by filament winding technique was very effective on the improvement of compressive strength of the concrete-filled FRP tubes (CFFT). Howev

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11

Shrestha, Jiban, Keshab B. Koirala, Ram B. Katuwal, et al. "Performance evaluation of quality protein maize genotypes across various maize production agro ecologies of Nepal." Journal of Maize Research and Development 1, no. 1 (2015): 21–27. http://dx.doi.org/10.3126/jmrd.v1i1.14241.

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To identify superior quality protein maize genotypes for grain yield under different agro climatic conditions of terai and hill districts in Nepal, the coordinated varietal trials (CVT) were conducted at Dailekh, Doti, Salyan, Lumle and Pakhribas in 2013 and Salyan, Pakhribas and Kabre in 2014 during summer season and coordinated farmer’s field trials (CFFT) at Surkhet and Dailekh in 2013 and Salyan, Pakhribas and Khumaltar in 2014 during summer season. The experiment was carried out using randomized complete block design with three replications for CVT and CFFT. Across the locations and years

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12

Louk Fanggi, Butje Alfonsius, and Togay Ozbakkaloglu. "Relative Performance of FRP-Concrete-Steel Double Skin Tubular Columns versus Solid and Hollow Concrete-Filled FRP Tubes." Applied Mechanics and Materials 501-504 (January 2014): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.3.

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This paper reports on part of an ongoing experimental program at the University of Adelaide on FRP-concrete-steel composite columns. The results from twenty specimens including 12 double skin tubular columns (DSTCs), two solid concrete-filled fiber reinforced polymer (FRP) tubes (CFFTs), and six CFFTs with inner voids (H-CFFTs) are presented. The specimens were manufactured using high-strength concrete (HSC) and their FRP tubes were fabricated using unidirectional S-glass fiber sheets. The results of the experimental study indicate that that H-CFFTs perform significantly worse than DSTCs and C

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13

Ahmed, Asmaa, and Radhouane Masmoudi. "Axial Response of Concrete-Filled FRP Tube (CFFT) Columns with Internal Bars." Journal of Composites Science 2, no. 4 (2018): 57. http://dx.doi.org/10.3390/jcs2040057.

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This paper aims at investigating the general axial behavior of long circular concrete-filled, fiber-reinforced polymer (FRP) tube (CFFT) columns internally reinforced with different longitudinal rebars. A total of seven CFFT and three reinforced concrete (RC) columns served as control specimens for comparisons and were constructed and tested under cyclic axial loading until failure. The test parameters were: (1) internal reinforcement type (steel, glass fiber-reinforced polymer (GFRP) or carbon fiber-reinforced polymer (CFRP)) and amount; (2) GFRP tube thicknesses; and (3) nature of loading. A

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14

Vincent, Thomas, and Togay Ozbakkloglu. "The Effect of Confinement Method and Specimen End Condition on Behavior of FRP-Confined Concrete under Concentric Compression." Applied Mechanics and Materials 351-352 (August 2013): 650–53. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.650.

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This paper presents an experimental investigation on the influence of confinement method and specimen end condition on axial compressive behavior of fiber reinforced polymer (FRP)-confined concrete. A total of 12 aramid FRP (AFRP)-confined concrete specimens with circular cross-sections were tested. Half of these specimens were manufactured as concrete-filled FRP tubes (CFFTs) and the remaining half were FRP-wrapped concrete cylinders. The effect of specimen end condition was examined on both CFFTs and FRP-wrapped specimens. This parameter was selected to study the influence of loading the FRP

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15

Ho, J. C. M., X. L. Ou, M. T. Chen, Q. Wang, and M. H. Lai. "A path dependent constitutive model for CFFT column." Engineering Structures 210 (May 2020): 110367. http://dx.doi.org/10.1016/j.engstruct.2020.110367.

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16

Vincent, Thomas, and Togay Ozbakkaloglu. "Variation of Hoop Strains in Concrete-Filled FRP Tubes with Concrete Strength, Amount of Confinement and Specimen Slenderness." Applied Mechanics and Materials 501-504 (January 2014): 977–82. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.977.

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This paper presents an experimental investigation on the variation of FRP hoop strains around specimen perimeter and along specimen height. A total of 24 concrete-filled fiber reinforced polymer (FRP) tubes (CFFTs) with circular cross-sections were tested under monotonic axial compression. The CFFT specimens were instrumented with numerous lateral strain gauges attached to the FRP tubes to examine the development of hoop strains along the specimen height and around specimen perimeter. Specimens were manufactured with height-to-diameter ratios (H/D) of 2 or 5, with all specimens maintaining a n

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17

Shrestha, Jiban. "Evaluation of Quality Protein Maize Genotypes for Grain Yield in Mid Hill Districts of Nepal." International Journal of Life Sciences 10, no. 1 (2016): 7–9. http://dx.doi.org/10.3126/ijls.v10i1.14514.

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The present study pertaining to the identification of high yielding quality protein maize genotypes was conducted under coordinated varietal trials (CVT) at Khumaltar (Lalitpur) and Kabre (Dolakha) from 2011 to 2012 summer season and under coordinated farmers' field trials (CFFT) at Lumle (Kaski), Kimugaun (Dailekh) and Kabre (Dolakha) in 2011 summer season and at Dailekh and Kabre in 2012 summer season. The results of these trials showed that the genotypes namely Obatanpa followed by S99TLWQ-B and S01SIYQ produced the highest grain yield under coordinated varietal trials and genotypes namely

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18

Idris, Yunita, and Togay Ozbakkloglu. "Behavior of High-Strength Concrete-Filled FRP Tube Columns under Simulated Seismic Loading: An Experimental Study." Advanced Materials Research 743 (August 2013): 39–44. http://dx.doi.org/10.4028/www.scientific.net/amr.743.39.

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This paper reports on part of an ongoing experimental program at The University of Adelaide on the seismic behavior of high-strength concrete (HSC)-filled fiber reinforced polymer (FRP) tubes (HSCFFTs). The results from three square concrete-filled FRP tube (CFFT) columns that were tested under combined constant axial compression and reversed-cyclic lateral loading are presented. The main parameters of the experimental study included the axial load level, concrete strength, and FRP tube corner radius. The results indicate that square HSCFFT columns are capable of developing very high inelastic

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19

Okino, M., and Y. Higashi. "Measurement of seabed topography by multibeam sonar using CFFT." IEEE Journal of Oceanic Engineering 11, no. 4 (1986): 474–79. http://dx.doi.org/10.1109/joe.1986.1145209.

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20

Gao, Chang, Liang Huang, Libo Yan, Gao Ma, and Liwen Xu. "Compressive behavior of CFFT with inner steel wire mesh." Composite Structures 133 (December 2015): 322–30. http://dx.doi.org/10.1016/j.compstruct.2015.07.075.

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21

Wang, Song, and Mohamed A. ElGawady. "Effects of combined environmental exposures and axial load on CFFT." Construction and Building Materials 184 (September 2018): 524–35. http://dx.doi.org/10.1016/j.conbuildmat.2018.06.222.

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22

Choi, Jin-Woo, Joon-Seok Park, Jung-Hoon Nam, Dong-Jun An, In-Kyu Kang, and Soon-Jong Yoon. "An Experimental Study for the Compression Strength of Hybrid CFFT Pile." Journal of the Korean Society for Advanced Composite Structures 2, no. 1 (2011): 30–39. http://dx.doi.org/10.11004/kosacs.2011.2.1.030.

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23

Yadav, Bisheswar Prasad, Santosh Rasaily, Pramod Wagle, et al. "Evaluation and Release of High Yielding and High Oil Containing Mustard for Terai and Inner Terai of Nepal." International Journal of Applied Sciences and Biotechnology 8, no. 4 (2020): 454–56. http://dx.doi.org/10.3126/ijasbt.v8i4.33825.

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In Recent years, cultivation of Mustard (Brassica juncea) is growing popularity but there is lack of suitable high yielding and oil contenting variety in Nepal. With Objective of identifying and releasing of high yielding variety, evaluation of exotic genotypes were done in the research field and farmers field. Coordinated Varietal Trial (CVT) was conducted for three years in three different location (Nawalpur, parwanipur and Khajura) in RCBD design. 4 Elite genotypes were selected and further evaluate under Coordinated Farmer Field Trial (CFFT) for 5 years where each farmer was considered as

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24

Echevarria, Alicia, Arash Zaghi, Richard Christenson, and Rachel Plank. "Residual Axial Capacity Comparison of CFFT and RC Bridge Columns after Fire." Polymers 7, no. 5 (2015): 876–95. http://dx.doi.org/10.3390/polym7050876.

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Khan, Qasim S., M. Neaz Sheikh, and Muhammad N. S. Hadi. "Axial compressive behaviour of circular CFFT: Experimental database and design-oriented model." Steel and Composite Structures 21, no. 4 (2016): 921–47. http://dx.doi.org/10.12989/scs.2016.21.4.921.

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Sirisha, G., and Shovan P. "Effect of agomelatine on psychomotor function tests in healthy human volunteers." International Journal of Basic & Clinical Pharmacology 7, no. 1 (2017): 109. http://dx.doi.org/10.18203/2319-2003.ijbcp20175684.

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Background: Agomelatine is a melatonergic agonist that acts specifically on MT1/MT2 melatonergic receptors and 5-HT2C antagonism. The present study was taken up to evaluate the effect of Agomelatine 25mg on psychomotor function in healthy human volunteers.Methods: The effect of Agomelatine was studied in 12 healthy volunteers of either gender. The study was a randomised, cross over, placebo controlled study, done after obtaining permission from NIMS Institutional Ethics Committee and informed consent taken from all the subjects, after briefly explaining the study procedure and training them ad

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27

Kern, C., A. Weber, C. Aurilio, and A. Forster. "Patient Evaluation and Comparison of the Recovery Profile between Propofol and Thiopentone as Induction Agents in Day Surgery." Anaesthesia and Intensive Care 26, no. 3 (1998): 156–61. http://dx.doi.org/10.1177/0310057x9802600301.

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The patient's subjective perception of the quality of his/her recovery after day case anaesthesia with propofol or thiopentone as induction agents is still controversial. The authors investigated the perception and quality of awakening after anaesthesia during the recovery period and at 24 hours and 72 hours, in outpatients undergoing anaesthesia induced either with propofol or thiopentone and maintained with a volatile anaesthetic. In a double-blind study in adults undergoing knee arthroscopy in a day surgery unit, propofol and thiopentone were compared as induction agents in 60 randomized ou

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28

Khan, Qasim S., M. Neaz Sheikh, and Muhammad N. S. Hadi. "Axial-Flexural Interactions of GFRP-CFFT Columns with and without Reinforcing GFRP Bars." Journal of Composites for Construction 21, no. 3 (2017): 04016109. http://dx.doi.org/10.1061/(asce)cc.1943-5614.0000771.

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29

Khan, Qasim S., M. Neaz Sheikh, and Muhammad N. S. Hadi. "Experimental results of circular FRP tube confined concrete (CFFT) and comparison with analytical models." Journal of Building Engineering 29 (May 2020): 101157. http://dx.doi.org/10.1016/j.jobe.2019.101157.

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30

Bellon, P. L., and S. Lanzavecchia. "CFFT: a package of tools for Fourier analysis, written in C for UNIX machines." Journal of Applied Crystallography 22, no. 3 (1989): 294. http://dx.doi.org/10.1107/s0021889888014785.

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31

Abdallah, Maha Hussein, Hamdy M. Mohamed, Radhouane Masmoudi, and Ahmed Moussa. "Experimental evaluation and theoretical analysis of the effective flexural stiffness of reinforced CFFT columns." Engineering Structures 175 (November 2018): 155–67. http://dx.doi.org/10.1016/j.engstruct.2018.08.019.

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Hain, Alexandra, and Arash E. Zaghi. "Experimental investigation of a simple shear connection to concrete-filled FRP tube (CFFT) columns." Engineering Structures 247 (November 2021): 113174. http://dx.doi.org/10.1016/j.engstruct.2021.113174.

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Huang, Yong, Hui Li, Xin Yan, and Jin Ping Ou. "Fractal Theory Based Damage Assessing Method of Acoustic Emission Test." Key Engineering Materials 413-414 (June 2009): 335–42. http://dx.doi.org/10.4028/www.scientific.net/kem.413-414.335.

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Acoustic emission (AE) test monitoring is an effective non-destructive technique. In the paper, a new damage assessing method which is damage acuteness index for AE signal of PZT patches based on fractal theory was proposed. The damage index was deduced by the character of signal analysed by fractal theory. It is deduced that both the curve length and the fractal dimension (FD) of signal are related with damage development. The AE test of Pseudo-static experiment of a concrete-filled GFRP tubes (CFFT) was performed for validation. The results show that the damage acuteness index can assess dam

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34

Zhu, Zhenyu, Iftekhar Ahmad, and Amir Mirmiran. "Effect of Column Parameters on Axial Compression Behavior of Concrete-Filled FRP Tubes." Advances in Structural Engineering 8, no. 4 (2005): 443–49. http://dx.doi.org/10.1260/136943305774353098.

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Axial compression tests have shown fiber reinforced polymer (FRP) tubes to significantly enhance both strength and ductility of concrete columns. However, most experiments and associated models typically do not account for the internal reinforcement, size effect of the column, and the end load-bearing conditions of the tube. An experimental program was undertaken to evaluate the effect of these parameters on the performance of CFFT columns. Glass FRP tubes filled with plain, steel-reinforced, and glass FRP-reinforced concrete were tested with and without end grooves, which would prevent the tu

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Vicente-Rodríguez, Marta, Juan Pedro Fuentes-Garcia, and Vicente Javier Clemente-Suárez. "Psychophysiological Stress Response in an Underwater Evacuation Training." International Journal of Environmental Research and Public Health 17, no. 7 (2020): 2307. http://dx.doi.org/10.3390/ijerph17072307.

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Background: This research aimed to analyze the psychophysiological stress response of air crews in an underwater evacuation training. Materials and Methods: We analyzed in 36 participants (39.06 ± 9.01 years) modifications in the rating of perceived exertion (RPE), subjective stress perception (SSP), heart rate (HR), blood oxygen saturation (BOS), cortical arousal (critical flicker fusion threshold, CFFT), heart rate variability (HRV), spirometry, isometric hand strength (IHS), and short-term memory (ST-M) before and after an underwater evacuation training. Results: The maneuver produced a sig

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Echevarria, Alicia, Arash E. Zaghi, Vincent Chiarito, Richard Christenson, and Stanley Woodson. "Experimental Comparison of the Performance and Residual Capacity of CFFT and RC Bridge Columns Subjected to Blasts." Journal of Bridge Engineering 21, no. 1 (2016): 04015026. http://dx.doi.org/10.1061/(asce)be.1943-5592.0000762.

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Khan, Qasim S., M. Neaz Sheikh, and Muhammad N. S. Hadi. "Concrete Filled Carbon FRP Tube (CFRP-CFFT) columns with and without CFRP reinforcing bars: Axial-flexural interactions." Composites Part B: Engineering 133 (January 2018): 42–52. http://dx.doi.org/10.1016/j.compositesb.2017.09.025.

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Park, Joon Seok, In Kyu Kang, Jong Hwa Park, Joo Kyung Park, Hong Taek Kim, and Soon Jong Yoon. "An Experimental Investigation on the Structural Behavior of FRP-Concrete Composite Compression Members." Materials Science Forum 654-656 (June 2010): 2644–47. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2644.

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In construction industries, new construction materials are needed to overcome some problems associated with the use of conventional construction materials due to the change of environmental and social requirements. Accordingly, the requirements to be satisfied in the design of civil engineering structures are diversified. As a new construction material in the civil engineering industries, fiber reinforced polymeric plastic (FRP) has a superior corrosion resistance, high specific strength/stiffness, etc. Therefore, such properties can be used to mitigate the problems associated with the use of

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Ahmed, Asmaa Abdeldaim, Mohamed Hassan, Hamdy Mohamed, Ahmed Abouzied, and Radhouane Masmoudi. "Axial behavior of circular CFFT long columns internally reinforced with steel or carbon and glass FRP longitudinal bars." Engineering Structures 155 (January 2018): 267–78. http://dx.doi.org/10.1016/j.engstruct.2017.11.037.

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Vincent, Thomas, and Togay Ozbakkaloglu. "Predicting Strain Reduction Factor for Concrete-Filled FRP Tube Columns Incorporating Interface Gap and Prestress." Solid State Phenomena 263 (September 2017): 18–23. http://dx.doi.org/10.4028/www.scientific.net/ssp.263.18.

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This paper reports the findings from an analytical study into the influence of fiber reinforced polymer (FRP)-to-concrete interface gap and prestressed FRP tubes on strain reduction factor (kε) for concrete-filled FRP tube (CFFT) columns. A database that consists of a total of 45 aramid FRP- (AFRP) confined normal-and high-strength concrete (NSC and HSC) specimens with circular cross-sections is presented. All specimens were cylinders with a 152 mm diameter and 305 mm height, and their unconfined concrete strengths ranged from approximately 45 to 110 MPa. Analyses of the experimental databases

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Abdallah, Maha Hussein, Hamdy M. Mohamed, and Radhouane Masmoudi. "Experimental assessment and theoretical evaluation of axial behavior of short and slender CFFT columns reinforced with steel and CFRP bars." Construction and Building Materials 181 (August 2018): 535–50. http://dx.doi.org/10.1016/j.conbuildmat.2018.06.014.

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42

Donchev, Ted, Vineta Srebrenkoska, Diana Petkova, Mohammad Albkeirat, and Hikmatullah Akhundzada. "Behaviour of column constructed with FRP tubes filled with concrete." MATEC Web of Conferences 289 (2019): 04001. http://dx.doi.org/10.1051/matecconf/201928904001.

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This paper investigates the behaviour of Concrete-Filled FRP Tubes (CFFT) as columns. The experimental programme consists of preparing and testing one steel column acting as control sample and three columns made with GFRP. The GFRP tubes were produced by filament winding method where the amount and orientation of the fibres was changed. The tubes had dimensions of 1000x100 mm (length x diameter) and were filled with C25/30 concrete. The columns were tested under compression and the load was applied at a pace rate of 0.5 mm/min. It was found that the GFRP tubes can efficiently confine the concr

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Fang, C., M. S. Mohamed Ali, and A. H. Sheikh. "Experimental and numerical investigations on concrete filled carbon FRP tube (CFRP-CFFT) columns manufactured with ultra-high-performance fibre reinforced concrete." Composite Structures 239 (May 2020): 111982. http://dx.doi.org/10.1016/j.compstruct.2020.111982.

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Frank, Tamara M. "Temporal resolution in mesopelagic crustaceans." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 355, no. 1401 (2000): 1195–98. http://dx.doi.org/10.1098/rstb.2000.0666.

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Mesopelagic crustaceans occupy a dim–light environment that is similar to that of nocturnal insects. In a light–limited environment, the requirement for greater sensitivity may result in slower photoreceptor transduction and increased summation time. This should be reflected by a lower temporal resolution, as indicated by a lower critical flicker fusion frequency (CFF). Therefore, one would predict that the CFFs of mesopelagic organisms would be relatively low compared with those of their shallow–water relatives, just as nocturnal insects tend to have lower CFFs than diurnal insects. Using an

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Vincent, Thomas, and Togay Ozbakkloglu. "An Experimental Study on the Compressive Behavior of CFRP-Confined High- and Ultra High-Strength Concrete." Advanced Materials Research 671-674 (March 2013): 1860–64. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1860.

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It is well established that external confinement of concrete with fiber reinforced polymer (FRP) sheets results in significant improvements on the axial compressive behavior of concrete. This understanding has led to a large number of experimental studies being conducted over the last two decades. However, the majority of these studies have focused on normal strength concretes (NSC) with compressive strengths lower than 55 MPa, and studies on higher strength concretes have been very limited. This paper presents the results of an experimental study on the compressive behavior of FRP confined hi

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Vincent, Thomas, and Togay Ozbakkloglu. "Influence of FRP-to-Concrete Gap Effect on Axial Strains of FRP-Confined Concrete Columns." Advanced Materials Research 1119 (July 2015): 760–65. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.760.

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This paper reports on an experimental investigation on the influence of FRP-to-concrete interface gap, caused by concrete shrinkage, on axial compressive behavior of concrete-filled FRP tube (CFFT) columns. A total of 12 aramid FRP (AFRP)-confined concrete specimens with circular cross-sections were manufactured. 3 of these specimens were instrumented to monitor long term shrinkage strain development and the remaining 9 were tested under monotonic axial compression. The influence of concrete shrinkage was examined by applying a gap of up to 0.06 mm thickness at the FRP-to-concrete interface, s

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Vargas-Sánchez, R. D., D. Velásquez-Jiménez, G. R. Torrescano-Urrutia, et al. "ACTIVIDAD ANTIOXIDANTE TOTAL EN PECHUGA DE CODORNIZ JAPONESA (Coturnix coturnix japonica) ALIMENTADA CON UNA DIETA SUPLEMENTADA CON HONGOS COMESTIBLES." Biotecnia 20, no. 2 (2018): 43–50. http://dx.doi.org/10.18633/biotecnia.v20i2.605.

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La carne de codorniz japonesa (Coturnix coturnix japonica) se destina al consumo humano, por ello es importante mantener su calidad durante el almacenamiento. El objetivo fue evaluar la capacidad de la harina de Pleurotus ostreatus incluida en la dieta, para incrementar la actividad antioxidante total (AAT) de la carne. Para ello, se determinó el contenido de fenoles (CFT) y flavonoides totales (CFVT), así como actividad antiradical-DPPH• y ABTS•+, y poder reductor (PR) del extracto-acuoso de P. ostreatus (EAPO). Las codornices fueron alimentadas durante 35 días con tres dietas: control y supl

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Wang, Edward Shih-Tse, and Yun-Hsuan Chu. "How Social Norms Affect Consumer Intention to Purchase Certified Functional Foods: The Mediating Role of Perceived Effectiveness and Attitude." Foods 10, no. 6 (2021): 1151. http://dx.doi.org/10.3390/foods10061151.

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Certified functional foods (CFFs) are approved by relevant authorities because of demonstrable efficacy. However, social norms affect consumer perceptions regarding CFFs, and their attitudes toward CFFs remain unclear. Drawing on social influence theory, this study explored how social norms (i.e., descriptive and injunctive) affect consumer perceptions and willingness to purchase CFFs. Consumers of CFFs in Taiwan were invited to participate in this study, and 398 valid questionnaires were received. Collected data were assessed through structural equation modeling. The results revealed that des

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Mercer, Michele E., and Russell J. Adams. "Wavelength Effects on Critical Flicker Frequency in Human Infants." Perceptual and Motor Skills 68, no. 3_suppl (1989): 1083–87. http://dx.doi.org/10.2466/pms.1989.68.3c.1083.

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We examined 3-mo.-old human infants' ability to detect flicker in 454-nm blue and 627-nm red lights at 1.5 log cd/m2. Infants showed the same critical flicker frequency (CFF) to both wavelengths, suggesting that retinal cones mediate the detection of flicker at this luminance level. Infants' CFFs for chromatic stimuli were much lower than those reported for achromatic stimuli and also much lower than adults' CFFs tested under the same conditions.

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Deng, Jun, Yifeng Zheng, Yi Wang, Tonghua Liu, and Hui Li. "Study on Axial Compressive Capacity of FRP-Confined Concrete-Filled Steel Tubes and Its Comparisons with Other Composite Structural Systems." International Journal of Polymer Science 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/6272754.

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Concrete-filled steel tubular (CFST) columns have been widely used for constructions in recent decades because of their high axial strength. In CFSTs, however, steel tubes are susceptible to degradation due to corrosion, which results in the decrease of axial strength of CFSTs. To further improve the axial strength of CFST columns, carbon fiber reinforced polymer (CFRP) sheets and basalt fiber reinforced polymer (BFRP) sheets are applied to warp the CFSTs. This paper presents an experimental study on the axial compressive capacity of CFRP-confined CFSTs and BFRP-confined CFSTs, which verified

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