scholarly journals Performance Evaluation of CFRP Strengthened Corrosion-Proof Columns

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Mohammadamin Mirdarsoltany ◽  
Alireza Rahai ◽  
Mohammad Zaman Kabir
Keyword(s):  
Carbon Fibers ◽  
High Strength ◽  
Initial State ◽  
Accelerated Corrosion ◽  
Construction Engineering ◽  
Steel Columns ◽  
Axial Strength ◽  
Frp Composites ◽  
Steel Column ◽  
Longitudinal Layer

The application of FRP composites in recent years has attracted much attention. Lightweight, high strength, and corrosion resistance are among the properties that make this material available in various forms in construction engineering. The present study analyzed the performance of carbon fiber-reinforced accelerated corrosion-proof box. Nine columns without corrosion and cross-corrosion reinforcement were tested in laboratory and software. Syntax reinforcement was applied locally to the damaged area with respect to a transverse and longitudinal layer. The results of the axial test showed that, due to corrosion, the damaged site was weakened by the loading and severe resistance decreased, and the range of damage points due to the axial load was highly deformed compared to the initial state. The damage caused on both sides of the steel column had a significant effect on reducing the hardness and deformation of the steel columns; it is worth noting that the corrosion on both sides of the steel column had the most variations among the samples. Application of CFRP with 2 layers in the damaged steel columns resulted in increased bearing capacity and hardness in the affected area due to corrosion so that reinforcement of these columns by carbon fibers improved the axial strength.

The Chemical Reactivity Comparison of High-Modulus and High-Strength Carbon Fibers

2020 ◽  
Vol 989 ◽  
pp. 347-352
Author(s):  
A.I. Gomzin ◽  
R.F. Gallyamova ◽  
N.G. Zaripov ◽  
S.N. Galyshev ◽  
F.F. Musin
Keyword(s):  
Carbon Fibers ◽  
Chemical Reactivity ◽  
High Strength ◽  
Mechanical Tests ◽  
High Modulus ◽  
Initial State ◽  
Alloy Matrix ◽  
Three Point Bending ◽  
Burn Out ◽  
High Strength Fiber

In this study two types of PAN-based continuous carbon fibers were compared: high-modulus UMT-430 and high-strength UMT-49. The dynamics of carbon fibers oxidation at a temperature of 600°C with an exposure from 1 to 6 hours was evaluated. It was found that high-strength fibers burn out faster than high-modulus. The surface of the fibers in the initial state and after annealing was investigated. Composite samples with an Al-6Mg alloy matrix, reinforced with these types of carbon fibers, were tested for three-point bending. It was found that the strength of the composite with high-modulus fiber was more than 2 times higher than strength of the composite with high-strength fiber. The samples fracture surfaces of Cf/Al composites after mechanical tests are investigated.

Promising hybrid fabrics based on carbon and aramid fibers as a reinforcing filler for polymer composites

2019 ◽  
pp. 86-95 ◽  
Author(s):  
G. F. Zhelezina ◽  
V. G. Bova ◽  
S. I. Voinov ◽  
A. Ch. Kan
Keyword(s):  
Composite Material ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Modulus ◽  
Hybrid Composite Material ◽  
Hybrid Fabric ◽  
Reinforcing Filler ◽  
Physical And Mechanical Characteristics

The paper considers possibilities of using a hybrid fabric made of high-modulus carbon yarn brand ZhGV and high-strength aramid yarns brand Rusar-NT for polymer composites reinforcement. The results of studies of the physical and mechanical characteristics of hybrid composite material and values of the implementation of the strength and elasticity carbon fibers and aramid module for composite material are presented. 

High strength micron size carbon fibers from polyacrylonitrile–carbon nanotube precursors

Carbon ◽  
2014 ◽  
Vol 77 ◽  
pp. 442-453 ◽  
Author(s):  
Korhan Şahin ◽  
Nicholas A. Fasanella ◽  
Ioannis Chasiotis ◽  
Kevin M. Lyons ◽  
Bradley A. Newcomb ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fibers ◽  
High Strength ◽  
Micron Size

IN-SITU MEASUREMENT OF PERMEABILITY BETWEEN CARBON FIBER/RESIN

2021 ◽  
Author(s):  
MASAKI ENDO ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Capital Investment ◽  
High Strength ◽  
Carbon Fiber Reinforced Plastic ◽  
Manufacturing Costs ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Carbon fiber reinforced plastic (CFRP) is a composite material in which carbon fibers are impregnated with resin to achieve both high strength and high rigidity. CFRP is an excellent material, but it is expensive in terms of materials, manufacturing costs, and capital investment, and it takes a lot of time to complete a product. In order to solve these problems, the demand for de-autoclaving has been increasing in recent years. If molding can be performed without autoclaving, it will be possible to reduce costs and improve productivity in terms of materials and capital investment costs.

Performance of parking steel column damaged by fire

2019 ◽  
Vol 10 (2) ◽  
pp. 138-154
Author(s):  
Farshid Masoumi ◽  
Ebrahim Farajpourbonab
Keyword(s):  
Cyclic Loading ◽  
Seismic Performance ◽  
Numerical Study ◽  
Mechanical Analysis ◽  
Content Type ◽  
Steel Columns ◽  
Fire Engineering ◽  
Steel Column ◽  
Concrete Coating ◽  
Fire Loading

Purpose The primary purpose of this research was to expand the knowledge base regarding the behavior of steel columns during exposure to fire. This paper presents the numerical study of the effect of heat on the performance of parking steel column in a seven-story steel building under cyclic loading. Design/methodology/approach In this research, the forces and deformations developed during a fire are estimated by using detailed 3D finite-element models. The analyses are in the form of a coupled thermo-mechanical analysis in two types of loading: concurrent loading (fire and cyclic loading) and non-concurrent loading (first fire and then cyclically), and the analyses have been conducted in both states of the fire loading with cooling and without cooling using the ABAQUS software. Further, it was investigated whether, during the fire loading, the specimen was protected by a 3-cm-thick concrete coating and how much it changes the seismic performance. After verification of the specimen with the experimental test results, the column model was investigated under different loading conditions. Findings The result of analyses indicates that the effect of thermal damage on the performance of steel columns, when cooling is happening late, is more than the state in which cooling occurs immediately after the fire. In this paper, thermal–seismic performance of parking steel columns has been specified and the effect of the fire damage has been investigated for the protected steel by concrete coating and to the non-protected steel, under both cooling and non-cooling states. Originality/value This study led to recommendations based on the findings and suggestions for additional work to support performance-based fire engineering. It is clear that predicting force and deformation on steel column during fire is complex and it is affected by many variables. Here in this paper, those variables are examined and proper results have been achieved.

scholarly journals STRUCTURAL BEHAVIORS OF CONCRETE FILLED SQUARE TUBULAR HIGH STRENGTH STEEL COLUMN TO H-BEAM CONNECTIONS

1993 ◽  
Vol 446 (0) ◽  
pp. 127-136 ◽  
Author(s):  
Koji MORITA ◽  
Masaru TERAOKA ◽  
Takahiko SUZUKI ◽  
Toshio FUJIWARA ◽  
Hisaaki YABUSAME
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Steel Column ◽  
H Beam ◽  
Structural Behaviors

scholarly journals Development of Self-Sensing Textile Strengthening System Based on High-Strength Carbon Fiber

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2062
Author(s):  
Marcin Górski ◽  
Rafał Krzywoń ◽  
Magdalena Borodeńko
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
High Efficiency ◽  
High Strength ◽  
Strain Gauges ◽  
Building Structures ◽  
Climatic Chamber ◽  
Daily Cycle ◽  
Temperature Changes ◽  
Temperature And Humidity

The monitoring of structures is one of the most difficult challenges of engineering in the 21st century. As a result of changes in conditions of use, as well as design errors, many building structures require strengthening. This article presents research on the development of an externally strengthening carbon-fiber textile with a self-sensing option, which is an idea is based on the pattern of resistive strain gauges, where thread is presented in the form of zig-zagging parallel lines. The first laboratory tests showed the system’s high efficiency in the measurement of strains, but also revealed its sensitivity to environmental conditions. This article also presents studies on the influence of temperature and humidity on the measurement, and to separate the two effects, resistance changes were tested on unloaded concrete and wooden samples. The models were then placed in a climatic chamber, and the daily cycle of temperature and humidity changes was simulated. The research results confirmed preliminary observations of resistivity growths along with temperature. This effect is more visible on concrete samples, presumably due to its greater amount of natural humidity. The strain measurement with carbon fibers is very sensitive to temperature changes, and applications of this method in practice require compensation.

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