Abstract
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.
Highlights
Today, due to the expansion and importance of oil and maritime transport activities and attention to mining in the seabed, construction activities such as the construction of piers, platforms, and similar structures in coastal and oceanic areas have increased significantly
Increasing the longitudinal dimensions of the defect showed that due to the compressive load, the resistance would decrease and the lateral deformations increase. e effect of corrosion on the two sides was much greater than the other samples and the deformation in this sample occurred significantly
A horizontal defect created on one side of the center of the box steel column reduced the bearing capacity to 128 kN
Summary
Due to the expansion and importance of oil and maritime transport activities and attention to mining in the seabed, construction activities such as the construction of piers, platforms, and similar structures in coastal and oceanic areas have increased significantly. When designing concrete and metal structures that are located in the vicinity of seawater, it is necessary to consider the effect of destructive environmental factors to which concrete is exposed during the long years of operation and it seems that the designs based on the criterion of strength for such structures are not enough. High-rise buildings are constructed with steel and concrete structures, and each of the concrete and steel structural systems has its advantages and disadvantages, which cannot be expressed in this article, and employers, according to their needs, one of the two. What is less considered when choosing the structural system of buildings is their ability to resist accelerated corrosion. Steel structures, with advantages of high strength and good ductility, have disadvantages that have limited their use in some structures. Accelerated corrosion is one of the deadliest hazards that structures may face during their lifetime [2]
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