Abstract
Paste fiber cloth reinforcement method is an important method in the current reinforcement project, and carbon fiber reinforced plastics (CFRP) and glass fiber reinforced plastics (GFRP) are the two most commonly used materials in the reinforcement method. CFRP have high tensile strength, high elastic modulus, and low elongation, while GFRP have lower tensile strength and elastic modulus, but high elongation. Studies have shown that the combination of two fiber materials can effectively improve the weakness of a single fiber material, make better use of the advantages of these two materials, and improve the comprehensive mechanical properties of the fiber material. Columns, as the main load-bearing components in the concrete structure system, have a significant impact on the stability of the building structure. By studying the influence of the combined fiber cloth on the compressive performance of the column, the optimal fiber cloth combination scheme was found out, which provides a reference for practical engineering applications.
Highlights
Since 1997, China began to introduce fiber plastics to strengthen concrete structure technology from abroad
Su Zhi et al carried out an axial compression test on a steel double-pipe long column made of glass fiber reinforced plastics (GFRP) reinforced recycled concrete, taking the loading method and the slenderness ratio as variables, analyzed the effects of these two variables on the axial compression bearing capacity and ductility of the test column, and the correlation curve was drawn [3]
Based on the seismic performance test results of reinforced corroded concrete columns reinforced with hybrid FRP, Deng Zongcai et al established the restoring force model and skeleton curve of the test piece, which are in good agreement with the actual test results [4]
Summary
Since 1997, China began to introduce fiber plastics to strengthen concrete structure technology from abroad. Su Zhi et al carried out an axial compression test on a steel double-pipe long column made of GFRP reinforced recycled concrete, taking the loading method and the slenderness ratio as variables, analyzed the effects of these two variables on the axial compression bearing capacity and ductility of the test column, and the correlation curve was drawn [3]. Relevant experts and scholars carry out experimental and theoretical research on reinforced concrete structures strengthened with fiber cloth of various materials. The efficiency of a single fiber reinforcement is low; when the interlayer hybrid fiber cloth is used for reinforcement, the strain of the hybrid fiber cloth is increased by 3 to 5 times, which significantly improves the ductility and bearing capacity of the test column, and the construction cost is lower [6 ]. A two-step numerical simulation method for FRP cloth confined concrete is established and a simplified bilinear model is proposed [7]
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