Studying The Seismic Behavior of FRP (Fiber Reinforced Plastic) Pipe in ‎Hybrid Reinforced Concrete Column Using the Finite Element Method

Abstract

Nowadays, reinforcement is an inevitable and rational thing to ensure the safety of structures. The use of FRP is one of the methods of reinforcing reinforced concrete buildings against lateral loads (earthquake). Columns, as the most important part of the structure, are of great importance in providing the strength, stability and ductility of the structure. Increasing the ductility and compressive strength of reinforced concrete columns is one of the notable effects of confining concrete, which is mostly done in three ways: using a steel jacket, a concrete jacket, and polymer fibers (FRP). Hybrid columns are used to increase confinement, increase flexibility, increase shear strength in the column, and consequently increase the efficiency of the member. Therefore, strengthening reinforced concrete columns with FRP has been used in many cases to increase the confinement of concrete and also to increase the ductility of the structure. Due to the importance of the degree of flexibility and energy absorption capacity in structures, especially under the influence of lateral loads, methods should be sought that increase the ductility of concrete structures. By controlling the lateral expansion of concrete by enclosing it, the strength and flexibility of concrete can be significantly increased. The use of FRP fibers for reinforcing concrete columns is an effective method for strengthening damaged concrete columns, as it enhances both load-carrying capacity and energy dissipation. The numerical results showed that the GFRP-confined model exhibited approximately 15% higher energy dissipation compared to the steel-confined model, demonstrating its superior ability to absorb seismic energy and reduce structural damage.

 This study aims to numerically investigate the seismic response of hybrid RC columns confined with FRP tubes under different ground motions using FEM in ABAQUS