Development of Force-Based Fiber Frame Finite Element for FRP Concrete Members with Multi-axial Behaviors

다축거동을 고려한 FRP 콘크리트 부재의 층상화 하중-기초 유한요소모델 개발

In the current study, a force-based fiber frame finite element model of FRP concrete structural members has been developed. For compressive behaviors of confined concrete wrapped by FRP jackets, the multiaxial behavior of concrete has been considered with the equivalent tangent modulus of concrete. The behavior of FRP jackets has been modeled using the mechanics of orthotropic laminated composite materials in two-dimensional stress states. The force-based finite element formulation is based on the force-interpolation functions within the element without using the displacement shape functions to satisfy the equilibrium in element levels.