층상화 단면모델을 이용한 철근콘크리트 기둥의 비선형 유한요소 해석
Nonlinear finite element analysis of reinforced concrete column using fiber section model approach
토목공학과 구조 및 토질전공
토목공학 구조분석 설계;
- 원문 URL
Concrete has been widely used as structural material and its physical behavior has been investigated by number of researchers. Especially those efforts have poured in the more accurate prediction the response of concrete structures under static and dynamic loads. Sophisticated constitutive modeling of the concrete is very complicate due to its material nonlinearity defined by the loading state. Moreover, such models have difficulties for the application to the general concrete structures. Therefore, simpler model is required to apply into the general concrete structures. In this research, nonlinear Timoshenko beam element that is able to capture nonlinear shear deformation is developed. The cross-section is modeled as fiber approach. The developed element is implemented into the finite element program to analysis general reinforced concrete structures. As parametric study, several reinforced concrete columns are analyzed and compared with experimental results. Since the model is based on the fiber approach for section discretization, the plastic progress of the section can be traced and the coupling effect of the axial and flexural response. The proposed model shows more reasonable prediction than traditional beam theory in short columns or strong shear column due to the consideration of shear deformation. The shear-locking problems are avoided using reduced integration.