부착슬립과 인장보강효과에 의한 철근콘크리트 구조물의 비선형 거동

Abstract

This paper concentrates on the development of numerical models which can consider effectively the material nonlinearities, such as concrete cracking and bond-slip apppeared in proportion to an increase of applied load. To describe a cracking of which direction has been changed the rotating crack model is adopted. A cracking criterion derived from fracture mechanics principles is used to remove the numerical instability which is dependent upon the used finite element mesh size. Moreover, a new reinforcing steel model including the bond-slip effect without taking the double nodes at one point is proposed basee on the force equilibrium and matrix condensation technique in order to simulate the structural behavior of bond-slip which is important in the structures, i.e., shear walls and beam-to-column joints, etc. Finally, correlation studies between analytical and experimental results and parameter studies are conducted with the objective to establish the varidity of the proposed models and identify the significance of various effects on the local and global response of reinforced concretd sturctures.