A Practical Finite Element Modeling Strategy to Capture Cracking and Crushing Behavior of Reinforced Concrete Structures

Abstract

Nonlinear finite element (FE) analysis of reinforced concrete (RC) structures is characterized by numerous modeling options and input parameters. To accurately model the nonlinear RC behavior involving concrete cracking in tension and crushing in compression, practitioners make different choices regarding the critical modeling issues, e.g., defining the concrete constitutive relations, assigning the bond between the concrete and the steel reinforcement, and solving problems related to convergence difficulties and mesh sensitivities. Thus, it is imperative to review the common modeling choices critically and develop a robust modeling strategy with consistency, reliability, and comparability. This paper proposes a modeling strategy and practical recommendations for the nonlinear FE analysis of RC structures based on parametric studies of critical modeling choices. The proposed modeling strategy aims at providing reliable predictions of flexural responses of RC members with a focus on concrete cracking behavior and crushing failure, which serve as the foundation for more complex modeling cases, e.g., RC beams bonded with fiber reinforced polymer (FRP) laminates. Additionally, herein, the implementation procedure for the proposed modeling strategy is comprehensively described with a focus on the critical modeling issues for RC structures. The proposed strategy is demonstrated through FE analyses of RC beams tested in four-point bending—one RC beam as reference and one beam externally bonded with a carbon-FRP (CFRP) laminate in its soffit. The simulated results agree well with experimental measurements regarding load-deformation relationship, cracking, flexural failure due to concrete crushing, and CFRP debonding initiated by intermediate cracks. The modeling strategy and recommendations presented herein are applicable to the nonlinear FE analysis of RC structures in general.

Application of Equivalent Simplified Calculation Model of Isolated Structure in Super High-rise Building

“…The deformation is mainly concentrated in the isolation layer, the superstructure basically maintains the translational state, and the interlayer deformation of the structure is basically unchanged. It shows that the isolation mechanism of isolation structures with different height width ratio is the same, and the deformation is mainly concentrated in the isolation layer [10][11][12]. In addition, with the increase of aspect ratio, the mass of superstructure increases, the area of isolation support and the diameter of lead core increase, and the horizontal stiffness of isolation layer and the yield stress of lead core also increase.…”

Crack Resistance of Lightly Reinforced Concrete Structures

“…The currently predominant opinion (e.g., in Refs. [18][19][20][21][22][23][24]) is that the best explanation for the fracture behavior of concrete can be formulated by the principles of fracture mechanics. Therefore, a numerical analysis based on non-linear fracture mechanics was performed in order to provide better insight into the phenomena associated with the tensile fracture of concrete in flexural members.…”

Shear Strength Analysis of Reinforced Concrete Without Transverse Reinforcement using Finite Element Method

“…Study using this method can be done with lower cost compared to physical testing at the laboratory. [2] There haven't been many research done to study about high strength concrete using the finite element method. Based on that reason the research about the effect of longitudinal reinforcement on the shear strength of concrete using the finite element method was done.…”