A hybrid finite element-scaled boundary finite element method for reinforced concrete modelling
- Authors: Ooi, Ean Tat , Yang, Zhenjun
- Date: 2010
- Type: Text , Conference paper
- Relation: 10th International Conference on Computational Structures Technology, CST 2010; Valencia; Spain; 14th-17th September, 2010 published in Civil-Comp Proceedings Vol. 93
- Full Text: false
- Reviewed:
- Description: This paper develops a reinforced concrete model that is based on the novel hybrid finite element-scaled boundary finite element method for fully automatic multiple cohesive crack propagation in reinforced concrete beams. The hybrid method can efficiently extract accurate stress intensity factors from semi-analytical solutions of stresses or displacements and is also flexible in remeshing multiple cracks. The RC model lumps adjacent reinforcements into a layer of four-noded quadrilateral elements that is connected to the concrete bulk with cohesive interface elements. These elements model the concrete-steel interaction and consider both bond-slip and splitting tensile crack mechanisms. A reinforced concrete beam is modelled. The numerical results show good agreement with both experimental and numerical results available in literature. © Civil-Comp Press, 2010.
- Description: Civil-Comp Proceedings
Efficient prediction of deterministic size effects using the scaled boundary finite element method
- Authors: Ooi, Ean Tat , Yang, Zhenjun
- Date: 2010
- Type: Text , Journal article
- Relation: Engineering Fracture Mechanics Vol. 77, no. 6 (2010), p. 985-1000
- Full Text: false
- Reviewed:
- Description: This paper develops an efficient numerical approach to predict deterministic size effects in structures made of quasi-brittle materials using the scaled boundary finite element method (SBFEM). Depending on the structure's size, two different SBFEM-based crack propagation modelling methodologies are used for fracture analyses. When the length of the fracture process zone (FPZ) in a structure is of the order of its characteristic dimension, nonlinear fracture analyses are carried out using the finite element-SBFEM coupled method. In large-sized structures, a linear elastic fracture mechanics (LEFM)-based SBFEM is used to reduce computing time due to small crack propagation length required to represent the FPZ in an equivalent nonlinear analysis. Remeshing is used in both methods to model crack propagation with crack paths unknown a priori. The resulting peak loads are used to establish the size effect laws. Three concrete structures were modelled to validate the approach. The predicted size effect is in good agreement with experimental data. The developed approach was found more efficient than the finite element method, at least in modelling LEFM problems and is thus an attractive tool for predicting size effect. © 2010 Elsevier Ltd.