This paper describes the implementation of a 3-dimensional concrete constitutive model for fiber-based analysis of reinforced concrete members subjected to combined loadings including torsion. The proposed model is formulated to address the interaction between the axial force, biaxial shear, biaxial bending, and torsion.
The shear mechanism along the beam is modeled by using the Timoshenko beam approach with three dimensional (3-D) frame elements with arbitrary cross-section geometry. The model considers the 3D equilibrium, compatibility, and constitutive laws of materials at the section and structural level. The concrete constitutive law follows the Softened Membrane Model (SMM) with a tangent-stiffness formulation. The emphasis of the paper is on evaluation of the effect of the different stress states on the global and local behavior of the member. The ability of the model to assess the ultimate strength, stiffness, energy dissipation, failure modes under 3-dimensional loading is evaluated by correlation of analytical results with experimental tests of RC specimens.
- Geosyntec Authors: Ravi Mullapudi
- All Authors: Ashraf Ayoub, Ravi Mullapudi
- Title: Analysis of Reinforced Concrete Columns Subjected to Combined Axial, Flexure, Shear and Torsional Loads
- Event or Publication: Journal of Structural Engineering, ASCE
- Practice Areas: Structural Assessment
- Date: 2013