[A Study of Bursting Reinforcement In Precast Rc Columns With Use Of Finite Element Abaqus]

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Bursting Reinforcement In Precast Rc Columns

Literature Review

A brief review of previous studies on the application of the finite element method to the analysis of reinforced concrete structures is presented is this section. A more detailed description of the underlying theory and the application of the finite element method to the analysis of linear and nonlinear reinforced concrete structures is presented in excellent stateof- the-art reports by the American Society of Civil Engineers in 1982 (ASCE 1982) and 1985 (Meyer and Okamura, eds. 1985). The earliest publication on the application of the finite element method to the analysis of RC structures was presented by Ngo and Scordelis (1967). In their study, simple beams were analyzed with a model in which concrete and reinforcing steel were represented by constant strain triangular elements, and a special bond link element was used to connect the steel to the concrete and describe the bond-slip effect. A linear elastic analysis was performed on beams with predefined crack patterns to determine principal stresses in concrete, stresses in steel reinforcement and bond stresses. Since the publication of this pioneering work, the analysis of reinforced concrete structures has enjoyed a growing interest and many publications have appeared. Scordelis et al. (1974) used the same approach to study the effect of shear in beams with diagonal tension cracks and accounted for the effect of stirrups, dowel shear, aggregate interlock and horizontal splitting along the reinforcing bars near the support. Nilson (1972) introduced nonlinear material properties for concrete and steel and a nonlinear bond-slip relationship into the analysis and used an incremental load method of nonlinear analysis. Four constant strain triangular elements were combined to form a quadrilateral element by condensing out the central node. Cracking was accounted for by stopping the solution when an element reached the tensile strength, and reloading incrementally after redefining a new cracked structure. The method was applied to concentric and eccentric reinforced concrete tensile members which were subjected to loads applied at the end of the reinforcing bars and the results were compared with experimental data.

Franklin (1970) advanced the capabilities of the analytical method by developing a nonlinear analysis which automatically accounted for cracking within finite elements and the redistribution of stresses in the structure. This made it possible to trace the response of twodimensional systems from initial loading to failure in one continuous analysis. Incremental loading with iterations within each increment was used to account for cracking in the finite elements and for the nonlinear material behavior. Franklin used special frame-type elements, quadrilateral plane stress elements, axial bar members, two-dimensional bond links and tie links to study reinforced concrete frames and RC frames coupled with shear walls. Plane stress elements were used by numerous investigators to study the behavior of reinforced concrete frame and wall systems. Nayak and Zienkiewicz (1972) conducted twodimensional stress studies which include the tensile cracking and the elasto-plastic behavior of concrete in compression using an initial ...