NUMERICAL SIMULATION OF CONFINED CONCRETE COLUMNS AND A PARAMETRIC STUDY

The curiosity to understand the behavior of confined concrete columns has led researchers to carry out extensive experimental work over the years. Numerous empirical confinement models have been reported in the literature for the prediction of stress-strain response of the columns behavior under concentric loading, though, nothing significant has been said about the numerical modeling of the problems wherein the nonlinear response of confined concrete columns may be reasonably predicted. In the present study, material models for both concrete and steel have been formulated and nonlinear finite element analysis of threedimensional confined concrete models has been carried out. The analysis included the provisions for cover spalling. A couple of examples have been presented for the validation of the numerical methodology proposed in this work. A parametric study has also been carried out to find out the effect of different parameters like concrete strength, reinforcement configuration, spacing of lateral ties and type of cross-section on the response of the confined concrete columns. The parametric study revealed some very important observations regarding the behavior of confined concrete columns.

[1]  A. Mirmiran,et al.  Nonlinear finite element modeling of concrete confined by fiber composites , 2000 .

[2]  Patrick Paultre,et al.  Stress-Strain Model for Confined High-Strength Concrete , 1995 .

[3]  Stephen J. Foster,et al.  Cover Spalling in HSC Columns Loaded in Concentric Compression , 1998 .

[4]  Wai-Fah Chen,et al.  Constitutive equations for engineering materials , 1994 .

[5]  S. T. Mau,et al.  Recalibration of a plastic-fracturing model for concrete confinement , 1989 .

[6]  Shamim A. Sheikh,et al.  STRENGTH AND DUCTILITY OF TIED CONCRETE COLUMNS , 1980 .

[7]  Mohamed A. H. Abdel-Halim,et al.  ANALYTICAL STUDY FOR CONCRETE CONFINEMENT IN TIED COLUMNS , 1989 .

[8]  James G. MacGregor,et al.  NUMERICAL INVESTIGATION OF ECCENTRICALLY LOADED HIGH-STRENGTH CONCRETE TIED COLUMNS , 1996 .

[9]  Frederic Legeron,et al.  Uniaxial Confinement Model for Normal- and High-Strength Concrete Columns , 2003 .

[10]  M. Saatcioglu,et al.  Confinement Model for High-Strength Concrete , 1999 .

[11]  Pradeep Bhargava,et al.  Comparative study of confinement models for high-strength concrete columns , 2005 .

[12]  Wai-Fah Chen,et al.  Finite Element Study of Confined Concrete , 2006, SP-238: International Symposium on Confined Concrete.

[13]  Patrick Paultre,et al.  High‐Strength Concrete Columns Confined by Rectangular Ties , 1994 .

[14]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

[15]  Wai-Fah Chen.  Plasticity in reinforced concrete , 1982 .