Surepally, N
(2015)
Improved Confinement Model for Behavior of Reinforced Concrete Circular Bridge Columns under Flexure Dominant Mode.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
This study presents an improved analytical approach for the analysis of reinforced concrete (RC) circular columns by proposing a new confinement model. Three widely used confinement models (Sheikh and Uzumeri 1982, Saatcioglu and Razvi 1992 and Mander and Priestly 1988) are examined and improvements are suggested. It is well established that stress- strain behavior of confined concrete is completely different from that of plain concrete. The level of confinement depends on the (i) amount of transverse reinforcement, (ii) amount of longitudinal reinforcement and spacing of rebar and (iii) level of axial load. The influence of these parameters on the section and member level behaviors are analyzed and an improved model is proposed for analysis of RC circular columns under flexure. Predictions of the analytical models considered in this study were compared with the experimental data of two columns tested by the authors and others from PEER DATABASE. Experimental data of eight full scale columns tested under flexure- shear is used for the evaluation of existing and the proposed models over a range of parameters. Evaluation of test results indicates a very good agreement of the prediction of the proposed model with the test data.
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