| Title |
Simplified Model for the Stress-Strain Relationship of Confined Concrete |
| Authors |
Kim, Won-Woo ; Mun, Ju-Hyun ; Yang, Keun-Hyeok |
| DOI |
http://dx.doi.org/10.5659/JAIK_SC.2015.31.4.79 |
| Keywords |
Confined concrete ; Stress-strain relationship ; Lateral reinforcement ; Confinement effect |
| Abstract |
This study aims to develop a simple and rational stress-strain model of confined concrete in compression. Considering the confinement effect provided by the lateral reinforcement, the specified properties of confined concrete was formulated using regression analysis of 123 data sets as follows: modulus of elasticity, strength gain factor, strains at peak stress and 85% of the peak stress on the descending branch. Numerical and parametric analysis were carried out to derive equations for the key parameter determining the slopes of the ascending and descending branches of the stress-strain curves of confined concrete. The reliability of the developed model is examined using a normalized root mean-square error obtained from a comparison of model estimates with the experimental data. The proposed model gives superior accuracy and mathematical simplicity. |