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http://dx.doi.org/10.12989/acc.2021.11.3.193

Compressive behavior of steel stirrups-confined square Engineered Cementitious Composite (ECC) columns  

Zheng, Pan-deng (School of Civil Engineering, Huaqiao University)
Guo, Zi-xiong (School of Civil Engineering, Huaqiao University)
Hou, Wei (School of Civil Engineering, Huaqiao University)
Lin, Guan (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University)
Publication Information
Advances in concrete construction / v.11, no.3, 2021 , pp. 193-206 More about this Journal
Abstract
Extensive research has been conducted on the basic mechanical property and structural applications of engineered cementitious composites (ECC). Despite the high tensile ductility and high toughness of ECC, transverse steel reinforcement is still necessary to confine ECC for high performance. However, limited research has examined performance of ECC confined with practical amount of transverse reinforcement. This paper presents the results of axial compression tests on 14 square ECC columns and 4 conventional concrete columns (used as control specimens) with transverse reinforcement. The test variables were spacing, configuration (square ties or square and diamond shape ties), and yield strength of stirrups. The test showed that ECC columns confined with steel stirrup had good compressive ductility, and the stirrup spacing had the greatest effect on the compressive performance. The self-confinement effect of ECC results in a more uniform but slower expansion of the whole column compared with CC ones. The test results are then compared against the predictions from a number of existing models for conventional confined concrete. It is indicated that these models fail to predict the axial strains at peak axial stress and the trend of the stress-strain curve of steel stirrups-confined ECC with sufficient accuracy. Several new equations are then proposed for the compressive properties of steel-confined ECC based on test results and potential approaches for future studies are proposed.
Keywords
columns; compressive behavior; engineered cementitious composite (ECC); steel reinforcement; confinement; stress-strain model;
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