High-Workability Concrete Columns Under Concentric Compression

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Title: High-Workability Concrete Columns Under Concentric Compression

Author(s): Chien-Hung Lin, Shih-Ping Lin, and Chih-Han Tseng

Publication: Structural Journal

Volume: 101

Issue: 1

Appears on pages(s): 85-93

Keywords: column; confined concrete; ductility; load; workability

Date: 1/1/2004

Abstract:
A total of 30 column specimens were made and tested in this study to investigate the behavior of high-workability concrete (HWC) columns under concentric compression. Fifteen of the columns were made with HWC and the rest were made with normal concrete. The test variables included the concrete strength, amount of longitudinal reinforcement, volumetric ratio of transverse reinforcement, strength of transverse reinforcement, and the arrangement of transverse reinforcement. Comparisons were made between HWC columns and normal concrete columns. The results show that HWC columns have higher stiffness than normal concrete columns. The ductility and crack control ability of HWC columns are better than those of normal concrete columns. A decrease of concrete strength, increase of longitudinal reinforcement, increase of transverse reinforcement strength, and decrease of transverse reinforcement spacing improve the ductility of confined concrete and columns effectively. In addition, high-strength transverse reinforcement can be used to reduce the amount of confining reinforcement required based on the same ductility demand basis and can further alleviate the steel congestion and improve the concrete quality in the members.