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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Compressive and Flexural Behavior of RC Columns Laterally Prestressed by High-strength Steel Bars
Author(s): T. Hitaka, K. Sakino, T. Yamakawa, and A. Furukawa
Publication: Special Publication
Appears on pages(s): 429-446
Keywords: confined concrete; high-strength steel bar; moment - curvature analysis; prestress confinement; retrofit; ultimate moment
Abstract:A dry column confining method using high-strength steel bars proposed by one of the authors is applied to a total of 24 reinforced concrete columns. Two series of tests were conducted on these columns. Hoop steel ratio of the columns was 0.1%, typical of RC columns designed before the Japanese Building Code in 1981. These RC columns were laterally reinforced using 19 sets of four high-strength steel bars and L-shaped steel blocks that were attached around the column by tightening the high-strength steel bars. Five specimens were exposed to concentric compression. Uniform bending test was conducted on 19 specimens under constant axial load. High-strength steel bars were pre-tensioned before testing. The amount of pre-tension was controlled by strain in the bars. It was found that the new confining method is effective to increase ductility of the RC columns. Strength of a RC column increases in a proportional manner to the amount of pre-stress in high-strength steel bars. Strength estimation method is proposed. The measured strength varied between 93% to 116% of the calculated strength.
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