Title: The Structural Effectiveness of Protective Shells on Reinforced Concrete Columns

Author(s): F. E. Richart

Publication: Journal Proceedings

Volume: 43

Issue: 11

Appears on pages(s): 353-364

Keywords: none

DOI: 10.14359/8752

Date: 11/1/1946

Abstract:
Presents a study of 108 plain, tied, or spirally re- inforced concrete columns. The columns were 7, 8, and 9 in. round or square, 45 in. long, and the ties and spirals were 6 in. in diameter. The columns were loaded axially, with "flat" ends. Strains were measured and close observations were made of the initial failure of the protective shell. Analyses of the test results were made to see if case with the shells of spirally reinforced columns, but the tied columns showed a slight deficiency in the strength expected on the basis of previous tests of the 193- ACI columns investigation. The test results lend support to the design methods prescribed in the current ACI building regulations for reinforced concrete.