Second Progress Report On Column Tests At The University Of Illinois

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Title: Second Progress Report On Column Tests At The University Of Illinois

Author(s): F. E. Richart and G. C. Staehle

Publication: Journal Proceedings

Volume: 27

Issue: 3

Appears on pages(s): 761-790

Keywords: none

Date: 3/1/1931

Abstract:
This re tests of 53 columns used to study the effect of sus- 1 ort of Series 3 of the investigation covers maintained loading for a year or more. The sustained load was applied by coiled car springs. Strain measurements were taken on both loaded and unloaded columns to separate the effects of shrinkage and creep. The greatest steel stress reported, after 5 months’ loading, was 27, 100 psi, an increase of I I,600 psi over the stress at initial loading. The increase in stress due to creep was greatest for the columns with the least longitudinal reinforcement.