Composite Columns Under Sustained Load

by Russell Q. Bridge, (M.ASCE), Sr. Lect.; School of Civ. Engrg., Univ. of Sydney, Sydney, Australia,

Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 3, Pg. 563-576

Document Type: Journal Paper


The results are presented of an investigation into the influence of creep and shrinkage on the sustained load behavior of pin-ended composite columns. Tests were performed on built-up composite columns containing two steel channels without battens and encased in unreinforced concrete. The loads were sustained for periods up to 4 yr. Basic creep and shrinkage tests, the results of which are reported, were carried out to provide data for the proposed analysis. The observed deformations with time were compared with theoretical predictions from an iterative inelastic analysis based on the rate of creep method. With confirmation of the analytical predictions, the analysis was extended to produce complete load-deformation-time relationships for the test columns. The results show that the sustained load capacity of composite columns is reduced with time under load, the most severe case being the pin-ended column bent in single curvature and loaded at the same time drying, and thus shrinkage, commences.

Subject Headings: Composite columns | Load bearing capacity | Creep | Shrinkage (material) | Steel columns | Composite materials | Load factors | Deformation (mechanics)

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