Incremental Loading of Reinforced Lightweight Concrete Columns


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Title: Incremental Loading of Reinforced Lightweight Concrete Columns

Author(s): Donal W. Pfeifer and Eivind Hognestad

Publication: Special Publication

Volume: 29


Appears on pages(s): 35-46

Keywords: age; columns (supports); compressive strength; creep properties; drying shrinkage; expanded shale aggregatees; high-rise buildings; lightweight aggregate concretes; loading rate; loads (forces); modulus of elasticity; plain concrete; reinforced concrete

Date: 1/1/1971

Tests were made at the Portland Cement Association Laboratories regarding the elastic and time-dependedt shortening of reinforced lightweight concrete columns which were fabricated and loaded to simulate construction conditions encountered in a 50-story concrete building 714 ft (218 m) tall. The measured data from these incrementally loaded columns show low creep when the load is applied at a realistic rate. A 3-year field investigation of the actual structure will be undertaken and comparision between laboratory and field data will be made. Such comparisions wil provide data toward developing improved design concepts for ultra-high-rise concrete buildings.