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Effect of Confinement on the Behavior of High-Strength Lightweight Concrete Columns

• ID:

  1307

• ESCSI:

  4620.018

• Author:

  Basset, R.; Uzumeri, S.M.

• Publication Name:

  Canada Journal of Civil Engineering

• Type of Publication:

  Journal

• Publisher:

  University of Toronto

• Dated:

  1986

• Issue/Volume:

  December, Vol. 13, No. 6

• Other ID:

• Page(s):

  741-751

• Reference List:

  Y

• Abstract:

  This paper summarizes an experimental investigation into the behavior of high strength sand – lightweight concrete columns confined with rectangular ties. Fifteen reinforced and three unreinforced specimens were tested under monotonically increasing axial compression. Variables considered in this study were the longitudinal steel distribution and tie configuration, the tie steel spacing, the amount of tie steel, and the amount of longitudinal steel. The results indicated that unconfined high-strength lightweight aggregate concrete is a brittle material. The addition of lateral confining steel significantly improved the behavior of this material, with a large amount of lateral steel resulting in very ductile behavior. The tie configuration and resulting distribution of longitudinal steel contributed significantly to the confinement of concrete, with well-distributed steel resulting in improved behavior. The ratio of specimen to cylinder concrete strength was observed to be 0.98, which is much higher than the commonly assumed value of 0.85. The test results were compared with results from selected theoretical confinement models.