Seismic Behavior of Lightweight and Normal Weight Concrete Columns

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Title: Seismic Behavior of Lightweight and Normal Weight Concrete Columns

Author(s): B. G. Rabbat, J. I. Daniel, T. L. Weinmann, and N. W. Hanson

Publication: Journal Proceedings

Volume: 83

Issue: 1

Appears on pages(s): 69-79

Keywords: buildings; columns (supports); confined concrete; cyclic loads; deformation; ductility; earthquake resistant structures; flexural strength; frames; lightweight concretes; load tests (structural); strength; reinforced concrete; structural design.

Date: 1/1/1986

Abstract:
An experimental investigation was conducted to provide data on the behavior of lightweight and normal weight reinforced concrete columns subjected to simulated seismic forces. Sixteen full-scale column-beam assemblies representing a portion of a frame subjected to simulated seismic loading were tested. Test variables included concrete type, column size, amount of main column steel, size and spacing of column confining hoops, and magnitude of column axial load. The columns were subjected to constant axial load and slow moment reversals at increasing inelastic deformations. Test data showed that properly designed lightweight concrete columns maintained ductility and strength when subjected to large inelastic deformations from load reversals. Confinement requirements for normal weight concrete columns were shown to be applicable to lightweight concrete columns with axial loads up to 30 percent of the column design strength. Supplementary crossties engaging the column steel may be used to confine the core of lightweight and normal weight concrete columns.