Title:
Influence of Axial Force Variations on Flexural Behavior of Reinforced Concrete Columns
Author(s):
Daniel P. Abrams
Publication:
Structural Journal
Volume:
84
Issue:
3
Appears on pages(s):
246-254
Keywords:
axial loads; bending moments; columns (supports); deflection; ductility; earthquakes; flexural strength; frames; reinforced concrete; stiffness; strains; structural analysis; structural design; Structural Research
DOI:
10.14359/2691
Date:
5/1/1987
Abstract:
Tests of 10 reinforced concrete column specimens subjected to reversals of lateral deflection and axial force have shown that variations in axial compression can influence strength, stiffness, and deformation capacity of reinforced concrete columns. Measured relations between moment and rotation or strain were asymmetrical even though cross sections were symmetrical about the axis of bending and deflections were equal for each direction of sway. The shape of the hysteretic loop was influenced by the range of axial-force variation and the rate of change of axial force with lateral deflection. Flexural strengths were not dependent on the sequence of axial force at ultimate. Implications for design of symmetrical reinforced concrete frames are discussed in terms of measured behavior of test columns.