Abstract:

By fully considering the influence of load angle on the curvature ductility of reinforced concrete （RC） columns with L-shaped cross sections, two kinds of curvature ductilities are defined. Then, the curvature ductilities of 10800 L-shaped columns are calculated by simulation, and the influences of different parameters on the curvature ductility are revealed. The results indicate that   both the neutral axis angle and the axial compression ratio have great effect on the curvature ductility;   the increase of volumetric percentage of stirrups generally improves the curvature ductility;   at a constant axial compression ratio, concrete strength and longitudinal steel strength only have slight influence on the curvature ductility; and   the curve of curvature ductility tends to be smooth when the L-shaped ratio decreases. The formulas to calculate the curvature ductilities of neutral axis angle and load angle are also presented in the paper.

Key words: L-shaped cross section, reinforced concrete column, neutral axis angle, load angle, curvature ductility