180
150
120
S 90
i 60
-- Displacement
30 -B- Differential
STheoretical
0.0000 0.0010 0.0020 0.0030
Curvature (rads/in)
Figure 5-20. Moment-curvature curves for specimen 1
180
150
120
90
30 -A-Differential
30 1i -e- Theoretical
0.0000 0.0020 0.0040 0.0060 0.0080 0.0100 0.0120
Curvature (rads/in)
Figure 5-21. Moment-curvature curves for specimen 2
The theoretical M-D curve for specimen 2 agreed well with the displacement curve.
The slope of the theoretical curve was approximately 25% higher compared to the slope
of the displacement curve. The differential curve did not agree well with the displacement
curve. The differential curve had a slope approximately 68% lower than the slope of the
displacement curve.
The experimental and theoretical M-D curves of specimens 3 and 4 (see Figs 5-22
and 5-23) were also calculated and plotted in the same manner as for specimens 1 and 2.