method was always higher than the curvature based on the displacement profile
equations. This was a typical trend that was observed for all specimens.
140
S100
80
60
60 -
40 Disp. (SCG3)
20 -Diff. (SCG3)
0 0.0005 0.001 0.0015 0.002 0.0025
Curvature (rads/in)
Figure 6-45. Experimental M-PD curves for piles SCG3
Ductility Factors
The ductility was defined as the ratio between the ultimate displacement or
curvature and the displacement or curvature at first concrete crushing spellingg). More
details about this definition can be found in chapter 4. The process of calculating the
ductility factors for specimen SCC3 is illustrated in Figs. 6-46 (displacement ductility
factor) and 6-47 (curvature ductility factor). Pi is the load at which the concrete strain is
equal to 0.003 (nominal load) and Pu is the peak load. The same process was followed
for specimens SCC1, SCG1, SCC2 and SCG3. It should be noted that the experimental
curvature ductility factors were calculated based on the displacement moment-curvature
diagrams. The displacement and curvature ductility factors for the five specimens are
presented in Tables 6-5 and 6-6 respectively.
The displacement ductility factor of specimen SCG1 was 15% higher than the
ductility factor of specimen SCC1. The displacement ductility factor of specimen SCG3
was 12% higher than the ductility factor of specimen SCC3. Therefore an improvement