its own weight (see Fig. 6-28(b)). In addition, crushing in the compression zone occurred

outside the constant moment region where shear stresses were also present. Inspection of

the failure mode of SCG1 indicates that the failure initiated with crushing in the

compression zone followed by diagonal cracking as a result of the loss of cross-section

due to crushing. To ensure that the failure mode was purely flexural compression, shear

reinforcement outside the constant moment region was added to subsequent specimens.

 15

 12




 3 6
 '-9 ____



 3 ~-0- SCC1
 -B- SCG1
 0 4 1
 0 3 6 9 12 15 18
 Displacement (in)

Figure 6-27. Load-displacement curves for piles SCC1 and SCG1














(a) (b)

Figure 6-28. Pile specimens after testing: (a) SCC1 and (b) SCG1

 The failure of pile SCC2 took place inside the constant moment region and the pile

exploded into pieces (see Fig. 6-29(a)). However, the pieces for specimen SCC2 were

larger than the concrete pieces of specimen SCC1.