The non-prestressed prototype pile bents (CPCP1, CPGP1, SCCP1 and SCGP1)

had a much lower stiffness than the steel reinforced prestressed pile which led to a very

low ductility factor. In all cases an improvement in ductility of the pile bents was

observed. The pile bents using cast in place solid prototypes behaved better than the pile

bents using spun cast hollow pile prototypes. Confinement, which is the source of

ductility for FRP reinforced prototypes, is more effective for solid section and less

effective for hollow sections and is the reason solid sections outperform hollow sections.

The prestressed prototype pile bents (CPPCP, CPPGP, SCPCP and SCPGP) had

improved stiffness and ductility compared to the non prestressed FRP reinforced pile

bents.

 120

 100

 8 80

 60



 20 -A-SCPCP2
 S--SCPCP3

 0 5 10 15 20 25
 Bent Displacement (in)

Figure 7-15. Pile bent load-displacement curves for CSPP, SCPCP2 and SCPGP3 piles

 The ductility factors for all the prototype pile bents analyzed are listed in Table 7-5.

The non-prestressed cast in place prototype FRP reinforced pile bents had a ductility

factor that was approximately 49% lower than the ductility factor of the steel prestressed

pile bent. The non-prestressed spun cast prototype pile bents had an even lower ductility

factor which was approximately 59% lower.