The ductility factors are listed in Table 7-2. The ductility factors for the steel

reinforced pile bents were calculated based on the procedure described in chapter 2. The

ductility factors for the FRP reinforced pile bents were calculated using the same

procedure and the definition of splalling displacement as defined in chapter 4. The

prestressed pile bent with piles with minor corrosion had a ductility factor of three. The

prestressed pile bent with the moderately corroded piles had a ductility factor of two and

a capacity that was 68% of the capacity of the pile bent with minor corrosion. The last

prestressed pile bent with the severely corroded piles had the highest ductility factor from

all pile bents analyzed but its load capacity was also severely reduced to approximately

41% of the capacity of the pile bent with minor corrosion.

Table 7-2. Ductility factors for pile bents (load case 1)
Pile type Pideal 6y or 6c (in) 6, (in) LA
 (kips)
 Prestressed concrete (minor corrosion) 76.4 3.3 9.9 3.0
 Prestressed concrete (moderate corrosion) 51.9 2.8 5.7 2.0
 Prestressed concrete (severe corrosion) 31.4 2.6 11.7 4.5
 Cast in place GFRP bar / CFRP grid (CPGS) 45.7 8.9 15 1.7
 Cast in place GFRP bar / CFRP grid (CPGR) 40.3 14.1 19.5 1.4
 Cast in place CFRP bar and grid (CPCC) 44.7 10.4 13.6 1.3
 Cast in place CFRP bar and grid (CPCG) 61.3 14.6 20.8 1.4
 Spun cast CFRP bar and grid (SCC) 30.8 17.7 20.5 1.2
 Spun cast CFRP bar and grid (SCG) 34.4 19.5 21.6 1.1

 None of the pile bents using the FRP reinforced piles had a comparable ductility

factor as the pile bent with minor corrosion damage. The highest ductility factor for the

pile bents using FRP reinforced piles was approximately 1.7 which was 57% of the

ductility factor needed to compare favorably to the pile bent with minor corrosion. The

ductility factor of the pile bent using the cast in place square piles reinforced with GFRP

bars and CFRP grid was approximately 85% of the ductility factor of the pile bent with

the moderately corroded piles. The capacity of the pile bents using the FRP reinforced