Experimental Program

Pile Specimen Construction

 Table 5-1 contains details of all four pile specimens constructed. The specimen

variables included shape, type and size of reinforcement and use of CFRP grid.

Table 5-1. Specimen details for cast in place pile specimens
Specimen Shape/Size Flexural FRP bar No of CFRP
 reinforcement size grid layers
 (in.)
 1 Square/16 in. 8 GFRP bars 0.75 2
 2 Round/16 in. 8 GFRP bars 0.75 2
 3 Round/16 in. 12 CFRP bars 0.375 0
 4 Round/16 in. 12 CFRP bars 0.375 2

 The total length for both specimens 1 and 2 was 20 ft (see Fig. 5-1). Specimen 1

had a square shape but a tubular reinforcement arrangement (see Fig. 5-2(a)) because it

was easier to form the grid in that shape. Specimen 2 had a tubular shape and a similar

reinforcement arrangement as specimen 1 (see Fig. 5-2(b)). The longitudinal

reinforcement for both piles was eight 0.75-in. diameter GFRP reinforcing bars.

 Centerline




 1 Grid Layer 2 Grid Layers 1 Grid Layer
 7' 6' 7'

 20'


Figure 5-1. Longitudinal view of specimen 2

 Specimens 3 and 4 also had a length of 20 ft. Both specimens had identical

reinforcing bar arrangements. Twelve 0.375-in. diameter CFRP reinforcing bars were

used as longitudinal reinforcement in specimens 3 and 4 (see Fig 5-3). Most CFRP bars

were placed in bundles of two (see Fig. 5-3) at the bottom of the piles to force a