The significant difference in the
tip deflection at failure between the conventional prestressed
concrete pole and the FRP-reinforced concrete
poles is due to the higher modulus of elasticity of the steel
strands, namely 18,000 ksi (124,000 MPa) and 5920 ksi
(40,000 MPa) for CFRP and GFRP, respectively, compared with 28,000 ksi (193,000 MPa) for steel prestressing
strand.