Design, Construction, and Monitoring of US Longest Highway Bridge Span Prestressed with CFRP Strands

Data Availability Statement

Notation

A_fe

a discrete area equivalent to the area of CFRP strands positioned at the level of extreme CFRP layer (mm² or in.²);

A_fe(i)

equivalent area for the area of CFRP reinforcement at ith layer;

a

β₁c; depth of the equivalent stress block (mm or in.);

a_f

area of single CFRP strand in the ith layer (mm² or in.²);

b

width of compression face of the member; for a flanged section in compression, the effective width of the flange as specified in Article 4.6.2.6 of AASHTO LRFD 8th Edition (mm or in.);

b_w

width of web (mm or in.);

b_f1

width of the first, farther from neutral axis, compression flange of the member (mm or in.);

b_f2

width of the second compression flange of the member (mm or in.);

c

depth of neutral axis from extreme compression fiber (mm or in.);

d₁

depth of the extreme CFRP layer from the extreme compression fiber (mm or in.);

d_i

depth of the ith CFRP layer from the extreme compression fiber (mm or in.);

d_p

distance from the extreme compression fiber to the centroid of prestressing strands (mm or in.);

E_f

elastic modulus of CFRP (MPa or ksi);

$f_c^{\mathrm{\prime }}$

specified compressive strength of concrete at 28 days, unless another age is specified (MPa or ksi);

h_f

depth of compression flange (mm or in.);

h_f1

depth of the first, farther from neutral axis, compression flange of the member (mm or in.);

h_f2

depth of the second compression flange of the member (mm or in.);

M_n

nominal moment (kN · mm or kip-in.);

M_r

resistance moment $=\mathrm{\varnothing }{M}_n$ (kN · mm or kip-in.);

M_u

factored moment < M_r (kN · mm or kip-in.);

m

number of rows of CFRP strands;

n_i

number of CFRP strands in the ith layer;

P_e

effective prestressing force in the section (kN or kip);

s_i

distance between ith CFRP layer and extreme CFRP layer (in.) = d₁ − d_i;

β₁

stress block factor;

ɛ_cu

average concrete crushing strain, 0.003;

ɛ_gu

design guaranteed strain of CFRP including environmental and durability effects;

ɛ_pe

effective prestressing strain in CFRP after subtracting applicable prestress losses;

ɛ_i

net tensile strain at the ith layer of CFRP reinforcement determined from strain compatibility, taken equal to ɛ₁((d_i − c)/(d₁ − c));

ɛ₁

net tensile strain at the extreme CFRP layer; and

$\mathrm{\varnothing }$

resistance factor as specified in the manuscript.

References