COSD	conventional OSD
D	cumulative fatigue damage of fatigue details
DOF	degrees of freedom
De	equivalent fatigue damage of each fatigue detail
d a,U	the maximum offset of autonomous vehicle from lane centerline
FEM	finite element model
FLM	fatigue load model
Fa(x)	modified PDF of the transverse distribution of autonomous vehicles
Fa,B(x)	modified PDF of the transverse distribution of autonomous vehicles when following a bimodal Gaussian distribution
Fa,U(x)	PDF of the transverse distribution of autonomous vehicles when following a uniform distribution
Fh(x)	modified PDF of the transverse distribution of human-driven vehicles
Fm(x)	modified PDF of the transverse distribution of mixed traffic flow
fa(x)	original PDF of the transverse distribution of autonomous vehicles
fa,B(x)	original PDF of the transverse distribution of autonomous vehicles when following a bimodal Gaussian distribution
fh(x)	original PDF of the transverse distribution of human-driven vehicles
KC	fatigue strength constant corresponding to high-stress range
KD	fatigue strength constant corresponding to low-stress range
LWCD	lightweight composite OSD
Ne	equivalent number of average daily truck traffic within a single lane
Ni	number of stress cycles corresponding to the stress range of ΔSi at which fatigue failure occurs
Nj	number of stress cycles corresponding to the stress range of ΔSj at which fatigue failure occurs
ni	number of actual stress cycles experienced by fatigue detail corresponding to stress range of ΔSi
nj	number of actual stress cycles experienced by fatigue detail corresponding to stress range of ΔSj
OSD	orthotropic steel deck
PDF	probability density function
p	proportion of autonomous vehicles in mixed traffic flow
RC	rib-to-crossbeam
RD	rib-to-deck
S hot	hot spot stress
S 0.5t	stress at reference node that is 0.5 × t away from the node of interest
S 1.5t	stress at reference node that is 1.5 × t away from the node of interest
S 4mm	stress at reference node that is 4 mm away from the node of interest
S 8mm	stress at reference node that is 8 mm away from the node of interest
S 12mm	stress at reference node that is 12 mm away from the node of interest
t	thickness of plate on which the weld toe is located
UHPC	ultrahigh performance concrete
x	transverse offset of the vehicle from lane centerline
Y	fatigue life of fatigue details
Y h	fatigue life of fatigue details under the action of human-driven vehicles
Y m	fatigue life of fatigue details under the action of mixed traffic flow
ΔσC	detail category of fatigue details
ΔσD	constant amplitude fatigue limit of fatigue details
ΔσL	cut-off limit of fatigue details
ΔSi	the i-th high-stress range
ΔSj	the j-th low-stress range
μ 1	mean of the first peak of fa,B(x)
μ 2	mean of the second peak of fa,B(x)
μ a	mean of fa(x)
μ a,B	absolute value of μ1 and μ2 when the bimodal Gaussian distribution is symmetric with lane centerline
μ h	mean of fh(x)
σ a	standard deviation of fa(x)
σ h	standard deviation of fh(x)