The photometric structure of 23 interacting galaxies is analyzed, It is sho
wn that equivalent photometric profiles, if used for statistical analyses o
f the global structure of the disks of spiral galaxies, yield the same resu
lts as major-axis profiles. When analyzing nonaxisymmetric and faint object
s, the equivalent profiles should be preferred to both the major-axis and e
lliptically averaged profiles. The studies of integral characteristics of b
ulges of interacting spiral galaxies showed that the parameters of these ob
jects obey the mu(e)-r(e) relation for normal spirals over a wide range of
surface-brightness (similar to 10(m)) and linear-dimension (similar to 3 x
10(2)) values, This fact may imply that strong gravitational perturbations
have little effect on dense central galaxy regions, leaving the bulges in a
state that is very close to equilibrium The central parts of disks in inte
racting spirals are, on the average, similar to 1(m) brighter than the corr
esponding regions in isolated galaxies, which is probably attributable to e
nhanced star-formation process, Integrated photometric parameters of the di
sks of local interacting galaxies are similar to those of spiral galaxies o
f comparable size observed at z similar to 1. The latter are also character
ized by high surface brightness. Among them, interacting or disturbed objec
ts comprise a sizable fraction. It may be assumed that gravitational pertur
bations and external accretion contribute significantly to the observed evo
lution of disk parameters in large spiral galaxies, when z similar to 1.