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We present the results of two-component (disc+bar) and three-component(disc+bar+bulge) multiwavelength 2D photometric decompositions of barredgalaxies in five SDSS bands ($ugriz$). This sample of $\sim$3,500 nearby($z<0.06$) galaxies with strong bars selected from the Galaxy Zoo citizenscience project is the largest sample of barred galaxies to be studied usingphotometric decompositions which include a bar component. With detailedstructural analysis we obtain physical quantities such as the bar- andbulge-to-total luminosity ratios, effective radii, S\'ersic indices and coloursof the individual components. We observe a clear difference in the colours ofthe components, the discs being bluer than the bars and bulges. An overwhelmingfraction of bulge components have S\'ersic indices consistent with beingpseudobulges. By comparing the barred galaxies with a mass-matched andvolume-limited sample of unbarred galaxies, we examine the connection betweenthe presence of a large-scale galactic bar and the properties of discs andbulges. We find that the discs of unbarred galaxies are significantly bluercompared to the discs of barred galaxies, while there is no significantdifference in the colours of the bulges. We find possible evidence of secularevolution via bars that leads to the build-up of pseudobulges and to thequenching of star formation in the discs. We identify a subsample of unbarredgalaxies with an inner lens/oval and find that their properties are similar tobarred galaxies, consistent with an evolutionary scenario in which barsdissolve into lenses. This scenario deserves further investigation through boththeoretical and observational work.

Galaxy Zoo: Secular evolution of barred galaxies from structural decomposition of multi-band images