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Dynamical simulations and scaling arguments are used to study thecurrent-voltage (IV) characteristics of a two-dimensional model of resistivelyshunted Josephson-junction arrays in presence of percolative disorder, at zeroexternal field. Two different limits of the Josephson-coupling concentration$p$ are considered, where $p_c$ is the percolation threshold. For $p$ $>$ $p_c$and zero temperature, the IV curves show power-law behavior above a disorderdependent critical current. The power-law behavior and critical exponents areconsistent with a simple scaling analysis. At $p_c$ and finite temperature $T$,the results show the scaling behavior of a T=0 superconducting transition. Theresistance is linear but vanishes for decreasing $T$ with an apparentexponential behavior. Crossover to non-linearity appears at currentsproportional to $% T^{1+\nu_T}$, with a thermal-correlation length exponent$\nu_T$ consistent with the corresponding value for the diluted XY model at$p_c$.Comment: Revtex, 9 postscript pages, to appear in Phys. Rev.

Current-voltage characteristics of diluted Josephson-junction arrays: Scaling behavior at current and percolation threshold