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Fibers of bent-core liquid crystals present an internal structure of a rolled smectic layer and can be used as optical waveguides. We used a field-theoretical Monte Carlo simulation to analyze the internal configuration of such fibers as a function of the radial coordinate and to study their equilibrium sates. In contrast to previous studies, we analyzed the fully nonlinear model proposed in [Bailey et al., Phys. Rev. E, 2007, 75, 031701] and revised in [P\'erez-Ortiz et al., Phys. Rev. E, 2011, 84, 011701]. We found that, due to the non-differentiable character of such model, the Euler-Lagrange equations are not able to find all equilibrium states. Our Monte Carlo procedure identified both differentiable and non-differentiable equilibria and first order transitions between them. In all cases, the equilibrium states show inhomogenous configurations that display a boundary layer. This methodology can by applied to other models of liquid crystals that have more degrees of freedom, including those with non-differentiable minima. The equilibrium structures found can be used as inputs to model the transmission of light along the liquid crystal fibers., Comment: Second version. 12 pages, 7 figures in PDF format. Added references to typical values of spontaneous polarization of LC phases of fully organic and metallorganic bent-core mesogens