This document discusses the structural behavior of curved box girder bridges. It analyzes models of curved box girder bridges with varying parameters like span length, radius of curvature, and loadings using finite element analysis software. The results show that bending moments and shear forces do not significantly change with radius of curvature, but torsional moments greatly increase with decreasing radius. Mid-span deflections also increase with longer spans and smaller radii. In conclusion, torsional behavior is most affected by changes in curvature, while bending and shear are relatively unaffected.