The results of a structural analysis of elliptical-shaped precast concrete arch structures and circular-shaped arches being considered by the minnesota department of transportation are summarised in this paper. These arch structures were analysed to compare the effect of geometry on structural performance. They were analysed using the finite element method by placing identical load conditions on each arch. Half of each arch was modelled, based on symmetry, with no rotation allowed at the arch crown. The effects of cracking, critical stresses, and displacements were tabulated. Temperature stresses and shrinkage of the concrete were also introduced into the shape comparisons. Conclusions are included which indicate the optimum geometric shape and considerations for further analysis of different loading combinations.
Samenvatting