This paper is presented a modal analysis of a steel flexible shell structure made of corrugation plates which is a main load-carrying element in soil-steel bridge situated in Giman (Sweden). Comparison and parametrizationwere carried out on two calculation models: a plane (2D) one and a spatial (3D) one. The rigid connection between the steel shell elements and the articulated (hinged) joints employed in the foundation are notable features of the bridge structure. The numerical analysis was performed by means of a FEM based software package. Two kinds of finite elements were used: beam and shell ones. The natural frequencies of the bridge shell structure were compared by means of subspace and reverse iteration methods. The steelflexible shell model was parameterized taking into account the effect of the variable (because of joints) characteristics of its shell elements connected with a foundation on the eigenvalues under the deadweight. In addition, the optimum number of finite elements in the models and the convergence of the results depending on the number of iterations were estimated. Conclusions were drawn on the basis of analysis.
Abstract