Nonlinear structural design optimization of cable stayed bridges

Scientific Study from the year 2013 in the subject Engineering - Civil Engineering grade: - University of Weimar course: Cable Stayed Bridges language: English abstract: In this research many models of a cable stayed bridge were generated using ABAQUS finite element commercial software for the purpose of proceeding with nonlinear design optimization on the shape and topology of the structure. The cable stayed bridge models in all cases are with a constant length and width for the deck also the pylons height under and above the deck is constant but the shape of stay cables arrangement varies to three main famous arrangements which are Fan Semi harp and Harp.In addition to change in the pylons shape which are three known shapes Double out Single Center and Single inclined out and it is worthy to mention that in all cases of the shape optimization of the pylons the stay cables arrangements are Fan style andby governing computational nonlinear optimization process on the finite element models in all cases of shape and topology optimization through using static general step for analysis and a certain meshing type with global seeding size for the Beam elements with a fixed and pinned boundary conditions for the deck supports and fixed boundary for the pylons.Concentrated static loads assigned on the same positions on the deck for all models cases. A numerical optimization and graphical simulation of the results were used to determine many responsesin the model cases which areReactions Deflections and Mises stresses in the structural models of the cable stayed bridge especially at the deck pylons and the stay cables which are the main components of the structure also the same step in the deck and pylons supportshas been done for optimization outputs. It is apparent and clear that the cable stayed model with the Fan arrangement of the stay cables showed efficiency and the best topological model