Application of topology optimisation to the design of steel I-section webs

This research focuses on the application of structural topology optimisation the design of steel I-section beam web openings. A topology optimisation study is performed for the first time on the web of a steel I-section beam. A beam web design is then proposed based on the results of the topology optimisation study. A nonlinear finite element analysis technique is employed to determine the load carrying performance of the optimised beam in comparison to the conventional, widely used, cellular type beam. It is found that the optimised beam over performs in terms of load carrying capacities and stress intensities. Barriers to the implementation of the topology optimisation technique to the routine design of beam web are highlighted. In detail, a parametric topology optimisation study is conducted in order to determine the optimum opening topology for the wide range of beam cross sections that are found in practice. Thereafter, a generalised optimum web opening configuration is suggested based on the results of the parametric study. It is anticipated that a shape optimisation study will be required to maximise the efficiency of beams with this optimum web opening configuration.