Public defence in civil engineering, Saani Shakil, M.Sc.
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Long-span and high-strength steel beams under nonuniform temperature fields induced by fire: Definition of material properties and numerical simulation
High strength steel (HSS) because of its high strength compared to mild steel enhances the robustness of structures as well as reduce their carbon footprint by decreasing the amount of steel. At elevated temperatures, the scatter among the material properties of HSS in literature has impeded the formation of a single set of values that can be used for material modelling. Therefore, the thesis explored the characterization of the material parameters of S700 grade of one type of HSS at elevated temperatures through two different tensile testing methods.
In open-plan spaces, long-span beams are exposed to temporally and spatially nonuniform temperature fields because the fire can remain localized, or move across the floor and can therefore be called ‘travelling fire’. Another example of temperature nonuniformity including heating-cooling cycles is fire intervention with water sprays. The analysis of such nonlinear phenomena requires the use of advanced fire and structural simulations, so that the three-dimensional time-dependent temperature field created by fire can be considered in structural analyses. In this research, the three-dimensional temperature fields as a function of time received by ‘computational fluid dynamic simulations’ were transferred with a coupling tool to structural analyses which was performed by the finite element method. This research furthers the understanding of the fire behaviour of long-span and high-strength steel beams and their structural design.
The applications of this research are connected with the fields of structural fire-safety design and firefighting.
Opponent: Professor Tom Molkens, KU Leuven, Belgium
Custos: Professor Jari Puttonen, Aalto University School of Engineering, Department of Civil Engineering
Contact information of the doctoral student: Saani Shakil, saani.shakil@aalto.fi, +358 (0)50 4497540
The public defence will be organised on campus (auditorium R1, Rakentajanaukio 4).
The thesis is publicly displayed 10 days before the defence in the publication archive Aaltodoc of Aalto University.