Browsing by Author "Santiago, Aldina"
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- Residual strength of a steel-concrete composite structure subjected to a design seismic event by firePublication . Nogueiro, Pedro; Santiago, Aldina; Silva, Luís Simões; Bento, Rita; Vila Real, Paulo M.M.This paper presents a numerical investigation of the residual strength of a typical PR momentresistant multi-storey steel framed structure, subjected to a design seismic event followed by fire. In order to allow a calibration with some real results from fire tests on a natural scale, the architectural and structural definitions of the eight-storey steel Cardington building were chosen as the reference case, adapted to deal with basic seismic requirements. The seismic action was simulated with an artificial accelerogram with PGA of 0.6g, chosen to achieve significant energy dissipation in the joints. The adopted fire event is limited to an isolated compartment and it is defined as the natural fire observed during a full-scale fire test carried out at the BRE. Finally, the results are discussed in terms of robustness requirements for extreme events.
- The effect of residual stresses in the lateral-torsional buckling of steel I-beams at elevated temperaturesPublication . Vila Real, Paulo M.M.; Cazeli, Ronisi; Silva, Luís Simões; Santiago, Aldina; Piloto, P.A.G.When a beam is bent about its major axis it may twist and move laterally, before it reaches in bending. Although the problem, of lateral-torsional buckling of steel beams at room temperature has a well established solution, the same problem at elevated temperature has not. A numerical investigation of the laleral-torsional of buckling of steel I-beams subjected to a temperature variation from room temperature up to 700 °C, with the aim of assessing the effects of the residual stresses in this mechanism of failure, is presented in this page. To this purpose, a geometrically and materially non-linear finite element program, has been used to determine the lateral-torsional resistance of steel I-beams at elevated temperatures, using the material properties of Eurocode 3, part 1-2. The numerical results have been compared to the results of the simple model presented in Eurocode 3, Part 1-2 (1995) and a new proposal that is being considered for approval.