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Evacuation Simulation under Threat of Wildfire—An Overview of Research, Develop...
Beyki, Shahab Mohammad; Santiago, Aldina; Laím, Luís; Craveiro, Hélder D.Wildfires have become a common incident over the past decades, and they have been threatening people’s lives and assets. In the communities close to wildlands or wildland–urban interfaces (WUI), these threats become increasingly serious, and in case of wildfires, people are advised or often have to evacuate the area to save their lives. In order to have a safe and effective evacuation, data on people’s behavior...
Buckling resistance of concrete-filled cold-formed steel (CF-CFS) built-up shor...
Rahnavard, Rohola; Craveiro, Hélder D.; Simões, Rui A.; Laim, Luís; Santiago, AldinaThe steel–concrete composite columns (SCCC) are widely used in the construction sector. The buckling phenomenon of the steel part (especially thin-walled steel) of the SCCC due to compressive loading is the governing characteristic of these columns. The present paper reports an experimental and numerical study on the compressive behavior of innovative concrete-filled (CF) closed built-up cold-formed steel (CFS)...
Equivalent temperature prediction for concrete-filled cold-formed steel (CF-CFS...
Rahnavard, Rohola; Craveiro, Hélder D.; Simões, Rui A.; Santiago, AldinaThis study aims to present an empirical formulation to predict equivalent temperature for steel and concrete components of the innovative concrete-filled cold-formed steel (CF-CFS) built-up column sections. This paper (part A) presents a 2-dimensional (2D) finite element modeling technique to predict temperature evolution through the CF-CFS built-up column sections. Heat transfer analysis was undertaken conside...
Equivalent temperature prediction for concrete-filled cold-formed steel (CF-CFS...
Rahnavard, Rohola; Craveiro, Hélder D.; Simões, Rui A.; Santiago, AldinaInnovative concrete-filled cold-formed steel (CF-CFS) built-up column sections subjected to axial compression and elevated temperatures were previously investigated, assessing their structural fire performance. However, the analytical fire resistance methodology presented in the EN1994-1-2 requires advanced heat transfer analysis to compute the temperature evolution of the steel and concrete components of the c...
Structural Fire Performance of Concrete-Filled Built-Up Cold-Formed Steel Columns
Craveiro, Hélder D.; Rahnavard, Rohola; Henriques, José; Simões, Rui A.Concrete-filled composite columns are widely used in the construction industry, exploiting the benefits of combining steel and concrete, providing, for instance, high load-bearing capacities and enhanced fire resistance. These solutions are extensively used in high-rise buildings and/or when high fire resistance performance requirements are imposed. In this exploratory research, a new type of concrete-filled co...
Tensile properties of S355 butt welds after exposure to high temperatures
Rodrigues, D. M.; Leitao, Carlos; Balakrishnan, M.; Craveiro, Hélder D.; Santiago, A.The influence of the exposure to high temperatures on the tensile properties and failure mode of butt-welded connections in 5355 J2 steel was assessed. With this aim, welds were produced using GMAW and FCAW semiautomatic processes. Transverse tensile specimens were extracted from the welded coupons, heated to high temperatures (300, 600 and 900 degrees C), cooled to room temperature and then loaded to failure. ...