Structural Fire Performance of Concrete-Filled Built-Up Cold-Formed Steel Columns

• Autor(a) principal: Craveiro, Hélder D.
• Data de Publicação: 2022
• Outros Autores: Rahnavard, Rohola, Henriques, José, Simões, Rui A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/103358; https://doi.org/10.3390/ma15062159
• topic: cold-formed steel; built-up section; concrete-filled; load-bearing capacity; local-global buckling interaction; global buckling; fastener spacing

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 composite column is investigated using fire resistance tests. Promoting the use of cold-formed steel products and developing innovative solutions for low-rise buildings with lower passive fire protection requirements led to the solutions presented in this research. Hence, a set of fire-resistance tests were undertaken on concrete-filled closed built-up cold-formed steel columns, where single cold-formed steel shapes are combined and fastened to create a box-shaped cross-section. The experimental results were then compared with the corresponding bare steel solutions to assess, in detail, the observed enhancements. Additionally, the effect of restraint on thermal elongation was assessed.