1,720,986 research outputs found
Tests on intumescent paints for fire protection of existing steel structures
No full textIntumescent coatings (i.c.) are often used on steel structures to reduce the heating during a fire when the structural, aesthetic, and architectural value of the structural members should be preserved. Indeed, i.c. form a thin protective layer on the surface. When the i.c. are exposed to fire or excessive heat, volume expansion and density reduction take place. Therefore, the protective layer absorbs heat and protects the structural member from damage or excessive deformation. To perform rigorous and realistic analyses on protected steel members, thermal properties of all materials, including i.c., should be known. Nevertheless, the thermal properties of these systems are not available, especially for existing buildings. This paper shows experimental test on steel members protected with i.c., taken from an existing structure, which is thirty years old. I.c. thickness measurement and adhesion tests were performed in situ, whereas furnace tests were carried out at the Laboratory of the Italian National Fire Services. The tested steel members have various section factors and behave two fire curves (Standard Fire and Smouldering Fire) during the tests in furnace. The furnace tests were performed on steel members with original i.c. (reference) and steel members protected by applying a new i.c. after removing the existing paint (restored) or simply by applying it on the existing paint (repainted). The results show that the existing i.c. is not very efficient, whereas the restored and repainted specimens showed similar performance. A law for the thermal conductivity of the i.c. was obtained from the experimental results, according to an European code, and used in a finite element numerical mode
General approach for the assessment of the fire vulnerability of existing steel and composite steel-concrete structures
No full textThe fire safety of existing structures is very important from the socio-economic point of view and has high social impact for civil, industrial and commercial buildings. The minimum fire resistance of structures is verified through some regulations, drafted to ensure safety for occupants and rescue teams as well as limited structural damage. Fire design rules are not always directly applicable to existing buildings, which need specific provisions to take account of uncertainties on the structural geometry, and the mechanical and thermal properties of the materials. This paper aims to provide guidance about the assessment of structural fire safety of existing buildings during a fire. A possible approach is obtained by integrating the general approach suggested by the Eurocodes for the structural assessment of existing buildings with more specific details concerning the structural fire safety check. The approach focuses on the criteria and the tests required to assess thermal properties and effectiveness of protective materials. The methodology is applied to assess an existing steel building protected with intumescent coating (IC), designed and built about 30 years ago. Applied to assess the existing IC, the procedure also provides data required to design a new protection system with advanced calculation methods according to a performance-based approach
Sicurezza strutturale in caso di incendio di edifici esistenti in acciaio: un possibile approccio generale e applicazione al caso delle vernici intumescenti
No full textApproach for modelling thermal properties of intumescent coating applied on steel members
No full textIntumescent coatings for fire safety of existing steel buildings in the European Framework
No full textUn possibile approccio generale per la sicurezza strutturale antincendio di edifici di acciaio esistenti
No full textSicurezza Antincendio di strutture in acciaio: nuova progettazione e valutazione dell’edilizia esistente
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Seismic and Fire Assessment and Upgrading Process for Historical Buildings: The Case Study of Palazzo Colonna in Caggiano
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