Numerical analysis of the effect of localised fires on composite steel concrete buildings

peer reviewe

A tool to design steel elements submitted to compartment fires—OZone V2. Part 1: pre- and post-flashover compartment fire model, Fire Safety Journal 38(5

Abstract The methodology implemented in the tool OZone V2 to design steel elements submitted to compartment fires is presented. Input needed to define a fire compartment are first quoted. The procedure to define the design fire is then explained. This procedure enables to take into account the benefits of active measures on the fire safety. The combined use of a two and a one zone model is then presented. A particular attention is given to the criteria of choice of the model and to the different scenarios that can occur. The calculation of steel element temperature is then explained. The proposed procedure takes into account the localised effect of a fire with the help of Hasemi's model. The fire resistance i s then calculated with the EUROCODE 3 methods. An application is finally presented

Response of RC Short Column Under Combined Fire and Axial Loading

This paper presents the behavior of six reinforced columns (RC) under two fire exposure conditions. To understand the role of stirrup spacing, the volumetric ratio of stirrups and all other parameters kept the same for all the set of columns. The volumetric ratio of stirrups in the columns is 0.5% with 6, 8, and 10 mm dia. stirrups at 75, 130, and 200 mm spacing, respectively. Experimental tests were conducted on six reinforced concrete columns of cross-section 230 × 230 mm2 and length 860 mm. The experimental investigations confirmed that the columns with 6 and 8 mm dia. stirrups show high load carrying capacity than the columns with 10 mm dia. stirrups, this trend is true when columns subjected to 120 and 180 min duration of heating under ISO fire curve. In case of columns subjected to 120 min ISO fire curve, columns with 8 mm dia. stirrups at 130 mm spacing carried approximately 10% higher load carrying capacity when compared to columns with 10 mm dia. stirrups at 200 mm spacing. Whereas columns heated for 180 min fire duration, columns with 6 mm and 8 mm dia. stirrups at 75 mm and 130 mm spacing, respectively, carried approximately 8% higher load carrying capacity compared to columns with 10 mm dia. stirrups at 200 mm spacing. © 2020, Springer Nature Singapore Pte Ltd

Experimental research on the determination of the main parameters affecting the behaviour of reinforced concrete columns under fire conditions

The design of reinforced concrete columns under fire conditions is generally made on the basis of national and international recommendations. The CEB/FIP recommendations have been used for many years. Recently, in the framework of the Eurocodes, the document ENV 1992-1-2 (Eurocode 2-1-2), Structural fire design, has been approved by Commission CEN/TC250/SC2 of the European Committee for Standardization. In the CEB/FIP documents and in Eurocode 2-1-2 the main part is devoted to design from tabulated data containing the dimensions of the cross-sections and values for the concrete cover. The use of simplified calculation methods is not current practice for concrete elements, while they are widely used in the case of steel. The determination of the temperature distribution in the cross-section does not facilitate the development of a simplified method. Furthermore, in columns there is a wide scatter of experimental results. In order to gain additional information, an extensive experimental research programme on the behaviour of reinforced concrete columns under fire conditions, financially supported by the Belgian Funds for Fundamental Collective Research (FRFC-FKFO), has been performed at the Universities of Liege and Ghent. In this article the results of this research are presented and the influence of the main parameters is analysed. </jats:p