Experimental investigation on the fire behaviour of rectangular and elliptical slender concrete-filled tubular columns

Espinós, Ana; Romero, Manuel L.; Serra, E.; Hospitaler, Antonio

doi:10.1016/j.tws.2015.03.018

Cited by 51 publications

(31 citation statements)

References 22 publications

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“…However, there are some concerns on the fire performance of slender columns that failed prematurely [1]- [4]. Innovative solutions are therefore sought to help to improve the performance of this type of composite columns in the fire situation.…”

Section: Introductionmentioning

confidence: 99%

Fire performance of innovative steel-concrete composite columns using high strength steels

Espinós

Romero

Lam

2016

Thin-Walled Structures

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This paper presents the results of a numerical investigation on strategies for enhancing the fire behaviour of concrete-filled steel tubular (CFST) columns by using inner steel profiles such as circular hollow sections (CHS), HEB profiles or embedded steel core profiles. A three-dimensional finite element model is developed for that purpose, which is capable for representing the various types of sections studied and the nonlinear behaviour of the materials at elevated temperatures. High strength steel is considered in the numerical model, as a possible way to lengthen the fire endurance. The numerical model is validated against experimental results available in the literature for various types of steel-concrete composite sections using inner steel profiles, obtaining satisfactory results. Based on the developed numerical model, parametric studies are conducted for investigating the influence of the cross-sectional geometry and the steel grade of the inner profiles on the fire performance of these composite columns, for eventually providing some practical recommendations.

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Section: Introductionmentioning

confidence: 99%

Fire performance of innovative steel-concrete composite columns using high strength steels

Espinós

Romero

Lam

2016

Thin-Walled Structures

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“…In this section, the proposed method is compared against the results of real fire tests carried out by the authors in the experimental campaign of the European Project FRISCC, published in previous papers [18] [19]. From the entire experimental results database, only those cases with eccentric load and meeting the requirements L/D < 30, R ≥ 30 minutes were selected for the validation of the proposed method.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

10.14: Fire design method for eccentrically loaded concrete‐filled steel tubular columns based on interaction diagrams

et al. 2017

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In this paper, a simplified design method for evaluating the fire resistance of eccentrically loaded concrete filled steel tubular (CFST) columns is presented. The developed method is based on the results of an extensive parametric analysis conducted in the framework of the RFCS European Project FRISCC (Fire resistance of innovative and slender concrete filled tubular composite columns) and is currently being evaluated by the Working Group SC4.T4 for its approval as the method to replace the current Annex H in EN1994-1-2, which was proved in previous investigations to be unsafe for slender columns. The method presented in this paper is based on the provisions of Clause 6.7.3.6 of EN 1994-1-1 for room temperature design, using bending momentaxial force interaction curves specially built up for the fire situation. These interaction curves are obtained by considering several possible positions of the plastic neutral axis within the cross-section, and determining the internal forces and moments from the plastic stress blocks, which results particularly challenging for CFST sections subjected to elevated temperatures, given the thermal gradient that occurs within the cross-section. For simplifying this process, equivalent temperatures are proposed, which allow using a single uniform temperature for representing each part of the composite section. Appropriate coefficients are also proposed for evaluating the effective flexural stiffness for second-order analysis at elevated temperatures. The influence of the cross-section shape, load eccentricity and percentage of reinforcement is accounted for in the proposal.

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“…The previously described numerical models were validated against the experimental results from an extensive fire testing campaign carried out by the authors within the project FRISCC [31], [32] obtaining a successful fitting, see Table 1. Although the 3D model was already validated in previous works [23], a new validation was needed in order to check its accurate behaviour for all sections shapes (CHS, SHS, RHS and EHS).…”

Section: Validation Of the Numerical Modelsmentioning

confidence: 99%

Proposal of a new method in EN1994-1-2 for the fire design of concrete-filled steel tubular columns

Albero

Espinós

Romero

et al. 2016

Engineering Structures

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Previous investigations proved the unsafety of the current design guidelines in Annex H of EN 1994-1-2 for the calculation of the fire resistance of slender concrete-filled steel tubular (CFST) columns. In this paper, a new simplified design method based on the general rules in Clause 4.3.5.1 of EN 1994-1-2 is presented for correcting this inaccuracy. For the development of the method, an extensive parametric study consisting of about 20.500 analysis cases was carried out by using numerical models, which in turn were validated against a wide range of experimental results. The proposed method provides a significant extension over the current EN 1994-1-2 applicability limits, reaching high member slenderness, large eccentricities and being valid for all the commercially available geometries, including elliptical hollow sections. The design proposal is divided into two parts: thermal, where a simplified cross-sectional temperature field can be obtained based on equivalent temperatures for the composite section constituents, and mechanical, where a full method for evaluating the ultimate buckling load in the fire situation is given. The proposed method is valid for axially and eccentrically loaded columns, accounting for eccentricities on both minor and major axis and reaching large eccentricities of e/D = 1. Finally, it is proved that the proposed method provides safe predictions as compared to experimental results and meets the CEN/TC250/SC4 accuracy criteria.

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Experimental investigation on the fire behaviour of rectangular and elliptical slender concrete-filled tubular columns

Cited by 51 publications

References 22 publications

Fire performance of innovative steel-concrete composite columns using high strength steels

Fire performance of innovative steel-concrete composite columns using high strength steels

10.14: Fire design method for eccentrically loaded concrete‐filled steel tubular columns based on interaction diagrams

Proposal of a new method in EN1994-1-2 for the fire design of concrete-filled steel tubular columns

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