Fire Resistance of Circular Steel Columns Filled with Bar‐Reinforced Concrete

Lie, T. T.

doi:10.1061/(asce)0733-9445(1994)120:5(1489)

Cited by 286 publications

(237 citation statements)

References 2 publications

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“…Previously, Lie [6] had already taken as a basis the same approach to solve the heat transfer problem for circular CFT 8 columns but ignoring the gap conductance that appears between the steel tube and the concrete core which clearly reduces the thermal response accuracy.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…The nomenclature used by Lie [6] will be maintained in order to make easier any comparison between both formulations. Due to axisymmetric conditions, the heat transfer problem becomes unidirectional what simplifies the discretization of the section as well as the calculation process.…”

Section: Discretization Of the Sectionmentioning

confidence: 99%

“…The main improvement with respect to the method presented by Lie [6] lies in the consideration of the existence of a gap conductance at the steel-concrete interface with the aim of obtaining a realistic thermal response.…”

Section: Discretization Of the Sectionmentioning

confidence: 99%

“…Hence, Lie [6] developed a formulation for circular CFT columns based on the methodology proposed by Dusinberre [7]. Again, perfect contact was assumed at steel-concrete interface.…”

Section: Introductionmentioning

confidence: 99%

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Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Ibáñez

Aguado

Romero

et al. 2015

Fire Safety Journal

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Ibañez C, Aguado JV, Romero ML, Espinos A, Hospitaler A. Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section. Fire Safety Journal. 2015; 78:10-23. doi: 10.1016/j.firesaf.2015 ABSTRACTIn this work, a method for a realistic cross-sectional temperature prediction and a simplified fire design method for circular concrete filled tubular columns under axial load are presented. The generalized lack of simple proposals for computing the crosssectional temperature field of CFT columns when their fire resistance is evaluated is evident. Even Eurocode 4 Part 1-2, which provides one of the most used fire design methods for composite columns, does not give any indications to the designers for computing the cross-sectional temperatures. Given the clear necessity of having an available method for that purpose, in this paper a set of equations for computing the temperature distribution of circular CFT columns filled with normal strength concrete is provided. First, a finite differences thermal model is presented and satisfactorily validated against experimental results for any type of concrete infill. This model considers the gap at steel-concrete interface, the moisture content in concrete and the Ibañez C, Aguado JV, Romero ML, Espinos A, Hospitaler A. Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section. Fire Safety Journal. 2015; 78:10-23. doi: 10.1016/j.firesaf.2015 2 temperature dependent properties of both materials. Using this model, a thermal parametric analysis is executed and from the corresponding statistical analysis of the data generated, the practical expressions are derived. The second part of the paper deals with the development of a fire design method for axially loaded CFT columns based on the general rules stablished in Eurocode 4 Part 1-1 and employing the concept of room temperature equivalent concrete core cross-section. In order to propose simple equations, a multiple nonlinear regression analysis is made with the numerical results generated through a thermo-mechanical parametric analysis. Once more, predicted results are compared to experimental values giving a reasonable accuracy and slightly safe results.

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Section: Heat Transfer Modelmentioning

confidence: 99%

Section: Discretization Of the Sectionmentioning

confidence: 99%

Section: Discretization Of the Sectionmentioning

confidence: 99%

“…Hence, Lie [6] developed a formulation for circular CFT columns based on the methodology proposed by Dusinberre [7]. Again, perfect contact was assumed at steel-concrete interface.…”

Section: Introductionmentioning

confidence: 99%

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Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Ibáñez

Aguado

Romero

et al. 2015

Fire Safety Journal

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“…Some studies have been conducted on the static performance of RCFST columns [12][13][14][15][16][17][18][19][20]. Lie [14] gave the resistance of circular steel columns filled with bar-reinforced concrete.…”

Section: Introductionmentioning

confidence: 99%

Study on Axial Compression Bearing Capacity of Reinforced Concrete Filled Steel Tube Members

Zha¹,

Li²,

Wang³

et al. 2016

Volume 12 Number 2

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ABSTRACT:The bearing capacity equation of reinforced concrete filled steel tube (RCFST) members under axial loads is derived by using the combined unified and limit equilibrium theories. The concrete strength increase due to the constraint effect of the steel tube is taken into account through the use of unified theory; whereas the concrete strength increase due to the constraint effect of the stirrups is considered through the use of the limit equilibrium theory. Three-dimensional nonlinear finite element analysis and experimental tests were carried out and the corresponding results are reported in this paper. The comparisons of the numerical, experimental and theoretical results show that there are in good agreement between these three different methods. However, the present theoretical analysis model is not only simple and convenient to use but also consistent with existing Chinese design codes for CFST columns.

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10.28: Fire performance of concrete filled steel tubular columns with built‐in stirrups

Zang

Zhang³

2017

ce papers

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Two concrete filled steel tubular columns with built-in stirrups (i.e., Specimens 1 and 2) and one control column (i.e., concrete filled steel tubular column without built-in stirrups, Specimen 3) were exposed to the ISO834 standard fire, and fire behaviors of the three columns were investigated and compared with each other. The steel usage of Specimen 1 (2) (i.e., total weight of the steel tube and stirrups) was the same as that of Specimen 3 (i.e., weight of the steel tube). The distance between the stirrup's centerline and inner surface of the steel tube was 20mm for Specimen 1, and 50mm for Specimen 2. The height and outer diameter of all the three columns were, respectively, 3800mm and 320mm. The axial load applied to Specimens 1 and 2 was identical with that applied to Specimen 3. Test results show that when the steel usage keeps unchanged, the fire endurance of the concrete filled steel tubular column with built-in stirrups is much longer than that of the column without built-in stirrups. Finally, a finite element analysis (FEA) model was developed and verified against the experimental results, and a parametric study has been preliminarily performed to reveal the fire performance of the concrete filled steel tubular columns with built-in stirrups.Keywords: concrete filled steel tube, fire performance, built-in stirrup 2 EXPERIMENTAL PROGRAM Specimen preparation and material propertiesSchematic diagrams of two CFST columns with built-in stirrups (Specimen 1 and Specimen 2) and one conventional CFST column (Specimen 3, control specimen) are shown in Fig. 1. All the three

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Fire Resistance of Circular Steel Columns Filled with Bar‐Reinforced Concrete

Cited by 286 publications

References 2 publications

Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Study on Axial Compression Bearing Capacity of Reinforced Concrete Filled Steel Tube Members

10.28: Fire performance of concrete filled steel tubular columns with built‐in stirrups

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