A unified method for calculating fire resistance of solid and hollow concrete-filled steel tube columns based on average temperature

Yu, Mao-Hong; Zha, Xiaoxiong; Ye, Jianqiao; Wang, Baolin

doi:10.1016/j.engstruct.2014.03.038

Cited by 37 publications

(40 citation statements)

References 24 publications

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“…where the bearing strength f src (T (t)) of the HRCFST section at high temperature can be derived from equation (27), which can be similarly expressed as follows…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…Thus, Eurocode 4 (EN 1994-1-2) 29 data are dependent on estimating its strength with the increase in temperature, which has been simplified in Yu et al 27 as follows…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…In this section, the axial compression bearing capacity of the HRCFST column at ambient temperature in equation (27) can be transformed into the axial compression load of the HRCFST and HCFST columns with stability concern at high temperature according to the average temperature distribution on their section components as stated in section ''The formulas of calculating average temperature on the HRCFST section.'' Under standard fire conditions, cross-sectional areas of the recycled concrete and steel tube remain unchanged.…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…The average temperatures of recycled and normal concrete are the mean value of the temperature distribution of the recycled and normal concrete section and similarly for the steel tubular section. According to the Green function and the difference of performance of recycled and normal concrete, 27 the formulas for average temperature on the steel and recycled and normal concrete sections can be formulated as equations (29) and (30) by means of regression analysis from 588 test data, respectively, as follows…”

Section: Theoretical Formulationmentioning

confidence: 99%

See 3 more Smart Citations

Study of recycled concrete–filled steel tubular columns on the compressive capacity and fire resistance

Wang

Zha

Liu

et al. 2017

Advances in Mechanical Engineering

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This study presents the analytical formulation of circular steel tubular column with hollow concrete section. This unified analytical formulation can evaluate the axial compression capacity and buckling load of this innovative composite section at normal and high temperature levels, as well as the normal and recycled concrete in a similar fashion. Therefore, the confinement effect on this composite section is uncertain, which in turn leads to complications in axially loaded compression evaluation, because the inner surface of the hollow concrete section is unrestrained. To this end, this study adopts the effective constraint, which can further assist in transmitting from normal concrete to recycled concrete material to address sustainability issues. In addition, the concept of average temperature is proposed to formulate the failure load of circular hollow recycled concrete-filled steel tubular section and circular hollow concrete-filled steel tubular section columns at high temperature.

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“…where the bearing strength f src (T (t)) of the HRCFST section at high temperature can be derived from equation (27), which can be similarly expressed as follows…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…Thus, Eurocode 4 (EN 1994-1-2) 29 data are dependent on estimating its strength with the increase in temperature, which has been simplified in Yu et al 27 as follows…”

Section: Theoretical Formulationmentioning

confidence: 99%

Section: Theoretical Formulationmentioning

confidence: 99%

Section: Theoretical Formulationmentioning

confidence: 99%

See 2 more Smart Citations

Study of recycled concrete–filled steel tubular columns on the compressive capacity and fire resistance

Wang

Zha

Liu

et al. 2017

Advances in Mechanical Engineering

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“…However, this method assumed an equivalent temperature for the concrete core so the cross-sectional temperature distribution was no explicitly calculated. In the same line, Yu et al [9] developed a simple calculation method for the fire resistance of CFT columns but again on the assumption of average temperatures for both steel tube and concrete core crosssections.…”

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confidence: 99%

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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Fire resistance of concrete-filled steel tube columns with preload. Part I: Experimental investigation

Tan

Huang

et al. 2019

Composite Structures

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Preload in a cast-in-situ concrete-filled steel tube (CFST) structure is an important parameter that has been studied and considered in design and construction. However, the impact of a preload on fire resistance of CFST has not been taken into account in the existing design method of CFST under fire. In this paper, twelve CFST columns with and without preload in the steel tubes are experimentally studied to investigate their heating process, failure modes, thermal and structural responses. The test results show that preload of the steel tube has significant impact on the fire resistance of some of the columns. Further investigations on this important observation will be done numerically in a companion paper [24] to carry out a more comprehensive parametric study.

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A unified method for calculating fire resistance of solid and hollow concrete-filled steel tube columns based on average temperature

Cited by 37 publications

References 24 publications

Study of recycled concrete–filled steel tubular columns on the compressive capacity and fire resistance

Study of recycled concrete–filled steel tubular columns on the compressive capacity and fire resistance

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

Fire resistance of concrete-filled steel tube columns with preload. Part I: Experimental investigation

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