Realistic modelling of thermal and structural behaviour of unprotected concrete filled tubular columns in fire

Ding, Jian; Wang, Yongchang

doi:10.1016/j.jcsr.2007.09.014

Cited by 144 publications

(110 citation statements)

References 7 publications

(7 reference statements)

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“…In the numerical plane model, used to produce the simplified equations, the resistance for heat conduction along the interface of the steel tube and the concrete core has been neglected, since it was considering the value of 200 W/m²K, recommended by Ding and Wang (2008). Significantly lower temperatures result, however the value indicated for the thermal resistance coefficient provided satisfactory results.…”

Section: Discussionmentioning

confidence: 99%

Temperature field of concrete-filled steel tubular columns in fire

Rodrigues

Júnior

2017

REM, Int. Eng. J.

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The composite structures formed by the association of steel profiles with concrete have shown to be an advantageous alternative, improving the behavior of the steel structures concerning their load capacity, stiffness, and durability, under fire conditions. The concrete-filled tubular columns have become an attractive alternative for the civil construction area, offering constructive and esthetic advantages. The Eurocode 4 (EN 1994(EN -1-2, 2002 and ABNT NBR 14323:2013 show simple methods for the design of the composite columns under fire situations. Nevertheless, these present limitations in their application. In addition, regarding the determination of the temperature field in the cross section, the Eurocode 4 (EN 1994-1-2, 2002) describes a specific procedure for columns with section profile covered with concrete, but it is neglectful about concrete-filled tubular columns. The goal of this paper is to present a simplified procedure to determine the temperature registered in concrete-filled steel columns and apply the procedure to columns with square section tubes. The temperature distribution was determined by simulations using the computer package ABAQUS (Dessault Systemes Simulia Corp. 2013). After the studies, it has been considered that the procedure described in this paper is an effective alternative for the determination of the field's temperature and for the application of the design of the concrete-filled columns under fire conditions.

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Section: Discussionmentioning

confidence: 99%

Temperature field of concrete-filled steel tubular columns in fire

Rodrigues

Júnior

2017

REM, Int. Eng. J.

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“…For CFST columns in fire, it is possible that a gap will form between the steel hollow section and concrete core due to their different expansion. Research by Ding and Wang [17] indicated that introducing an air gap will give a higher fire resistance times than without a gap for CFST columns without external fire protection. However, for CFST columns with high degree of external fire protection, introducing an air gap might lead to prediction of lower column fire resistance period but the difference of fire resistance period is very small.…”

Section: Numerical Proceduresmentioning

confidence: 99%

A Numerical Study on the Effect of Concrete Infill and Intumescent Coating to Fire-Resistant Behaviour of Stub Elliptical Steel Hollow Sections Under Axial Compression

Dai¹,

Lam²

2014

Volume 10 Number 3

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This paper presents a numerical study on the effect of concrete infill and intumescent coating to the fire resistant behaviour of stub elliptical concrete filled steel tubular (CFST) columns under standard fire. The selected elliptical steel hollow sections in this research cover the common used elliptical sections in current construction market; from 200  100 mm to 500  250 mm with wall thicknesses varying from 5 to 12.5 mm. Temperature distribution, critical temperature and fire exposing time of selected stub elliptical columns with concrete infill and other intumescent coating fire protection options under axial compression were extracted from numerical simulations using commercial FE package ABAQUS. Based on the comparison and analysis of the obtained results, the effect of concrete core and external intumescent coating to the thermal and structural fire-resistant behaviour of stub elliptical columns are discussed. Simple formulae are proposed to assess the critical steel temperature and maximum axial compressive load of stub elliptical CFST columns in standard fire.

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“…[3]). It is noteworthy that EC4 states that in calculating the temperature distribution the thermal resistance between the steel wall and the concrete may be neglected, despite the fact that an air gap typically forms at this interface during fire [27].…”

Section: European Approachesmentioning

confidence: 99%

Fire Resistance Design of Unprotected Concrete Filled Steel Hollow Sections: Meta-Analysis of Available Furnace Test Data

Rush¹,

Bisby²,

Melandinos³

et al. 2011

Fire Safety Science - Proceedings of the 10th International Sym

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Concrete filled steel hollow structural sections are an efficient, sustainable, and attractive option for both ambient temperature and fire resistance design of columns in multi-storey buildings and are increasingly common in modern construction practice around the world. Whilst the design of these sections at ambient temperatures is reasonably well understood, and models to predict the strength and failure modes of these elements correlate well with observations from tests, this appears not to be true in the case of fire resistant design. This paper assesses the statistical confidence in available fire resistance design models/approaches that are used in North America and Europe by performing a meta-analysis which compares the available experimental data from large-scale standard fire tests performed around the world against fire resistance predictions from design codes. It is shown that available design approaches carry a large uncertainty of prediction, suggesting that they fail to properly account for fundamental aspects of the underlying mechanics during fire. Current North American design approaches for CFS columns are shown to be considerably less conservative, on average, than those used in Europe.

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Realistic modelling of thermal and structural behaviour of unprotected concrete filled tubular columns in fire

Cited by 144 publications

References 7 publications

Temperature field of concrete-filled steel tubular columns in fire

Temperature field of concrete-filled steel tubular columns in fire

A Numerical Study on the Effect of Concrete Infill and Intumescent Coating to Fire-Resistant Behaviour of Stub Elliptical Steel Hollow Sections Under Axial Compression

Fire Resistance Design of Unprotected Concrete Filled Steel Hollow Sections: Meta-Analysis of Available Furnace Test Data

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