Evaluation of fire resistance of rectangular steel columns filled with fibre-reinforced concrete

The strength of hollow circular steel sections filled with normal-strength plain concrete and fibre-reinforced concrete (FRC) was evaluated. First, the case of centrally loaded composite members was considered and the bearing capacity of the columns was calculated using the methods proposed by a European code (EC4) and an American code (LRDF). Some expressions in these codes were validated for the case of FRC by adapting experimental data to introduce the mechanical properties of the FRC. To do this, experimental results of standard tests on FRC (compression and splitting tension) were used as well as data on circular steel columns filled with 2% FRC by volume with different types of fibres (steel, polyolefin). Second, the moment - axial force diagrams for composite members, taking into account the residual tensile strength of FRC, were calculated, showing the advantages of using FRC compared with plain concrete for filling hollow steel sections.Key words: fibre-reinforced concrete, hollow steel columns, composite members, steel fibres, polyolefin fibres.

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Thermal and mechanical properties of steel-fibre-reinforced concrete at elevated temperatures

Canadian Journal of Civil Engineering ◽

10.1139/l96-055 ◽

1996 ◽

Vol 23 (2) ◽

pp. 511-517 ◽

Cited By ~ 75

Author(s):

T. T. Lie ◽

V. K. R. Kodur

Keyword(s):

Mechanical Properties ◽

Thermal Properties ◽

Reinforced Concrete ◽

Fire Resistance ◽

Elevated Temperatures ◽

Steel Fibre ◽

Fibre Reinforced Concrete ◽

Thermal And Mechanical Properties ◽

Steel Fibre Reinforced Concrete ◽

Deformation Properties

For use in fire resistance calculations, the relevant thermal and mechanical properties of steel-fibre-reinforced concrete at elevated temperatures were determined. These properties included the thermal conductivity, specific heat, thermal expansion, and mass loss, as well as the strength and deformation properties of steel-fibre-reinforced siliceous and carbonate aggregate concretes. The thermal properties are presented in equations that express the values of these properties as a function of temperature in the temperature range between 0 °C and 1000 °C. The mechanical properties are given in the form of stress–strain relationships for the concretes at elevated temperatures. The results indicate that the steel fibres have little influence on the thermal properties of the concretes. The influence on the mechanical properties, however, is relatively greater than the influence on the thermal properties and is expected to be beneficial to the fire resistance of structural elements constructed of fibre-reinforced concrete. Key words: steel fibre, reinforced concrete, thermal properties, mechanical properties, fire resistance.

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Experimental behaviour of eccentrically loaded slender circular hollow steel columns in-filled with fibre reinforced concrete

Journal of Constructional Steel Research ◽

10.1016/j.jcsr.2005.09.004 ◽

2006 ◽

Vol 62 (5) ◽

pp. 513-520 ◽

Cited By ~ 32

Author(s):

S. Ramana Gopal ◽

P. Devadas Manoharan

Keyword(s):

Reinforced Concrete ◽

Fibre Reinforced Concrete ◽

Steel Columns ◽

Experimental Behaviour

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

Journal of Structural Engineering ◽

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

1994 ◽

Vol 120 (5) ◽

pp. 1489-1509 ◽

Cited By ~ 141

Author(s):

T. T. Lie

Keyword(s):

Reinforced Concrete ◽

Fire Resistance ◽

Steel Columns

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Fibre Cocktail to Improve Fire Resistance

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.711.480 ◽

2016 ◽

Vol 711 ◽

pp. 480-487

Author(s):

György L. Balázs ◽

Olivér Czoboly

Keyword(s):

Experimental Study ◽

Reinforced Concrete ◽

Flexural Strength ◽

High Temperatures ◽

Fire Resistance ◽

Fibre Reinforced Concrete ◽

Cellulose Fibres ◽

Cold State

Favourable experience with fibre reinforced concrete (FRC) resulted in its increasing use worldwide. The properties of fibre reinforced concrete are mostly influenced by the type and the amount of fibres. Our experimental study was directed to the possible improvements of the residual flexural strength and the properties of concrete exposed to high temperatures with different fibre cocktails including steel, micro polymer or cellulose fibres. The influence of type and amount of fibres on residual flexural strength in cold state were tested after 300, 500 or 800 °C temperature loading.

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