Experimental and Analytical Investigations on Thermal Performance of Slim Floor Beams with Web Openings in Fire

Naveed Alam, A Nadjai, FA Ali, Olivier Vassart, Francois Hanus

Research output: Contribution to conferencePaper

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Abstract

Steel beams with web openings are widely used in constructions to reduce the weight of steelwork, especially in structures comprising of traditional composite beams with down-stand steel sections. In recent times, the use of steel sections with web openings has become common as slim floor beams since they offer a reduction in weight of the steelwork, accommodate services within the floor depth and provide the plug composite action. Though these web openings offer several benefits in slim floor beams, however, they induce the material discontinuity in the web affecting their shear capacity and thermal behaviour. During the pouring of concrete, the steel in the web openings is replaced by the concrete with a low thermal conductivity. This research presents findings from experimental and analytical investigations conducted to study the thermal behaviour of slim floor beams with web openings in fire. For this purpose, an experimental investigation was conducted to study the thermal response of slim floor beams in fire. Data obtained from the fire test shows that the presence of web openings has a significant influence on temperature development across the steel section as well as along the span of these beams. The temperatures on the web below the openings are higher in comparison to those on the adjacent web-posts. It is also observed that temperatures on the web above the openings are significantly lesser than those on the adjacent web-posts. Parametric studies conducted using the finite element modelling show that smaller opening spacings and larger opening sizes have a severe influence on the thermal behaviour of these beams in fire. The findings of this research will help in selecting appropriate opening sizes and spacings in slim floor beams to avoid any severe temperature distributions in fire and to ensure their suitable utility.
Original languageEnglish
Pages473-480
Number of pages8
Publication statusPublished - 6 Jun 2018
Event10th International Conference on Structures in Fire - Titanic, Belfast, United Kingdom
Duration: 6 Jun 20188 Jun 2018
https://www.ulster.ac.uk/conference/structures-in-fire-2018

Conference

Conference10th International Conference on Structures in Fire
CountryUnited Kingdom
CityBelfast
Period6/06/188/06/18
Internet address

Fingerprint

Fires
Steel
Concretes
Composite materials
Temperature
Hot Temperature
Thermal conductivity
Temperature distribution

Keywords

  • Slim Floor Beams
  • Web openings
  • thermal response
  • fire tests
  • Finite Element Modelling

Cite this

Alam, N., Nadjai, A., Ali, FA., Vassart, O., & Hanus, F. (2018). Experimental and Analytical Investigations on Thermal Performance of Slim Floor Beams with Web Openings in Fire. 473-480. Paper presented at 10th International Conference on Structures in Fire, Belfast, United Kingdom.
Alam, Naveed ; Nadjai, A ; Ali, FA ; Vassart, Olivier ; Hanus, Francois. / Experimental and Analytical Investigations on Thermal Performance of Slim Floor Beams with Web Openings in Fire. Paper presented at 10th International Conference on Structures in Fire, Belfast, United Kingdom.8 p.
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abstract = "Steel beams with web openings are widely used in constructions to reduce the weight of steelwork, especially in structures comprising of traditional composite beams with down-stand steel sections. In recent times, the use of steel sections with web openings has become common as slim floor beams since they offer a reduction in weight of the steelwork, accommodate services within the floor depth and provide the plug composite action. Though these web openings offer several benefits in slim floor beams, however, they induce the material discontinuity in the web affecting their shear capacity and thermal behaviour. During the pouring of concrete, the steel in the web openings is replaced by the concrete with a low thermal conductivity. This research presents findings from experimental and analytical investigations conducted to study the thermal behaviour of slim floor beams with web openings in fire. For this purpose, an experimental investigation was conducted to study the thermal response of slim floor beams in fire. Data obtained from the fire test shows that the presence of web openings has a significant influence on temperature development across the steel section as well as along the span of these beams. The temperatures on the web below the openings are higher in comparison to those on the adjacent web-posts. It is also observed that temperatures on the web above the openings are significantly lesser than those on the adjacent web-posts. Parametric studies conducted using the finite element modelling show that smaller opening spacings and larger opening sizes have a severe influence on the thermal behaviour of these beams in fire. The findings of this research will help in selecting appropriate opening sizes and spacings in slim floor beams to avoid any severe temperature distributions in fire and to ensure their suitable utility.",
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Alam, N, Nadjai, A, Ali, FA, Vassart, O & Hanus, F 2018, 'Experimental and Analytical Investigations on Thermal Performance of Slim Floor Beams with Web Openings in Fire', Paper presented at 10th International Conference on Structures in Fire, Belfast, United Kingdom, 6/06/18 - 8/06/18 pp. 473-480.

Experimental and Analytical Investigations on Thermal Performance of Slim Floor Beams with Web Openings in Fire. / Alam, Naveed; Nadjai, A; Ali, FA; Vassart, Olivier; Hanus, Francois.

2018. 473-480 Paper presented at 10th International Conference on Structures in Fire, Belfast, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Experimental and Analytical Investigations on Thermal Performance of Slim Floor Beams with Web Openings in Fire

AU - Alam, Naveed

AU - Nadjai, A

AU - Ali, FA

AU - Vassart, Olivier

AU - Hanus, Francois

PY - 2018/6/6

Y1 - 2018/6/6

N2 - Steel beams with web openings are widely used in constructions to reduce the weight of steelwork, especially in structures comprising of traditional composite beams with down-stand steel sections. In recent times, the use of steel sections with web openings has become common as slim floor beams since they offer a reduction in weight of the steelwork, accommodate services within the floor depth and provide the plug composite action. Though these web openings offer several benefits in slim floor beams, however, they induce the material discontinuity in the web affecting their shear capacity and thermal behaviour. During the pouring of concrete, the steel in the web openings is replaced by the concrete with a low thermal conductivity. This research presents findings from experimental and analytical investigations conducted to study the thermal behaviour of slim floor beams with web openings in fire. For this purpose, an experimental investigation was conducted to study the thermal response of slim floor beams in fire. Data obtained from the fire test shows that the presence of web openings has a significant influence on temperature development across the steel section as well as along the span of these beams. The temperatures on the web below the openings are higher in comparison to those on the adjacent web-posts. It is also observed that temperatures on the web above the openings are significantly lesser than those on the adjacent web-posts. Parametric studies conducted using the finite element modelling show that smaller opening spacings and larger opening sizes have a severe influence on the thermal behaviour of these beams in fire. The findings of this research will help in selecting appropriate opening sizes and spacings in slim floor beams to avoid any severe temperature distributions in fire and to ensure their suitable utility.

AB - Steel beams with web openings are widely used in constructions to reduce the weight of steelwork, especially in structures comprising of traditional composite beams with down-stand steel sections. In recent times, the use of steel sections with web openings has become common as slim floor beams since they offer a reduction in weight of the steelwork, accommodate services within the floor depth and provide the plug composite action. Though these web openings offer several benefits in slim floor beams, however, they induce the material discontinuity in the web affecting their shear capacity and thermal behaviour. During the pouring of concrete, the steel in the web openings is replaced by the concrete with a low thermal conductivity. This research presents findings from experimental and analytical investigations conducted to study the thermal behaviour of slim floor beams with web openings in fire. For this purpose, an experimental investigation was conducted to study the thermal response of slim floor beams in fire. Data obtained from the fire test shows that the presence of web openings has a significant influence on temperature development across the steel section as well as along the span of these beams. The temperatures on the web below the openings are higher in comparison to those on the adjacent web-posts. It is also observed that temperatures on the web above the openings are significantly lesser than those on the adjacent web-posts. Parametric studies conducted using the finite element modelling show that smaller opening spacings and larger opening sizes have a severe influence on the thermal behaviour of these beams in fire. The findings of this research will help in selecting appropriate opening sizes and spacings in slim floor beams to avoid any severe temperature distributions in fire and to ensure their suitable utility.

KW - Slim Floor Beams

KW - Web openings

KW - thermal response

KW - fire tests

KW - Finite Element Modelling

UR - https://www.ulster.ac.uk/conference/structures-in-fire-2018

M3 - Paper

SP - 473

EP - 480

ER -

Alam N, Nadjai A, Ali FA, Vassart O, Hanus F. Experimental and Analytical Investigations on Thermal Performance of Slim Floor Beams with Web Openings in Fire. 2018. Paper presented at 10th International Conference on Structures in Fire, Belfast, United Kingdom.