Effect of Air-Gap on Performance of Fabricated Slim Floor Beams in Fire

Naveed Alam, A Nadjai, Chrysanthos Maraveas, K. D Tsavdaridis, FA Ali

Research output: Contribution to conferencePaper

Abstract

Fabricated slim floor beams are produced by welding a steel plate to the bottom flange of an I-shaped steel section. The welded steel plate makes them structurally efficient and serves as a platform to support the steel decking of composite floor and the pre-cast concrete slabs. During their fabrication, an air-gap is induced between the steel plate and the bottom flange. Previous experimental investigations have shown that this air-gap has an influence on their thermal behaviour at elevated temperatures. Though the air-gap presence has an influence on their thermal performance, no investigations have yet been conducted to analyse its effects on their structural response in fire. This research investigates the effects of air-gap on structural response of fabricated slim floor beams in fire. During this study, finite element modelling is performed to simulate the response of fabricated slim floor beams and the predicted behaviour is verified against the available test data from literature. The validated finite element model is then employed to perform parametric studies to investigate the effects of the presence and size of the air-gap on their response in fire. Results obtained show that the presence of the air-gap has a significant influence on structural response of these beams at elevated temperatures. On the other hand, the size of air-gap has no or negligible effect on their thermal behaviour as well as on their structural response in fire. It was found that the presence of the air-gap restricts temperatures on the bottom flange and helps in achieving an improved fire resistance. As the presence of the air-gap is found to be helpful and beneficial, findings from this research can be used to develop similar designs for structural members as an efficient and inexpensive way to improve their behaviour in fire.

Conference

ConferenceNinth International Conference on Advances in Steel Structures
Abbreviated titleICASS 2018
CountryChina
CityHong Kong
Period5/12/187/12/18
Internet address

Fingerprint

Fires
Air
Flanges
Steel
Fire resistance
Precast concrete
Structural members
Concrete slabs
Temperature
Welding
Fabrication
Composite materials
Hot Temperature

Keywords

  • Slim Floor Beams
  • Fire Resistance
  • Air-gap effect
  • Finite Element Modelling
  • composite construction

Cite this

Alam, N., Nadjai, A., Maraveas, C., Tsavdaridis, K. D., & Ali, FA. (2018). Effect of Air-Gap on Performance of Fabricated Slim Floor Beams in Fire. Paper presented at Ninth International Conference on Advances in Steel Structures , Hong Kong, China. https://doi.org/10.18057/ICASS2018.P.043
Alam, Naveed ; Nadjai, A ; Maraveas, Chrysanthos ; Tsavdaridis, K. D ; Ali, FA. / Effect of Air-Gap on Performance of Fabricated Slim Floor Beams in Fire. Paper presented at Ninth International Conference on Advances in Steel Structures , Hong Kong, China.11 p.
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keywords = "Slim Floor Beams, Fire Resistance, Air-gap effect, Finite Element Modelling, composite construction",
author = "Naveed Alam and A Nadjai and Chrysanthos Maraveas and Tsavdaridis, {K. D} and FA Ali",
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Alam, N, Nadjai, A, Maraveas, C, Tsavdaridis, KD & Ali, FA 2018, 'Effect of Air-Gap on Performance of Fabricated Slim Floor Beams in Fire' Paper presented at Ninth International Conference on Advances in Steel Structures , Hong Kong, China, 5/12/18 - 7/12/18, . https://doi.org/10.18057/ICASS2018.P.043

Effect of Air-Gap on Performance of Fabricated Slim Floor Beams in Fire. / Alam, Naveed; Nadjai, A; Maraveas, Chrysanthos; Tsavdaridis, K. D; Ali, FA.

2018. Paper presented at Ninth International Conference on Advances in Steel Structures , Hong Kong, China.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Effect of Air-Gap on Performance of Fabricated Slim Floor Beams in Fire

AU - Alam, Naveed

AU - Nadjai, A

AU - Maraveas, Chrysanthos

AU - Tsavdaridis, K. D

AU - Ali, FA

PY - 2018/12/5

Y1 - 2018/12/5

N2 - Fabricated slim floor beams are produced by welding a steel plate to the bottom flange of an I-shaped steel section. The welded steel plate makes them structurally efficient and serves as a platform to support the steel decking of composite floor and the pre-cast concrete slabs. During their fabrication, an air-gap is induced between the steel plate and the bottom flange. Previous experimental investigations have shown that this air-gap has an influence on their thermal behaviour at elevated temperatures. Though the air-gap presence has an influence on their thermal performance, no investigations have yet been conducted to analyse its effects on their structural response in fire. This research investigates the effects of air-gap on structural response of fabricated slim floor beams in fire. During this study, finite element modelling is performed to simulate the response of fabricated slim floor beams and the predicted behaviour is verified against the available test data from literature. The validated finite element model is then employed to perform parametric studies to investigate the effects of the presence and size of the air-gap on their response in fire. Results obtained show that the presence of the air-gap has a significant influence on structural response of these beams at elevated temperatures. On the other hand, the size of air-gap has no or negligible effect on their thermal behaviour as well as on their structural response in fire. It was found that the presence of the air-gap restricts temperatures on the bottom flange and helps in achieving an improved fire resistance. As the presence of the air-gap is found to be helpful and beneficial, findings from this research can be used to develop similar designs for structural members as an efficient and inexpensive way to improve their behaviour in fire.

AB - Fabricated slim floor beams are produced by welding a steel plate to the bottom flange of an I-shaped steel section. The welded steel plate makes them structurally efficient and serves as a platform to support the steel decking of composite floor and the pre-cast concrete slabs. During their fabrication, an air-gap is induced between the steel plate and the bottom flange. Previous experimental investigations have shown that this air-gap has an influence on their thermal behaviour at elevated temperatures. Though the air-gap presence has an influence on their thermal performance, no investigations have yet been conducted to analyse its effects on their structural response in fire. This research investigates the effects of air-gap on structural response of fabricated slim floor beams in fire. During this study, finite element modelling is performed to simulate the response of fabricated slim floor beams and the predicted behaviour is verified against the available test data from literature. The validated finite element model is then employed to perform parametric studies to investigate the effects of the presence and size of the air-gap on their response in fire. Results obtained show that the presence of the air-gap has a significant influence on structural response of these beams at elevated temperatures. On the other hand, the size of air-gap has no or negligible effect on their thermal behaviour as well as on their structural response in fire. It was found that the presence of the air-gap restricts temperatures on the bottom flange and helps in achieving an improved fire resistance. As the presence of the air-gap is found to be helpful and beneficial, findings from this research can be used to develop similar designs for structural members as an efficient and inexpensive way to improve their behaviour in fire.

KW - Slim Floor Beams

KW - Fire Resistance

KW - Air-gap effect

KW - Finite Element Modelling

KW - composite construction

UR - http://www.icass2018.com/

U2 - 10.18057/ICASS2018.P.043

DO - 10.18057/ICASS2018.P.043

M3 - Paper

ER -

Alam N, Nadjai A, Maraveas C, Tsavdaridis KD, Ali FA. Effect of Air-Gap on Performance of Fabricated Slim Floor Beams in Fire. 2018. Paper presented at Ninth International Conference on Advances in Steel Structures , Hong Kong, China. https://doi.org/10.18057/ICASS2018.P.043