Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan

Cellular steel beams (CSB) is widely used in European country, especially in the United Kingdom (UK) and many other country in recent years. There is a need to introduce these types of beam structure in Malaysian construction industries due to its advantages compared to conventional beam structures....

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Main Author:	Ahmad Zakwan, Fariz Aswan
Format:	Thesis
Language:	English
Published:	2019
Subjects:	Structural engineering
Online Access:	https://ir.uitm.edu.my/id/eprint/31387/2/31387.pdf
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spelling	my-uitm-ir.313872024-04-15T04:37:24Z Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan 2019 Ahmad Zakwan, Fariz Aswan Structural engineering Cellular steel beams (CSB) is widely used in European country, especially in the United Kingdom (UK) and many other country in recent years. There is a need to introduce these types of beam structure in Malaysian construction industries due to its advantages compared to conventional beam structures. These advantages include appealing design, structural strength effectiveness and permits serviceability pipes to go through the main web section of the CSB. Additional concrete slab attached on top of the CSB increases its strength as load bearing element against external loading action onto the beam. Even though the interaction between the concrete slab and CSB to create a strong structural member, the beam strength and stiffness is slowly deteriorated when expose to fire exposure and external applied loading action. CSB is highly exposed to fire if the fire hazard does occur in any compartment in buildings. It is very crucial to evaluate the structural performance behaviour of the composite CSB under applied loading at elevated temperature. Several failure modes were triggered due to this scenario, namely vertical deflection, web-post buckling and Vierendeel bending failure. In this research, numerical models were developed by using general purpose of ABAQUS finite element program to predict the failure modes and temperature evolution along the CSB section at elevated temperature. From the outcome of numerical simulations, it was found that the FE models were tremendously sensitive when applying the applied vertical loading and boundary conditions onto the CSB. Parametric investigation was conducted into various factors that contribute to the failure modes of CSB at elevated temperature. These important factors include applying fire protection material, different geometrical section of the beam and the size of the web opening of beam. Applying fire protection material of intumescent coating does reducing the temperature evolution along the beam section. Therefore, in this current study, temperature distribution, vertical displacement, web-post buckling and Viereendeel bending failure were measured and predicted for the CSB at elevated temperature. The temperature distribution along the beam section were significantly reduced when applying intumescent coating surrounding the beam. It is was observed that between 20% to 30% temperature reduction were obtained for applied intumescent coating thickness between 0.5 mm to 1.5 mm. However, vertical displacement does not have a significant effect when applying intumescent coating even though the displacement there were slightly decreasing. In addition, the web-post buckling were slightly decreased (approximately between 0% to 10%) when adopting fire protection material under applied vertical loading action. In terms of Vierendeel bending failure mechanism, the CSB were able to sustain higher loads through Von Mises stress distribution (approximately between 0% to 10% stress increase) along the beam section. Similar behaviour when adopting intumescent coating thickness between 0.3 mm to 1.5 mm were obtained in terms of higher maximum stress and fracture stress. Longer period of fire exposure can be predicted before the beam fails due to these extreme conditions. From the results of this research, a new 'Addendum' can be produced and can be included together with current steel beam design guidelines (Malaysian Standards-MS). Engineers will be benefited from this new iteration design guidelines to be added in designing steel buildings by considering fire exposure apart from traditionally design procedures. 2019 Thesis https://ir.uitm.edu.my/id/eprint/31387/ https://ir.uitm.edu.my/id/eprint/31387/2/31387.pdf text en public phd doctoral Universiti Teknologi MARA (UiTM) Faculty of Civil Engineering Krishnamoorthy, Renga Rao
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Krishnamoorthy, Renga Rao
topic	Structural engineering
spellingShingle	Structural engineering Ahmad Zakwan, Fariz Aswan Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan
description	Cellular steel beams (CSB) is widely used in European country, especially in the United Kingdom (UK) and many other country in recent years. There is a need to introduce these types of beam structure in Malaysian construction industries due to its advantages compared to conventional beam structures. These advantages include appealing design, structural strength effectiveness and permits serviceability pipes to go through the main web section of the CSB. Additional concrete slab attached on top of the CSB increases its strength as load bearing element against external loading action onto the beam. Even though the interaction between the concrete slab and CSB to create a strong structural member, the beam strength and stiffness is slowly deteriorated when expose to fire exposure and external applied loading action. CSB is highly exposed to fire if the fire hazard does occur in any compartment in buildings. It is very crucial to evaluate the structural performance behaviour of the composite CSB under applied loading at elevated temperature. Several failure modes were triggered due to this scenario, namely vertical deflection, web-post buckling and Vierendeel bending failure. In this research, numerical models were developed by using general purpose of ABAQUS finite element program to predict the failure modes and temperature evolution along the CSB section at elevated temperature. From the outcome of numerical simulations, it was found that the FE models were tremendously sensitive when applying the applied vertical loading and boundary conditions onto the CSB. Parametric investigation was conducted into various factors that contribute to the failure modes of CSB at elevated temperature. These important factors include applying fire protection material, different geometrical section of the beam and the size of the web opening of beam. Applying fire protection material of intumescent coating does reducing the temperature evolution along the beam section. Therefore, in this current study, temperature distribution, vertical displacement, web-post buckling and Viereendeel bending failure were measured and predicted for the CSB at elevated temperature. The temperature distribution along the beam section were significantly reduced when applying intumescent coating surrounding the beam. It is was observed that between 20% to 30% temperature reduction were obtained for applied intumescent coating thickness between 0.5 mm to 1.5 mm. However, vertical displacement does not have a significant effect when applying intumescent coating even though the displacement there were slightly decreasing. In addition, the web-post buckling were slightly decreased (approximately between 0% to 10%) when adopting fire protection material under applied vertical loading action. In terms of Vierendeel bending failure mechanism, the CSB were able to sustain higher loads through Von Mises stress distribution (approximately between 0% to 10% stress increase) along the beam section. Similar behaviour when adopting intumescent coating thickness between 0.3 mm to 1.5 mm were obtained in terms of higher maximum stress and fracture stress. Longer period of fire exposure can be predicted before the beam fails due to these extreme conditions. From the results of this research, a new 'Addendum' can be produced and can be included together with current steel beam design guidelines (Malaysian Standards-MS). Engineers will be benefited from this new iteration design guidelines to be added in designing steel buildings by considering fire exposure apart from traditionally design procedures.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ahmad Zakwan, Fariz Aswan
author_facet	Ahmad Zakwan, Fariz Aswan
author_sort	Ahmad Zakwan, Fariz Aswan
title	Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan
title_short	Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan
title_full	Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan
title_fullStr	Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan
title_full_unstemmed	Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan
title_sort	numerical analysis of protected and unprotected cellular steel beams (csb) at elevated temperature / fariz aswan ahmad zakwan
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Civil Engineering
publishDate	2019
url	https://ir.uitm.edu.my/id/eprint/31387/2/31387.pdf
_version_	1804889625482756096

Numerical analysis of protected and unprotected cellular steel beams (CSB) at elevated temperature / Fariz Aswan Ahmad Zakwan

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