Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon

The connection plays a vital role in assembling the timber members to maintain stability and strength in the timber structure. The large deformation concept is adopted in the timber connection design to allow ductility failure instead of timber brittle failure, thus providing a higher lateral load-c...

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Main Author:	Shakimon, Mohd Nizam
Format:	Thesis
Language:	English
Published:	2022
Subjects:	Timber Wood
Online Access:	https://ir.uitm.edu.my/id/eprint/66956/1/66956.pdf
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id	my-uitm-ir.66956
record_format	uketd_dc
spelling	my-uitm-ir.669562022-09-19T09:03:48Z Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon 2022 Shakimon, Mohd Nizam Timber. Wood Dynamic loading conditions. Structural dynamics. Vibrations The connection plays a vital role in assembling the timber members to maintain stability and strength in the timber structure. The large deformation concept is adopted in the timber connection design to allow ductility failure instead of timber brittle failure, thus providing a higher lateral load-carrying capacity and structural stability. Since timber is a combustible material, the design of timber connections becomes more crucial to prevent premature failure due to fire loading. Additional designs for fire requirements are specified. Currently, European Yield Model (EYM) design theory is widely adopted to design timber connections at normal temperature and for fire requirements. However, the Malaysian Design Code for Timber (MS544) still lacks extensive specifications for determining the performance of tropical timber connections in a fire event. Therefore, this research aims to provide insight into the structural timber connections after exposure to a fire event for further study and reference. It specifically studies the structural performance of the slotted-in steel plate bolted connection in the engineered wood product (EWP) glued-laminated (glulam) timber beam after exposure to a standard fire. A modification to the extensive EYM theoretical model specified in Eurocode (EC) 5 for the fire is proposed to suit Malaysian tropical timber. It involved experimental tests under four-point bending and tensile loads for eighteen (18) glulam Mengkulang timber beams samples in 130mm x 150mm x 1400mm geometry specifications connected with slotted-in steel plate and bolts 12mm, 16mm, and 20mm diameters. The Mengkulang glulam timber beams samples were divided into groups 1 and 2. Group 1 consisted of eleven (11) samples tested in tensile, with nine (9) were performed at normal temperature, and two (2) were performed in a standard fire. The tensile test at normal temperature was performed until rupture to determine the samples ultimate load-carrying capacity. The tensile test in the standard fire was performed in a fire furnace by positioning the samples vertically, supported at the top end, and the bottom end was subjected to a static tensile load of 40% ultimate load-carrying capacity at normal temperature. The samples were exposed to fire, and the temperature was controlled to follow the standard fire curve specified in BS476-22. Group 2 consisted of seven (7) glulam timber beams tested in bending at normal temperature, with three (3) were tested after exposure to a 30-minute standard fire and cooled down to normal temperature. The results were further used to validate the computer simulation using the finite element method (FEM) for parametric study. After exposure to the standard fire, the experimental results showed the load-carrying capacity of the Mengkulang glulam timber beams under the four-point bending test reduced by 71.8%, 26.1%, and 47.6% for bolt diameters of 12mm, 16mm, and 20mm, respectively. Further investigations show that the glulam timber beams samples before exposure to the standard fire reached ductility failures. However, after exposure to the standard fire, the experimental results show the brittle failure in timber. A linear fitting was established to modify the EYM specified in Eurocode 5 to determine the load-carrying capacity of glulam Mengkulang timber bolted connection after exposure to the standard fire, thus proposing the equation for decay constant. 2022 Thesis https://ir.uitm.edu.my/id/eprint/66956/ https://ir.uitm.edu.my/id/eprint/66956/1/66956.pdf text en public phd doctoral Universiti Teknologi MARA (UiTM) College of Engineering Hassan, Rohana
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Hassan, Rohana
topic	Timber Wood Timber Wood
spellingShingle	Timber Wood Timber Wood Shakimon, Mohd Nizam Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon
description	The connection plays a vital role in assembling the timber members to maintain stability and strength in the timber structure. The large deformation concept is adopted in the timber connection design to allow ductility failure instead of timber brittle failure, thus providing a higher lateral load-carrying capacity and structural stability. Since timber is a combustible material, the design of timber connections becomes more crucial to prevent premature failure due to fire loading. Additional designs for fire requirements are specified. Currently, European Yield Model (EYM) design theory is widely adopted to design timber connections at normal temperature and for fire requirements. However, the Malaysian Design Code for Timber (MS544) still lacks extensive specifications for determining the performance of tropical timber connections in a fire event. Therefore, this research aims to provide insight into the structural timber connections after exposure to a fire event for further study and reference. It specifically studies the structural performance of the slotted-in steel plate bolted connection in the engineered wood product (EWP) glued-laminated (glulam) timber beam after exposure to a standard fire. A modification to the extensive EYM theoretical model specified in Eurocode (EC) 5 for the fire is proposed to suit Malaysian tropical timber. It involved experimental tests under four-point bending and tensile loads for eighteen (18) glulam Mengkulang timber beams samples in 130mm x 150mm x 1400mm geometry specifications connected with slotted-in steel plate and bolts 12mm, 16mm, and 20mm diameters. The Mengkulang glulam timber beams samples were divided into groups 1 and 2. Group 1 consisted of eleven (11) samples tested in tensile, with nine (9) were performed at normal temperature, and two (2) were performed in a standard fire. The tensile test at normal temperature was performed until rupture to determine the samples ultimate load-carrying capacity. The tensile test in the standard fire was performed in a fire furnace by positioning the samples vertically, supported at the top end, and the bottom end was subjected to a static tensile load of 40% ultimate load-carrying capacity at normal temperature. The samples were exposed to fire, and the temperature was controlled to follow the standard fire curve specified in BS476-22. Group 2 consisted of seven (7) glulam timber beams tested in bending at normal temperature, with three (3) were tested after exposure to a 30-minute standard fire and cooled down to normal temperature. The results were further used to validate the computer simulation using the finite element method (FEM) for parametric study. After exposure to the standard fire, the experimental results showed the load-carrying capacity of the Mengkulang glulam timber beams under the four-point bending test reduced by 71.8%, 26.1%, and 47.6% for bolt diameters of 12mm, 16mm, and 20mm, respectively. Further investigations show that the glulam timber beams samples before exposure to the standard fire reached ductility failures. However, after exposure to the standard fire, the experimental results show the brittle failure in timber. A linear fitting was established to modify the EYM specified in Eurocode 5 to determine the load-carrying capacity of glulam Mengkulang timber bolted connection after exposure to the standard fire, thus proposing the equation for decay constant.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Shakimon, Mohd Nizam
author_facet	Shakimon, Mohd Nizam
author_sort	Shakimon, Mohd Nizam
title	Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon
title_short	Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon
title_full	Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon
title_fullStr	Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon
title_full_unstemmed	Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon
title_sort	structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / mohd nizam shakimon
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	College of Engineering
publishDate	2022
url	https://ir.uitm.edu.my/id/eprint/66956/1/66956.pdf
_version_	1783735651659677696

Structural performance of glulam mengkulang timber beam with slotted-in steel plate bolted connection / Mohd Nizam Shakimon

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