Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws

The application of cold-formed steel (CFS) on roof structures has become popular in construction practices in Malaysia. Generally, CFS structure joints use self-drilling screws (SdS) for easy and fast installation purpose. However, a premature collapse of a CFS structure may occur due to connection...

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Main Author:	Bong, Rackford
Format:	Thesis
Language:	English
Published:	2021
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/98226/1/RackfordBongPSKA2021.pdf
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id	my-utm-ep.98226
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spelling	my-utm-ep.982262022-11-23T07:55:53Z Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws 2021 Bong, Rackford TA Engineering (General). Civil engineering (General) The application of cold-formed steel (CFS) on roof structures has become popular in construction practices in Malaysia. Generally, CFS structure joints use self-drilling screws (SdS) for easy and fast installation purpose. However, a premature collapse of a CFS structure may occur due to connection failure. Therefore, in order to avoid and better prepare for such an eventuality, a study to overcome the failure of the connection on CFS structures is needed. Research suggests that a combined joint (connection) between SdS and adhesive (Hybrid connection) on CFS structures could prevent premature collapse. Informed by past and current research developments, this study therefore investigated the behaviour and failure modes of CFS connections with three different types of connection methods; adhesive, SdS and hybrid connection. Shear test was conducted to determine the ultimate failure load, where the connection failed as a result of direct shear acting on it. The effect of adhesive thickness, number of screws, bonded area, plate thickness and screw arrangement on connection strength was also studied and reviewed through experiment and statistical analyses using Pearson Correlation. The results demonstrated the existence of statistically significant correlation between the bonded area and bonding strength for C-section of CFS. Specifically, an increase in the bonded area provides an increase in bonding strength. In this study it is also found that with an increase of screw quantities and plate thickness, the connection strength increased. Comparisons on the connection strength between adhesive, SdS and hybrid connections was carried out and statistical analysis using ANOVA test prove that the strength of hybrid connections is statistically significantly higher compared to adhesive connection and SdS connection. It was found that hybrid connection specimen utilising 0.5mm adhesive thickness, 4 screws connection, with a web depth of 100mm, plate thickness of 1.20mm and lapping length of 80mm, has the highest connection strength, specifically at 66% higher than adhesive connection, and 46% higher than SdS connection. Based on the regression analysis, this research proposed an empirical formula to calculate the hybrid connection strength. A comparison of hybrid connection strength between the experimental result and predicted connection strength (proposed empirical formula) was conducted and generally the predicted connection strength is in accordance with the experimental result. Therefore, the proposed empirical formula is considered ideal for calculating the connection strength of the hybrid connection limited to plate thickness range 0.75mm – 1.20mm. 2021 Thesis http://eprints.utm.my/id/eprint/98226/ http://eprints.utm.my/id/eprint/98226/1/RackfordBongPSKA2021.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:144894 phd doctoral Universiti Teknologi Malaysia, Faculty of Engineering - School of Civil Engineering Faculty of Engineering - School of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Bong, Rackford Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws
description	The application of cold-formed steel (CFS) on roof structures has become popular in construction practices in Malaysia. Generally, CFS structure joints use self-drilling screws (SdS) for easy and fast installation purpose. However, a premature collapse of a CFS structure may occur due to connection failure. Therefore, in order to avoid and better prepare for such an eventuality, a study to overcome the failure of the connection on CFS structures is needed. Research suggests that a combined joint (connection) between SdS and adhesive (Hybrid connection) on CFS structures could prevent premature collapse. Informed by past and current research developments, this study therefore investigated the behaviour and failure modes of CFS connections with three different types of connection methods; adhesive, SdS and hybrid connection. Shear test was conducted to determine the ultimate failure load, where the connection failed as a result of direct shear acting on it. The effect of adhesive thickness, number of screws, bonded area, plate thickness and screw arrangement on connection strength was also studied and reviewed through experiment and statistical analyses using Pearson Correlation. The results demonstrated the existence of statistically significant correlation between the bonded area and bonding strength for C-section of CFS. Specifically, an increase in the bonded area provides an increase in bonding strength. In this study it is also found that with an increase of screw quantities and plate thickness, the connection strength increased. Comparisons on the connection strength between adhesive, SdS and hybrid connections was carried out and statistical analysis using ANOVA test prove that the strength of hybrid connections is statistically significantly higher compared to adhesive connection and SdS connection. It was found that hybrid connection specimen utilising 0.5mm adhesive thickness, 4 screws connection, with a web depth of 100mm, plate thickness of 1.20mm and lapping length of 80mm, has the highest connection strength, specifically at 66% higher than adhesive connection, and 46% higher than SdS connection. Based on the regression analysis, this research proposed an empirical formula to calculate the hybrid connection strength. A comparison of hybrid connection strength between the experimental result and predicted connection strength (proposed empirical formula) was conducted and generally the predicted connection strength is in accordance with the experimental result. Therefore, the proposed empirical formula is considered ideal for calculating the connection strength of the hybrid connection limited to plate thickness range 0.75mm – 1.20mm.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Bong, Rackford
author_facet	Bong, Rackford
author_sort	Bong, Rackford
title	Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws
title_short	Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws
title_full	Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws
title_fullStr	Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws
title_full_unstemmed	Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws
title_sort	hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws
granting_institution	Universiti Teknologi Malaysia, Faculty of Engineering - School of Civil Engineering
granting_department	Faculty of Engineering - School of Civil Engineering
publishDate	2021
url	http://eprints.utm.my/id/eprint/98226/1/RackfordBongPSKA2021.pdf
_version_	1776100560466870272

Hybrid connection of cold formed steel plates utilizing adhesive and self-drilling screws

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