Failures of roof structures caused by wind uplift forces

The weakness of the tying down systems between the structural elements has been identified as the main cause of the failure of light roof structures due to uplifting pressure from the wind. These weaknesses have caused part of the roof structure being blown off during thunderstorms. This project rep...

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Main Author:	Zainul Amri, Haidar Akma
Format:	Thesis
Language:	English
Published:	2010
Subjects:	TA Engineering (General) Civil engineering (General) TH Building construction
Online Access:	http://eprints.utm.my/id/eprint/16417/5/HaidarAkmaZainulAmriMFKA2010.pdf
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id	my-utm-ep.16417
record_format	uketd_dc
spelling	my-utm-ep.164172017-09-20T03:28:49Z Failures of roof structures caused by wind uplift forces 2010-12 Zainul Amri, Haidar Akma TA Engineering (General). Civil engineering (General) TH Building construction The weakness of the tying down systems between the structural elements has been identified as the main cause of the failure of light roof structures due to uplifting pressure from the wind. These weaknesses have caused part of the roof structure being blown off during thunderstorms. This project report presents the results of a study carried out to evaluate the load carrying capacities of joints for zinc/asbestos sheeting to purlin, purlin to rafter and rafter to roof beam in the frame structure for light roof construction. The capacities of these joints were determined from laboratory tests on respective samples and also from previous related tests. Comparisons were made with the calculated pressures from the wind and hence the pulling out forces exerted on each type of joint on modeled buildings representing the low and high rise houses located areas similar to those which experienced failure. Details of the structural configuration and types of joints adopted were within the range found in actual construction. The result show that the number of tying down points between members within a specified area of roof and the depth of penetration of the nails at three points currently adopted are inadequate. They are only sufficient to sustain forces exerted by the wind speeds of up to wind speeds of up to 10m/s and 50m/s in low and high rises building respectively. It was also proposed that the pitches between purlin and also between rafters in the present construction be reduced in order to achieve more connection points. 2010-12 Thesis http://eprints.utm.my/id/eprint/16417/ http://eprints.utm.my/id/eprint/16417/5/HaidarAkmaZainulAmriMFKA2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General) TH Building construction
spellingShingle	TA Engineering (General) Civil engineering (General) TH Building construction Zainul Amri, Haidar Akma Failures of roof structures caused by wind uplift forces
description	The weakness of the tying down systems between the structural elements has been identified as the main cause of the failure of light roof structures due to uplifting pressure from the wind. These weaknesses have caused part of the roof structure being blown off during thunderstorms. This project report presents the results of a study carried out to evaluate the load carrying capacities of joints for zinc/asbestos sheeting to purlin, purlin to rafter and rafter to roof beam in the frame structure for light roof construction. The capacities of these joints were determined from laboratory tests on respective samples and also from previous related tests. Comparisons were made with the calculated pressures from the wind and hence the pulling out forces exerted on each type of joint on modeled buildings representing the low and high rise houses located areas similar to those which experienced failure. Details of the structural configuration and types of joints adopted were within the range found in actual construction. The result show that the number of tying down points between members within a specified area of roof and the depth of penetration of the nails at three points currently adopted are inadequate. They are only sufficient to sustain forces exerted by the wind speeds of up to wind speeds of up to 10m/s and 50m/s in low and high rises building respectively. It was also proposed that the pitches between purlin and also between rafters in the present construction be reduced in order to achieve more connection points.
format	Thesis
qualification_level	Master's degree
author	Zainul Amri, Haidar Akma
author_facet	Zainul Amri, Haidar Akma
author_sort	Zainul Amri, Haidar Akma
title	Failures of roof structures caused by wind uplift forces
title_short	Failures of roof structures caused by wind uplift forces
title_full	Failures of roof structures caused by wind uplift forces
title_fullStr	Failures of roof structures caused by wind uplift forces
title_full_unstemmed	Failures of roof structures caused by wind uplift forces
title_sort	failures of roof structures caused by wind uplift forces
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2010
url	http://eprints.utm.my/id/eprint/16417/5/HaidarAkmaZainulAmriMFKA2010.pdf
_version_	1747815038417108992

Failures of roof structures caused by wind uplift forces

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