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Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand

Fiber Reinforced Polymer (FRP) is one of the most popular methods for structural repairing and strengthening due to several properties such as non-corroding, higher strength, lighter weight, fatigue resistant, high modulus of elasticity, and low density. Extensive studies have been carried out on st...

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Main Author: Newsha , Abdollahi Chahkand
Format: Thesis
Published: 2013
Subjects:
T Technology (General)
TA Engineering (General). Civil engineering (General)
TF Railroad engineering and operation
Online Access:http://studentsrepo.um.edu.my/7714/4/Newsha_Abdollahi_Chahkand.pdf
http://studentsrepo.um.edu.my/7714/
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spelling my.um.stud.77142018-04-21T08:53:45Z Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand Newsha , Abdollahi Chahkand T Technology (General) TA Engineering (General). Civil engineering (General) TF Railroad engineering and operation Fiber Reinforced Polymer (FRP) is one of the most popular methods for structural repairing and strengthening due to several properties such as non-corroding, higher strength, lighter weight, fatigue resistant, high modulus of elasticity, and low density. Extensive studies have been carried out on strengthening of steel members in flexural, shear, buckling, tensile, enhancing fatigue life and enhancing stability of steel members with FRP. It was found that there was no published literature concerning the investigation of torsional behavior of steel structures strengthened with FRP. This study examines the performance of Carbon Fiber Reinforced Polymer (CFRP) strengthened square hollow section (SHS) to withstand torsional moment using novel wrapping configurations of fiber reinforced polymer. Fifteen beam specimens were tested in order to investigate the effects of different number of layers and CFRP orientations on the performance of strengthened SHS under pure torsion. To investigate the effect of width to thickness ratio of SHS, two sets of specimens with different thickness were considered. In addition, theoretical predictions of ultimate torsional capacity of strengthened square hollow steel section beams were proposed based on classical torsion theory with modified geometric properties of the strengthened specimens. The best strengthening scheme was obtained for the specimen with four layers of alternating spiral (-45º) and reverse-spiral (45º) arrangement of CFRP with respect to the longitudinal axis of the specimen. The experimental results showed that CFRP strengthening of torsional member was more effective on a beam with larger width to thickness ratio. In general, it was observed that the failure mode of specimens strengthened with spiral direction fiber orientation was splitting, while the failure mode of reverse-spiral direction was rupture and debonding. By comparing the experimental results and the calculated values using the simplified expression, it was found that the values were in good agreement. 2013 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/7714/4/Newsha_Abdollahi_Chahkand.pdf Newsha , Abdollahi Chahkand (2013) Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand. Masters thesis, University of Malaya. http://studentsrepo.um.edu.my/7714/
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Student Repository
url_provider http://studentsrepo.um.edu.my/
topic T Technology (General)
TA Engineering (General). Civil engineering (General)
TF Railroad engineering and operation
spellingShingle T Technology (General)
TA Engineering (General). Civil engineering (General)
TF Railroad engineering and operation
Newsha , Abdollahi Chahkand
Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand
description Fiber Reinforced Polymer (FRP) is one of the most popular methods for structural repairing and strengthening due to several properties such as non-corroding, higher strength, lighter weight, fatigue resistant, high modulus of elasticity, and low density. Extensive studies have been carried out on strengthening of steel members in flexural, shear, buckling, tensile, enhancing fatigue life and enhancing stability of steel members with FRP. It was found that there was no published literature concerning the investigation of torsional behavior of steel structures strengthened with FRP. This study examines the performance of Carbon Fiber Reinforced Polymer (CFRP) strengthened square hollow section (SHS) to withstand torsional moment using novel wrapping configurations of fiber reinforced polymer. Fifteen beam specimens were tested in order to investigate the effects of different number of layers and CFRP orientations on the performance of strengthened SHS under pure torsion. To investigate the effect of width to thickness ratio of SHS, two sets of specimens with different thickness were considered. In addition, theoretical predictions of ultimate torsional capacity of strengthened square hollow steel section beams were proposed based on classical torsion theory with modified geometric properties of the strengthened specimens. The best strengthening scheme was obtained for the specimen with four layers of alternating spiral (-45º) and reverse-spiral (45º) arrangement of CFRP with respect to the longitudinal axis of the specimen. The experimental results showed that CFRP strengthening of torsional member was more effective on a beam with larger width to thickness ratio. In general, it was observed that the failure mode of specimens strengthened with spiral direction fiber orientation was splitting, while the failure mode of reverse-spiral direction was rupture and debonding. By comparing the experimental results and the calculated values using the simplified expression, it was found that the values were in good agreement.
format Thesis
author Newsha , Abdollahi Chahkand
author_facet Newsha , Abdollahi Chahkand
author_sort Newsha , Abdollahi Chahkand
title Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand
title_short Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand
title_full Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand
title_fullStr Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand
title_full_unstemmed Investigation on torsional behaviour of CFRP strengthened square hollow steel section / Newsha Abdollahi Chahkand
title_sort investigation on torsional behaviour of cfrp strengthened square hollow steel section / newsha abdollahi chahkand
publishDate 2013
url http://studentsrepo.um.edu.my/7714/4/Newsha_Abdollahi_Chahkand.pdf
http://studentsrepo.um.edu.my/7714/
_version_ 1738506053953257472
score 13.223943

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