Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures

Fire resistance of steel joints is one of the major concerns when designing structures against extreme hazards. However, little information is available for Circular Hollow Section (CHS) joints in fire condition, especially forT-joints. In order to gain greater insight into the static behaviour ofCH...

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Main Authors: Nguyen, M. P., Tan, K. H., Fung, Tat Ching
Other Authors: School of Civil and Environmental Engineering
Format: Conference or Workshop Item
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/98320
http://hdl.handle.net/10220/13417
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-983202020-03-07T11:43:28Z Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures Nguyen, M. P. Tan, K. H. Fung, Tat Ching School of Civil and Environmental Engineering International Symposium on Tubular Structures (14th : 2012 : London, UK) Fire resistance of steel joints is one of the major concerns when designing structures against extreme hazards. However, little information is available for Circular Hollow Section (CHS) joints in fire condition, especially forT-joints. In order to gain greater insight into the static behaviour ofCHSconnections, this paper presents an experimental study of CHS T-joints subjected to in-plane bending with variation of brace-to-chord diameter ratios (β) under elevated temperatures. The tests were conducted with five specimens in isothermal heating condition where the joints were heated to the desired temperatures and then subjected to static load until failure occurred. The failure modes and ultimate strengths of such joints under various isothermal temperatures were investigated and compared with the corresponding joints at the ambient condition. Within the range of investigated parameters, at 700◦C, the joint strength was only 8.40 kNm while at ambient temperature, it was 43.25 kNm. Furthermore, at high temperature, there was a change in the failure modes of the joints. Cracks formed around the weld toes before the joints reach excessive deformation. These cracks affected post-yield strength in moment-rotation curves of the joints. In order to understand the development of cracks around the welded region, material tests were performed to determine the fracture strains of chord material beneath the center weld at high temperatures. To the authors’ best knowledge, these structural tests were among the first reported experimental investigations on the ultimate strength and failure mechanisms of tubular joints at elevated temperature. 2013-09-09T07:44:52Z 2019-12-06T19:53:32Z 2013-09-09T07:44:52Z 2019-12-06T19:53:32Z 2012 2012 Conference Paper https://hdl.handle.net/10356/98320 http://hdl.handle.net/10220/13417 10.1201/b13139-87 en © 2012 Taylor & Francis Group, London
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
description Fire resistance of steel joints is one of the major concerns when designing structures against extreme hazards. However, little information is available for Circular Hollow Section (CHS) joints in fire condition, especially forT-joints. In order to gain greater insight into the static behaviour ofCHSconnections, this paper presents an experimental study of CHS T-joints subjected to in-plane bending with variation of brace-to-chord diameter ratios (β) under elevated temperatures. The tests were conducted with five specimens in isothermal heating condition where the joints were heated to the desired temperatures and then subjected to static load until failure occurred. The failure modes and ultimate strengths of such joints under various isothermal temperatures were investigated and compared with the corresponding joints at the ambient condition. Within the range of investigated parameters, at 700◦C, the joint strength was only 8.40 kNm while at ambient temperature, it was 43.25 kNm. Furthermore, at high temperature, there was a change in the failure modes of the joints. Cracks formed around the weld toes before the joints reach excessive deformation. These cracks affected post-yield strength in moment-rotation curves of the joints. In order to understand the development of cracks around the welded region, material tests were performed to determine the fracture strains of chord material beneath the center weld at high temperatures. To the authors’ best knowledge, these structural tests were among the first reported experimental investigations on the ultimate strength and failure mechanisms of tubular joints at elevated temperature.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Nguyen, M. P.
Tan, K. H.
Fung, Tat Ching
format Conference or Workshop Item
author Nguyen, M. P.
Tan, K. H.
Fung, Tat Ching
spellingShingle Nguyen, M. P.
Tan, K. H.
Fung, Tat Ching
Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures
author_sort Nguyen, M. P.
title Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures
title_short Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures
title_full Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures
title_fullStr Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures
title_full_unstemmed Structural behavior of CHS T-joints subjected to brace in-plane bending at elevated temperatures
title_sort structural behavior of chs t-joints subjected to brace in-plane bending at elevated temperatures
publishDate 2013
url https://hdl.handle.net/10356/98320
http://hdl.handle.net/10220/13417
_version_ 1681045804818628608