An experimental and numerical study on temperature gradient and thermal stress of CFST truss girders under solar radiation

Peng, G; Nakamura, S; Zhu, X; Wu, Q; Wang, H

An experimental and numerical study on temperature gradient and thermal stress of CFST truss girders under solar radiation

Peng, G Nakamura, S Zhu, X

Wu, Q Wang, H

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Publication Type:: Journal Article
Citation:: Computers and Concrete, 2017, 20 (5), pp. 605 - 616
Issue Date:: 2017-11-01

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Field	Value	Language
dc.contributor.author	Peng, G	en_US
dc.contributor.author	Nakamura, S	en_US
dc.contributor.author	Zhu, X https://orcid.org/0000-0001-5083-9320	en_US
dc.contributor.author	Wu, Q	en_US
dc.contributor.author	Wang, H	en_US
dc.date.issued	2017-11-01	en_US
dc.identifier.citation	Computers and Concrete, 2017, 20 (5), pp. 605 - 616	en_US
dc.identifier.issn	1598-8198	en_US
dc.identifier.uri	http://hdl.handle.net/10453/125446
dc.description.abstract	Copyright © 2017 Techno-Press, Ltd. Concrete filled steel tubular (CFST) composite girder is a new type of structures for bridge constructions. The existing design codes cannot be used to predict the thermal stress in the CFST truss girder structures under solar radiation. This study is to develop the temperature gradient curves for predicting thermal stress of the structure based on field and laboratory monitoring data. An in-field testing had been carried out on Ganhaizi Bridge for over two months. Thermal couples were installed at the cross section of the CFST truss girder and the continuous data was collected every 30 minutes. A typical temperature gradient mode was then extracted by comparing temperature distributions at different times. To further verify the temperature gradient mode and investigate the evolution of temperature fields, an outdoor experiment was conducted on a 1:8 scale bridge model, which was installed with both thermal couples and strain gauges. The main factors including solar radiation and ambient temperature on the different positions were studied. Laboratory results were consistent with that from the in-field data and temperature gradient curves were obtained from the in-field and laboratory data. The relationship between the strain difference at top and bottom surfaces of the concrete deck and its corresponding temperature change was also obtained and a method based on curve fitting was proposed to predict the thermal strain under elevated temperature. The thermal stress model for CFST composite girder was derived. By the proposed model, the thermal stress was obtained from the temperature gradient curves. The results using the proposed model were agreed well with that by finite element modelling.	en_US
dc.relation.ispartof	Computers and Concrete	en_US
dc.relation.isbasedon	10.12989/cac.2017.20.5.605	en_US
dc.subject.classification	Building & Construction	en_US
dc.title	An experimental and numerical study on temperature gradient and thermal stress of CFST truss girders under solar radiation	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	20	en_US
utslib.for	0905 Civil Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	20	en_US

Abstract:

Copyright © 2017 Techno-Press, Ltd. Concrete filled steel tubular (CFST) composite girder is a new type of structures for bridge constructions. The existing design codes cannot be used to predict the thermal stress in the CFST truss girder structures under solar radiation. This study is to develop the temperature gradient curves for predicting thermal stress of the structure based on field and laboratory monitoring data. An in-field testing had been carried out on Ganhaizi Bridge for over two months. Thermal couples were installed at the cross section of the CFST truss girder and the continuous data was collected every 30 minutes. A typical temperature gradient mode was then extracted by comparing temperature distributions at different times. To further verify the temperature gradient mode and investigate the evolution of temperature fields, an outdoor experiment was conducted on a 1:8 scale bridge model, which was installed with both thermal couples and strain gauges. The main factors including solar radiation and ambient temperature on the different positions were studied. Laboratory results were consistent with that from the in-field data and temperature gradient curves were obtained from the in-field and laboratory data. The relationship between the strain difference at top and bottom surfaces of the concrete deck and its corresponding temperature change was also obtained and a method based on curve fitting was proposed to predict the thermal strain under elevated temperature. The thermal stress model for CFST composite girder was derived. By the proposed model, the thermal stress was obtained from the temperature gradient curves. The results using the proposed model were agreed well with that by finite element modelling.

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http://hdl.handle.net/10453/125446