RESEARCH ARTICLE


Temperature Effects and Calculation Method of Closure Temperatures for Concrete-filled Steel Tube Arch Rib of Dumbbell-shape Section



Bin Yang*, 1, 2, 3, Jinhua Huang*, 1, 2, 3, Chunjiao Lin*, 1, 2, 3, Xinkun Wen*, 1, 2, 3
1 College of Civil Engineering and Architecture, Guangxi University, P.R. China, 530004
2 Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Nanning, P.R. China
3 Key Laboratory of Disaster Prevention and Engineering Safety of Guangxi, P.R. China


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Creative Commons License
© 2011 Yang et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the No.100, Daxue Road, College of Civil Engineering and Architecture, Guangxi University, Nanning City, Guangxi Province, P.R. China, Post code: 530004; Tel: +86-0771-3236056; Fax: +86-0771-3236273; E-mail: yangbin5612@163.com


Abstract

This paper has done continuous on-site experimental researches on temperature field and temperature effects that are under the influence of hydration heat of concrete during the molding process of dumb-bell CFST arch bridge. Analysis on time-history law of temperature field and temperature effects is made. Results reveal that temperature variation of hydration heat of the concrete within the steel tube is showed as follows: temperature rising-continuous high temperature—temperature dropping—equalizing. The structural temperature field, generated under the effect of hydration- heat in the process of molding arch rib, is nonlinear temperature field. Temperature field of concrete hydration heat has an obvious effect on crown section. Finally, practical methods to calculate the closure temperature of CFST arch rib and the effective measures to reduce the residual internal stress of temperature of arch rib are proposed.

Keywords: Concrete-filled steel tube (CFST), Hydration-heat, Temperature field, Effect, Calculation closure temperature.