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Frontiers of Structural and Civil Engineering

Front Arch Civil Eng Chin    2009, Vol. 3 Issue (2) : 158-164
Field test on temperature field and thermal stress for prestressed concrete box-girder bridge
Baoguo CHEN1(), Rui DING1, Junjie ZHENG1, Shibiao ZHANG2
1. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Shi-man Expressway Construction Headquarters of Hubei Province, Shiyan 432000, China
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A field test was conducted to investigate the distribution of temperature field and the variation of thermal stress for a prestressed concrete (PC) box-girder bridge. The change of hydration heat temperature consists of four periods: temperature rising period, constant temperature period, rapid temperature fall period and slow temperature fall period. The peak value of hydration heat temperature increases with the increasing casting temperature of concrete; the relation between them is approximately linear. According to field tests, the thermal stress incurred by hydration heat may induce temperature cracks on the PC box-girder. Furthermore, the nonlinear distribution of temperature gradient and the fluctuation of thermal stress induced by exposure to sunlight were also obtained based on continuous in-situ monitoring. Such results show that the prevailing Chinese Code (2004) is insufficient since it does not take into account the temperature gradient of the bottom slab. Finally, some preventive measures against temperature cracks were proposed based on related studies. The conclusions can provide valuable reference for the design and construction of PC box-girder bridges.

Keywords box-girder bridge      field test      hydration heat      temperature field      temperature gradient      thermal stress     
Corresponding Authors: CHEN Baoguo,   
Issue Date: 05 June 2009
 Cite this article:   
Baoguo CHEN,Rui DING,Junjie ZHENG, et al. Field test on temperature field and thermal stress for prestressed concrete box-girder bridge[J]. Front Arch Civil Eng Chin, 2009, 3(2): 158-164.
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Baoguo CHEN
Junjie ZHENG
Shibiao ZHANG
Fig.1  Sketch of instrumented cross-sections
web /cm65656565655540404040
bottom slab /cm70666055504540363330
Tab.1  Thickness of web and bottom slab
Fig.2  Typical dimensions of cross-section
Fig.3  Layouts of thermocouples and stain gauges. (a) Thermocouple-1; (b) thermocouple-2; (c) strain gauge
Fig.4  Temperature of hydration in cross-section s6#
Fig.5  Variation of hydration heat temperature. (a) Top slab of box girder; (b) bottom slab of box girder; (c) web of box girder
Fig.6  Variation of air temperature during curing time
Fig.7  Relation between casting temperature and peak temperature of hydration heat
Fig.8  Variation of thermal strain in cross-sections M-I
Fig.9  Variation of thermal strain in cross-sections M-II
Fig.10  Variation of temperature in concrete
Fig.11  Distribution of temperature field along height of box-girder
Fig.12  Distribution of temperature gradient along height of box-girder
codesinfluence depth of temperature /mmtemperature gradient /°C
beneath top surfaceon bottom surfacetop surfacebottom surface100 mm beneath top surface
New Zealand120020032.01.520.7
field test80030020.3-24.15.6-8.013.9-16.5
Tab.2  Comparison of temperature gradient between field test and Codes
Fig.13  Variation of thermal stress in cross-section I
Fig.14  Variation of thermal stress in cross-section II
Fig.15  Variation of thermal stress in cross-section III
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