Field test on temperature field and thermal stress for prestressed concrete box-girder bridge |
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Authors: | Baoguo Chen Rui Ding Junjie Zheng and Shibiao Zhang |
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Affiliation: | (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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Abstract: | 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.
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Translated from Journal of Huazhong University of Science and Technology (Urban Science Edition), 2007, 24(4): 83–97 译自: 华中科技大学学报 (城市科学版)] |
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Keywords: | box-girder bridge field test hydration heat temperature field temperature gradient thermal stress |
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