Field test on temperature field and thermal stress for prestressed concrete box-girder bridge

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.

Keywords

box-girder bridge / field test / hydration heat / temperature field / temperature gradient / thermal stress

References

[1] Chen Zhaoyuan, Cui Jinghao, Zhu Jinquan, An Mingze, Yu Zhefu. Analysis and control of cracking in reinforced concrete. Engineering Mechanics, 2006, 23(suppl): 86-107 (in Chinese)

[2] Zhang Yuanhai, Li Qiao. Analysis of thermal stress for prestressed concrete continuous box-girder bridges. Chinese Journal of Civil Engineering, 2006, 39(3): 98-102 (in Chinese)

[3] Karakouzian M. Effect of reinforcement temperature in shrinkage cracking of PC. Concrete International, 1995, (12): 83-99

[4] Wang Jiachun, Yan Peiyu. Analysis of early-age thermal stress in concrete structure. Journal of Southeast University (Natural Science Edition), 2005, 35(suppl): 15-18 (in Chinese)

[5] Lv Jian, Ye Peiyu, Wang Zonggang. Analysis of thermal stress in early age concrete based on aging degree method. Engineering Mechanics, 2006, 23(sup1.): 140-144 (in Chinese)

[6] Schutter G D. Finite element simulation of thermal cracking in massive hardening concrete elements using degree of hydration based material laws. Computers and Structures, 2002, 80(27): 2035-2042

[7] Kim J K, Moon Y H, Eo S H. Compressive strength development of concrete with different curing time and temperature. Cement and Concrete Research, 1998, 28(12): 1761-1773

[8] Kjellsen K O, Detwiler R J. Later-age strength prediction by a modified maturity model. ACI Materials Journal, 1993, 90(3): 220-227

[9] Peng Yousong, Qiang Shizhong. Investigation into computational method of self-equilibrating thermal stress in concrete bridges. Journal of Southwest Jiaotong University, 2006, 41(4): 452-455 (in Chinese)

[10] Enrique M,Antonio A. Distribution of temperature and stress in concrete box girder bridge. Journal of Structural Engineering, ASCE, 1990, 116 (9): 2388-2409

[11] Feng Defei, Lu Wenliang. Experimental research on hydration temperature of concrete box girder. Journal of Railway Engineering Society, 2006, (8): 62-67 (in Chinese)

[12] Cheng Junrui, Ji Yuwen, Lu Wenliang, Liu Songtao. Experimental research on thermal strain under hydration heating of pre-stress concrete box beam. Journal of Highway and Transportation Research and Development, 2003, 20(6): 76-79 (in Chinese)

[13] China Highway Planning and Design Institute. General Code for Design of Highway Bridges and Culverts (JTG D60-2004). Beijing: China Communications Press, 2004 (in Chinese)

[14] British Standard Institute. BS5400, Part 5, Concrete and composite bridges. London, 1979

[15] Peng D W, Li G F, Huang X G. Bridge Engineering. Beijing: China Communications Press, 2007 (in Chinese)

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg