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

doi:10.1007/s11709-009-0002-9

Front Arch Civil Eng Chin

2009, Vol. 3

Issue (2) : 158-164 https://doi.org/10.1007/s11709-009-0002-9

RESEARCH ARTICLE

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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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

Corresponding Author(s): CHEN Baoguo,Email:baoguo_chen@126.com

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.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-009-0002-9
https://academic.hep.com.cn/fsce/EN/Y2009/V3/I2/158

Fig.1 Sketch of instrumented cross-sections

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

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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