Experimental analysis of temperature gradients in concrete box-girders

Abid, Sallal R.; Tayşi, Nildem; Özakça, Mustafa

doi:10.1016/j.conbuildmat.2015.12.144

Cited by 100 publications

(43 citation statements)

References 6 publications

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“…Studies have shown that the maximum vertical temperature gradient of bridge structure in the sunshine generally occurs in summer [24,25]. In the present study, the temperature field of the steel box girder in the summer of 2018 is calculated to obtain the most disadvantageous temperature distribution of the steel box girder.…”

Section: Analysis Of Calculation Resultsmentioning

confidence: 94%

Analysis of Sunshine Temperature Field of Steel Box Girder Based on Monitoring Data

Hao

Zhong³

et al. 2020

Advances in Civil Engineering

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In this study, based on the recorded meteorological data of the bridge site, a spatial-temporal temperature model of a 3-span steel box girder is developed through applying the thermal analysis software TAITHERM. Firstly, the rationality and dependability of the proposed spatial-temporal temperature model are adequately verified by means of implementing the comparison with the measurement data. Then the temperature distribution of the steel box girder is analyzed and discussed in detail. The analytical results show that the time of the bottom of pavement reaching the daily maximum temperature lags behind the top of pavement by 2 or 3 hours due to the thermal insulation effect of pavement, and the maximum vertical temperature gradient of the structure exceeds the existing standards. Moreover, with the help of the analytical model, a parametric study of comprehensively meteorological factors is also performed. The results of the sensitivity analysis indicate that solar radiation is the most significant factor affecting the maximum vertical temperature gradient of the steel box girder, followed by air temperature and wind speed. After that, with the representative values of the extreme meteorological parameters during 100-year return period in Wuhan City in China being considered as the thermal boundary conditions, the temperature distribution of the steel box girder is further studied for investigation purpose. The results demonstrate that the heat conduction process of the steel box girder has distinct “box-room effect,” and it is of great necessity to consider both the actual weather conditions at the bridge site and the “box-room effect” of steel box girder when calculating thermal behaviors of bridge structures. Finally, it is related that the particular method proposed in this paper possesses a satisfactory application prospect for temperature field analysis upon various types of bridges in different regions.

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Section: Analysis Of Calculation Resultsmentioning

confidence: 94%

Analysis of Sunshine Temperature Field of Steel Box Girder Based on Monitoring Data

Hao

Zhong³

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…23. In addition to R 2 , the average absolute error (AAE) and the root-mean-square error (RMSE) [35] were also used to check the accuracy of the proposed formulae. For γ c,max , t 0 , t 1 and t 2 , all the R 2 exceed 0.97.…”

Section: Evolutionary Pattern Of Ctrmentioning

confidence: 99%

Research on temperature action and cracking risk of steel–concrete composite girder during the hydration process

Liu

Zhang

et al. 2020

Archiv.Civ.Mech.Eng

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Temperature changes due to hydration heat often cause cracks in the early-age concrete deck of steel-concrete composite girder bridges, even before opening to traffic. However, no available methods are provided in current specifications for the thermal effect calculation. To fill this gap, large-scale temperature measurements and fine finite-element model (FEM) analysis were performed on an actual composite girder bridge. Based on the fully validated FEM, a comprehensive parametric study was carried out to establish the spatio-temporal pattern of hydration-caused temperature, including a vertical pattern and an evolutionary pattern. Finally, a simplified method was presented for the thermal stress calculation of composite girders, and a case study was also provided. Measurements showed that temperature differences of concrete deck varied below 5 °C, much smaller than the entire composite section. FEM analysis then suggested that the influence of solar radiation can be basically ignored compared with hydration heat. The spatio-temporal pattern in the form of the coefficient of temperature rise was proposed based on the above findings and parametric study, and the reliability was properly verified with experimental or FEM results. For the final simplified method, the case study demonstrated that it can effectively facilitate the thermal stress calculation of composite girders during hydration process by adopting the proposed spatio-temporal pattern. As such, preliminary curing schemes can be easily selected to control the concrete cracking risk before casting.

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“…">IntroductionClosed girder cross-sections, such as box girders, small box girders, and adjacent box girders, are typically used worldwide for concrete bridges [1][2][3][4][5][6][7][8][9][10][11][12][13]. Numerous cases of recorded bridge damages, such as severe cracking, deterioration, or even failure, particularly in bridges with closed girder cross-sections, were caused by temperature-induced stresses and deformations [14][15][16][17][18][19][20][21][22][23][24][25][26]. Therefore, it is particularly important to accurately predict the temperature distributions on closed girder cross-sections.…”

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confidence: 99%

“…It can be observed from the field test data that the differences between the temperatures inside the cavities and the ambient air temperature were large in the summer because of high solar radiation, while the temperature differences were small in the winter. The daily measured temperature responses obtained at different times of year have been used by researchers to analyze the temperature distributions on cross-sections [13,22,24,25,39]. Due to space limitations, the data from 13 August 2017 in summer, which is a sunny day with the highest ambient air temperature during the monitoring period, as well as high solar radiation and low wind speed, were selected for analysis.…”

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confidence: 99%

Research on the Internal Thermal Boundary Conditions of Concrete Closed Girder Cross-Sections under Historically Extreme Temperature Conditions

et al. 2020

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The accuracy of the finite element model (FEM) for concrete closed girder cross-sections is significantly influenced by thermal boundary conditions. The internal thermal boundary conditions can be simulated by inputting the convection heat transfer coefficient and the temperatures inside the cavities or by establishing air elements in the FEM. In order to analyze the influence of different simulation methods for the internal thermal boundary conditions on temperature distributions for concrete closed girder cross-sections, the temperature distributions on the cross-sections of a box girder, small box girders, and adjacent box girders were monitored, and the corresponding FEMs were implemented. By comparing the temperature data obtained from the field test and FEMs, the numerical hourly temperature curves calculated by using the measured temperatures inside the cavities provide the closest agreement with the measured results; however, the measurements of the temperatures on site are cost- and time-prohibitive. When there is a lack of measured temperatures inside the cavities, the numerical hourly temperature curves calculated by establishing air elements in the FEM provide the closest agreement. The influences of different simulation methods for the internal thermal boundary conditions on the highest hourly average effective temperatures and the trends of the vertical temperature gradients for concrete closed girder cross-sections were small. The FEM with air elements can be adopted to analyze the temperature distributions on concrete closed girder cross-sections under historically extreme temperature conditions. It can be predicted that the longitudinal thermal movement of concrete closed girders would be underestimated by considering variations in the one-year measured average effective temperature of the cross-sections or the Chinese-code-specified design effective temperature for the highway bridge structures, which are thus unconservative for engineering applications. The Chinese-code-specified design vertical temperature gradients are conservative for the bridge deck surface and unconservative for the bottom flange.

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Experimental analysis of temperature gradients in concrete box-girders

Cited by 100 publications

References 6 publications

Analysis of Sunshine Temperature Field of Steel Box Girder Based on Monitoring Data

Analysis of Sunshine Temperature Field of Steel Box Girder Based on Monitoring Data

Research on temperature action and cracking risk of steel–concrete composite girder during the hydration process

Research on the Internal Thermal Boundary Conditions of Concrete Closed Girder Cross-Sections under Historically Extreme Temperature Conditions

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