Temperature Distributions and Variations in Concrete Box-Girder Bridges: Experimental and Finite Element Parametric Studies

Tayşi, Nildem; Abid, Sallal R.

doi:10.1260/1369-4332.18.4.469

Cited by 87 publications

(41 citation statements)

References 17 publications

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“…Previous researches showed that such thermal loads can cause serious undesirable effects like concrete cracking [1]. Several experimental researches were conducted to evaluate the thermal response of concrete beams [2][3][4][5][6][7][8], while other experimental researches were directed to study these effects on steel beams [9][10][11]. However, the experimental researches that investigate the effect of the atmospheric thermal loads on composite beams are few in the literature [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Thermal Response of Encased Composite Beams

Abid¹,

Mussa²,

Tayşi³

2018

IJET

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Many types of structures, or part of which, are directly under the exposure of the time-dependent variations of the temperature of air and solar radiation. Such thermal loads can vary the temperature of the different parts of the structural members causing undesired structural effects. In this research, an experimental study was conducted to investigate the influence of such thermal loads on composite beams. For this purpose, a concrete-encased-steel beam was instrumented with fifteen thermocouples and other sensors. The records were captured for a sunny winter day with moderately high daily air temperature difference of more than 18 oC and a solar radiation of more than 700 W/m2. The results showed that the hourly temperature variation and the sun movement in addition to the altitude angle of sun rays control the vertical and lateral temperature distributions of the beam. The maximum recorded difference between hourly maximum and minimum temperatures of the beam was 12.5 oC.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Thermal Response of Encased Composite Beams

Abid¹,

Mussa²,

Tayşi³

2018

IJET

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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%

“…For the external thermal boundary condition, the temperatures associated with solar radiation, convection, irradiation, and the temperature of the surrounding fluid medium, as well as the overall heat transfer coefficient (which is the combination of the convection heat transfer coefficient and the radiation heat transfer coefficient), should be taken into account [7,[13][14][15][16][17]22,23,25,36,[39][40][41][42][43][44][45][46]. The internal thermal boundary condition is affected by the temperatures inside the cavities and the convection heat transfer coefficient because it is not influenced by solar radiation [7,[13][14][15][16][17]22,23,25,36,39,40,[42][43][44][45][46].The ambient air temperature can be measured by a meteorological station. The temperature variation inside the cavity is usually less than that of the ambient air temperature and has a time delay [42,43] because there is no solar radiation inside the cavity and the thermal conductivity of concrete is low.…”

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confidence: 99%

“…In order to accurately simulate the internal thermal boundary conditions for concrete closed girder cross-sections, researchers have proposed different methods. Temperature sensors were installed inside the cavities by some researchers during the girder construction process to measure the temperature variation curve inside the cavity (hereafter referred to as the Measured Temperature Method) [17,23,25,39,44]. The Measured Temperature Method can reflect the actual temperature inside the cavity, but measurements on site are cost-and time-prohibitive.…”

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confidence: 99%

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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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“…Due to the high cost of bridge instrumentation and the enormous sensors required for such measurements, smaller size experimental girder segments were used by many previous studies [17][18][19][20][21][22][23][24] to evaluate the effect of the environmental thermal loads on the temperature distributions, structural performance, and on the reliability of the obtained data from the SHM systems. Other studies [6,19,[25][26][27][28][29][30][31][32][33][34] used analytical, numerical, and statistical techniques for this purpose.…”

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confidence: 99%

Experimental and finite element investigation of temperature distributions in concrete-encased steel girders

Abid

Mussa

Tayşi

et al. 2017

Struct Control Health Monit

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SummaryThe structural performance of bridge structures is temporal and is mainly controlled by the types of the applied loads. To continuously observe the structural performance of bridges, structural health monitoring sensors that include among many temperature sensors are used. The impact of nonuniform temperature distributions in bridge girders due to the environment thermal loads has been recognized by former researchers and bridge design codes. To evaluate these and other effects on the structural behavior of bridge structures, many field and experimental structural health monitoring studies were carried out. However, more researches are required to investigate the temperature distributions in other girder configurations. This work is directed to investigate the impact of air temperature and solar radiation on temperature gradient distributions in concrete-encased composite girders. For this purpose, an experimental concrete-encased steel girder segment was instrumented with thermocouples and other sensors. The experimental data recording continued for 6 months during the hot and cold seasons. Furthermore, a thermal finite element (FE) parametric study was conducted to investigate the effect of the girder size. The test results showed that the vertical and lateral temperature gradient distributions and the variation of the temperature gradients with time are controlled by the amount and location of the received solar radiations. The FE analysis showed that the daily temperature variations are higher in smaller girders, whereas the temperature gradients are smaller than in larger girders. Moreover, the FE results showed that the thickness of the girder's concrete members has an important impact on temperature gradients and temperature distributions.

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Temperature Distributions and Variations in Concrete Box-Girder Bridges: Experimental and Finite Element Parametric Studies

Cited by 87 publications

References 17 publications

Experimental Investigation of Thermal Response of Encased Composite Beams

Experimental Investigation of Thermal Response of Encased Composite Beams

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

Experimental and finite element investigation of temperature distributions in concrete-encased steel girders

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