Vertical temperature gradients of concrete box girder caused by solar radiation in Sichuan-Tibet railway

Shi, Tao; Sheng, Xia; Zheng, Weiqi; Lou, Ping

doi:10.1631/jzus.a2100401

Cited by 10 publications

(2 citation statements)

References 28 publications

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“…Larsson and Thelandersson's work [20] evaluated extreme value data related to temperature gradients in concrete structures, which are essential for bridge design under extreme climate conditions. Investigating the form of temperature gradients in concrete box girders during cold wave events specific to certain regions holds significant importance for designing such structures [21,22].…”

Section: Introductionmentioning

confidence: 99%

Temperature Distribution Characteristics and Action Pattern of Concrete Box Girder under Low-Temperature and Cold Wave Conditions

Li,

Ba,

Zhang

et al. 2024

Applied Sciences

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In regions with severe cold and high latitudes, concrete structures are susceptible to cracking and displacement due to uneven temperature stress, which directly impacts their normal utilization. Therefore, to investigate the temperature distribution characteristics of concrete box girders under the combined influence of low temperatures and cold waves, a temperature test was conducted on a model of concrete box girders in Xinjiang Province, China. Based on the measured data, the distribution pattern of the most unfavorable negative temperature differential observed in high-latitude regions was determined. Long-term numerical simulation and extreme value analysis were performed using historical meteorological data, revealing that the vertical negative temperature gradient in the concrete box girder structures follows a composite exponential distribution. The temperature differential at the top complies with Chinese code requirements, while at the bottom, it aligns more closely with British standard BS5400. Statistical analysis of historical meteorological data predicts that the 50-year temperature differential will result in a drop amplitude of 26.42 °C, which is 1.44 times higher than measured values obtained from experiments. The proposed negative temperature gradient pattern for concrete box girders presented in this study can encompass general design codes and provide guidance for designing concrete bridges in severe cold areas.

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Section: Introductionmentioning

confidence: 99%

Temperature Distribution Characteristics and Action Pattern of Concrete Box Girder under Low-Temperature and Cold Wave Conditions

Li,

Ba,

Zhang

et al. 2024

Applied Sciences

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“…An efficient vertical discrete model was established for the efficient numerical calculation of concrete temperatures by Fan et al 20 , and the predicted temperatures matched well with the measured values. Shi et al 21 and Lin et al 22 , 23 used both methods to reveal the influence of temperature distribution on various concrete structures. Usually, it is more convenient to evaluate the temperature distribution by numerical simulation than by long-term field measurement since numerical simulation is repeatable and applicable in the design phase.…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental analysis of concrete temperature and energy considering open-air environmental variations

Yang,

Li,

Zhuo

et al. 2024

Sci Rep

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Longwave radiation is an important open-air environmental factor that can significantly affect the temperature of concrete, but it has often been ignored in the temperature analysis of open-air concrete structures. In this article, an improved analytical model of concrete temperature was proposed by considering solar radiation, thermal convection, thermal conduction and especially longwave radiation. Temperature monitoring of an open-air concrete block was carried out to verify the proposed model and analyze the heat energy characteristics of open-air concrete. As demonstrated by the open-air experiment, under the influence of longwave radiation, the temperature at the top of the concrete block could decrease rapidly at night and even become lower than the minimum temperature at its bottom. Compared with the analytical model that ignores longwave radiation, the improved model that includes it better matches the measured temperature. According to the energy analysis, although solar radiation controls the transient variation in heat energy, the heat exchange caused by longwave radiation were more than that caused by convection on sunlit surfaces, which indicates the importance of considering longwave radiation.

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Thermal arching and interfacial damage evolution of CRTS-II slab track under solar radiation in alpine and plateau regions

Lou

Shi

2023

Alexandria Engineering Journal

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Vertical temperature gradients of concrete box girder caused by solar radiation in Sichuan-Tibet railway

Cited by 10 publications

References 28 publications

Temperature Distribution Characteristics and Action Pattern of Concrete Box Girder under Low-Temperature and Cold Wave Conditions

Temperature Distribution Characteristics and Action Pattern of Concrete Box Girder under Low-Temperature and Cold Wave Conditions

Analytical and experimental analysis of concrete temperature and energy considering open-air environmental variations

Thermal arching and interfacial damage evolution of CRTS-II slab track under solar radiation in alpine and plateau regions

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