Prediction of vertical temperature gradient on concrete box-girder considering different locations in China

Sheng, Xia; Zhou, Tan; Huang, Shiji; Cai, Chenzhi; Shi, Tao

doi:10.1016/j.cscm.2022.e01026

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…6 and Table 1. More details of bridge girder modeling can be found in Cai et al [3] and Sheng et al [23]. The bridge project is on-site pouring.…”

Section: The Bridge Girder Parametermentioning

confidence: 99%

Finite Element Simulation of Temperature Variations in Concrete Bridge Girders

Liu¹,

Wu²,

Zhang³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The internal temperature of cast-in-place concrete bridges undergoes strong variations during the construction as a result of environmental factors. In order to determine precisely such variations, the present study relies on the finite element method, used to model the bridge box girder section and simulate the internal temperature distribution during construction. The numerical results display good agreement with measured temperature values. It is shown that when the external temperature is higher, and the internal and external temperature difference is relatively small, the deviation of the fitting line from existing specifications (Chinese specification, American specification, New Zealand specification) is relatively large and vice versa.

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“…6 and Table 1. More details of bridge girder modeling can be found in Cai et al [3] and Sheng et al [23]. The bridge project is on-site pouring.…”

Section: The Bridge Girder Parametermentioning

confidence: 99%

Finite Element Simulation of Temperature Variations in Concrete Bridge Girders

Liu¹,

Wu²,

Zhang³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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“…Research on the existing concrete temperature testing found that most of the traditional temperature monitoring programs require temperature sensors to be pre-buried in the concrete structure, which has the advantages of intuition and accuracy, but it cannot be applied to the concrete structure in the service stage and the lack of internal concrete temperature information [11], [12], [13]. Compared with the traditional temperature testing program, the method of predicting the change rule of concrete structure temperature by studying the long-term change relationship between the average internal temperature of the concrete structure and the external air temperature of the concrete can grasp the range of the internal temperature change of the concrete more accurately in the absence of the internal temperature information of the concrete [14], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Prediction of uniform temperature effect on rectangular hollow concrete pier based on measured temperature data

WU,

Chen,

Yun

et al. 2024

Preprint

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In order to accurately and easily predict the variation of the average temperature of the concrete rectangular hollow pier. Firstly, the temperature distribution of the concrete rectangular hollow pier of Changjiahe Special Bridge was observed for 212 days. Then, based on the observation data, the functional relationship between the average concrete hollow pier temperature and the outside air temperature, and the air temperature inside the hollow pier was studied. Finally, based on this functional relationship, a prediction model for the range of variation of the mean temperature of the hollow pier was given and verified. The results of the study show that: the change of external shade temperature can be regarded as the superposition of different cyclic changes and random changes; the change rule of the average temperature of the concrete hollow pier is the same as that of the air temperature, both presenting day-by-day cyclic and step changes; the linear correlation coefficients between the daily maximum and daily minimum average hollow pier temperature and the daily average air temperature are R = 0.980 and R = 0.973, respectively; the daily average air temperature, the daily average air temperature inside the pier and daily average hollow pier temperature are R = 0.980, R = 0.998; the daily variation of the average hollow pier temperature and the daily variation of the air temperature are approximately linear, with a correlation coefficient of R = 0.899; assuming that the average temperature of the concrete hollow pier is a folding change, based on the above relationship, a method of predicting the time-by-time average temperature of the concrete hollow piers is proposed, as well as two methods of predicting the average temperature of the test piers. average temperature change range method. Comparing the predicted values with the measured values, it is found that the predicted values are in good agreement with the measured values.

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“…Existing research on concrete temperature testing found that: most of the traditional temperature monitoring programs need to be pre-embedded temperature sensors in the concrete structure, although the method has the advantages of intuition, and accuracy, but can not be applied to the concrete structure in service and the lack of internal concrete temperature information [11], [12], [13]. Compared with the traditional temperature testing program, the method of predicting the change rule of concrete structure temperature by studying the longterm change relationship between the average internal temperature of the concrete structure and the external air temperature of the concrete can more accurately grasp the range of the internal temperature change of the concrete in the absence of the internal temperature information of the concrete [14], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Prediction of uniform temperature of rectangular hollow concrete pier based on measured temperature data

Chen,

Wu,

Yun

et al. 2023

Preprint

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The standard value of uniform temperature action for bridges is more loosely defined in local bridge design codes. Currently, there is an increasing tendency to determine the range of variation of uniform temperature of bridges based on air temperature information from various locations. In this study, in order to accurately and conveniently predict the range of temperature change of concrete during the design reference period. The temperature distribution of concrete rectangular hollow piers of Changjiahe Special Bridge was observed for 212 days. According to the observation data, the average temperature of the concrete hollow pier was studied as a function of the outside air temperature and the air temperature inside the hollow pier. The method of predicting the range of variation of the average concrete temperature according to the local air temperature material is proposed; the method of predicting the time-by-time uniform temperature of the concrete hollow pier based on the same temperature data inside and outside the hollow pier is proposed. The research results show that: the average temperature change rule of concrete hollow piers and air temperature, are presented day by day cycle and step change, and the hollow pier average temperature extremes appear time lagging behind the air temperature; day maximum, day minimum hollow pier average temperature and the average daily air temperature is linearly correlated between the average daily air temperature, the average daily air temperature, average daily air temperature inside the pier and the average daily hollow pier temperature is linearly correlated between the average daily air temperature and the average daily hollow pier temperature; the average temperature of the hollow pier The magnitude of change is less than the air temperature, hollow pier average temperature daily variation and air temperature daily difference is approximately linear; concrete hollow pier average temperature prediction and measured values, the maximum difference between − 1.1 ~ 0.8 ºC; in the design reference period, in the day of the highest, lowest daily average air temperature on the basis of an increase of 2 degrees Celsius, can be obtained from the range of uniform temperature changes in the bridge abutment.

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Prediction of vertical temperature gradient on concrete box-girder considering different locations in China

Cited by 8 publications

References 20 publications

Finite Element Simulation of Temperature Variations in Concrete Bridge Girders

Finite Element Simulation of Temperature Variations in Concrete Bridge Girders

Prediction of uniform temperature effect on rectangular hollow concrete pier based on measured temperature data

Prediction of uniform temperature of rectangular hollow concrete pier based on measured temperature data

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