Temperature variation in steel box girders of cable-stayed bridges during construction

Kim, Sang Hyo; Park, Sejun; Wu, Jiaxu; Won, Jeong-Hun

doi:10.1016/j.jcsr.2015.04.016

Cited by 57 publications

(26 citation statements)

References 20 publications

(33 reference statements)

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“…Zhang et al (2011) found that the vertical temperature difference was larger than the values provided by BSI (BS 5400-2:2006, 2006) for a flat steel box girder without pavement (width-to-depth ratio = 11.8) through heat-transfer analysis. Kim et al (2015) also used heat-transfer analysis to investigate the temperature distribution of a flat steel box girder (width-to-depth ratio = 11) during construction. Despite its importance, transverse temperature difference was not covered in existing studies due to the limited available data.…”

Section: Introductionmentioning

confidence: 99%

Investigation of temperature actions on flat steel box girders of long-span bridges with temperature monitoring data

Deng

Yang

et al. 2018

Advances in Structural Engineering

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The worldwide application of streamlined flat steel box girder on long-span bridges calls for more knowledge of its temperature distribution. The rapid development of structural health monitoring techniques offers a great opportunity to address this issue. A comprehensive approach of installing monitoring equipment, collecting data, and applying long-term temperature monitoring data to study the temperature distribution of flat steel box girders is developed. As demonstrated through the analysis of 1-year data of a suspension bridge, first, a mapping relation between effective temperature and ambient air temperature is established. Such a relation enables identifying the optimal time to finally join the flat steel box girders at the designed effective temperature based on the easy-to-obtain ambient air temperature. Second, the cycling variation of effective temperature is presented to provide information for design and assessment of expansion joints and bearings, including not only the maximum design displacements but also cumulative displacements related to the long-term durability and remaining life of expansion joints and bearings. Finally, both vertical and transverse temperature gradients are studied to provide some new insights about the temperature characteristics of flat steel box girders. The study suggests that the transverse and vertical temperature gradients should be applied to the bridge cross section individually since the data analysis supports that the two gradients are independent.

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Section: Introductionmentioning

confidence: 99%

Investigation of temperature actions on flat steel box girders of long-span bridges with temperature monitoring data

Deng

Yang

et al. 2018

Advances in Structural Engineering

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“…This kind of heating process by convective heating ensures a uniform temperature distribution within the girder section. In addition, the authors' previous research for the temperature distribution of a steel box girder in a cable-stayed bridge showed that the temperature of the inner steel box is even at dawn [9]. From the temperature distribution results, a heating schedule can be determined.…”

Section: New Key Segment Closing Methodsmentioning

confidence: 99%

Structural Behavior of a Long-Span Partially Earth-Anchored Cable-Stayed Bridge during Installation of a Key Segment by Thermal Prestressing

Kim

Won

2016

Applied Sciences

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This study investigated structural behavior of long-span partially earth-anchored cable-stayed bridges with a main span length of 810 m that use a new key segment closing method based on a thermal prestressing technique. A detailed construction sequence analysis matched with the free cantilever method (FCM) was performed using a three-dimensional finite element (FE) model of a partially earth-anchored cable-stayed bridge. The new method offers an effective way of connecting key segments by avoiding large movements resulting from the removal of the longitudinal restraint owing to the asymmetry of axial forces in the girders near the pylons. The new method develops new member forces through the process of heating the cantilever system before installing the key segment and cooling the system continuously after installing key segments. The resulting forces developed by the thermal process enhance the structural behavior of partially earth-anchored cable-stayed bridges owing to decreased axial forces in the girders.

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“…Before conducting the structural temperature field and temperature effect analysis, an additional 48-h analysis step was added to eliminate the temperature field error at the initial moment of the steel-concrete composite bridge deck system. 18,19 The finite element calculation results were verified using the data collected by the health monitoring system. According to Saint Venant's principle, three standard internode lengths of stiffened beam segments in the main span were selected along the length direction, and the FEM was established using ABAQUS, as shown in Figure 2.…”

Section: Fem Model Based On the Heat Transfer Principlementioning

confidence: 96%

Study on the life cycle simulation method of the temperature field and temperature effect of a steel–concrete composite bridge deck system

Xiang

Wang

Liu

et al. 2021

Measurement and Control

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Traditional theoretical calculations, field measurements, and finite element methods sometimes fail to realize life cycle simulations of the temperature field and temperature effect of steel–concrete composite bridge deck systems. In this paper, a simulation method based on a back propagation–long short-term memory (BP-LSTM) network correlation model is proposed to predict the temperature field and temperature effect in a low-cost and highly efficient manner. A bridge was used as the engineering background according to a health monitoring system, and the finite element method based on the principle of heat transfer was used to expand the data sets. Data sets with structural, time, and environmental characteristics as the independent variables and temperature and the temperature effect as the dependent variables were formed. The correlation between the dependent and independent variables was verified using the maximal information coefficient. Thus, the BP-LSTM model was established, and the mean squared error loss function considering the time weight was designed. The data set was read in for training, verification, and testing, and a correlation model representing the relationship between the set’s independent and dependent variables was obtained with relatively high accuracy. Finally, combined with the bridge’s historical meteorological data, the established correlation model was used to simulate the bridge’s temperature field and temperature effect. The results indicated that the finite element calculation results of the structure’s temperature field based on the heat transfer principle were basically consistent with the measured results. The independent variables in the data set were non-linearly related to the dependent variables. The BP-LSTM’s prediction accuracy of the temperature field and temperature effect was above 98.8% and 94.5%, respectively, in good agreement with the target value. The variation law of the temperature field and temperature effect of the steel–concrete composite bridge deck system simulated by combining the historical meteorological statistics was in accordance with reality.

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Temperature variation in steel box girders of cable-stayed bridges during construction

Cited by 57 publications

References 20 publications

Investigation of temperature actions on flat steel box girders of long-span bridges with temperature monitoring data

Investigation of temperature actions on flat steel box girders of long-span bridges with temperature monitoring data

Structural Behavior of a Long-Span Partially Earth-Anchored Cable-Stayed Bridge during Installation of a Key Segment by Thermal Prestressing

Study on the life cycle simulation method of the temperature field and temperature effect of a steel–concrete composite bridge deck system

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