Investigation of Non-uniform Temperature Field of Composite Box-girders with Corrugated Steel Webs Under Solar Radiation
Bridge structures are exposed to complex natural environments and directly subjected to fluctuations in the air temperature and solar radiation.The impact of the surrounding environmental factors results in a significantly non-uniform temperature distribution in the structures.In this study,an experimental investigation was conducted to obtain a comprehensive understanding of the nonuniform temperature field of a composite box girder with corrugated steel webs and to reveal its time-varying and spatial distribution characteristics.The same temperature variations were used at all measurement points,which is consistent with the air temperature conditions.According to the experimental results,a nonuniform temperature field occurs in the composite box girder with corrugated steel webs,and the daily maximum vertical temperature gradient along the north and south webs is 12.8 ℃ and 12.1 ℃,respectively.Subsequently,a finite element method simulation model of the experimental composite box girder was established and validated using the measured temperature data.The obtained average absolute errors of the measurement points generally range from 0.6 ℃ to 1.5 ℃,and the maximum absolute errors are less than 3.6 ℃.Based on a model of the environmental parameters and numerical simulation,the long-term temperature variation in the actual composite box girder with corrugated steel webs was continuously simulated.The long-term simulation indicates that the extreme vertical temperature gradients along the south and north webs are 35.6 ℃ and 27.8 ℃,respectively,which exceed the vertical temperature gradient given in the current composite bridge design code.Therefore,this study can be used as a reference for the structural design and further engineering applications of composite box girders with corrugated steel webs.
bridge engineeringnon-uniform temperature fieldexperimental investigationcom-posite box-girdercorrugated steel webnumerical simulation
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