Abstract
To study the effect of the temperature field and gradient of a steel‐concrete composite box girder bridge, a 5 × 35 continuous composite box girder bridge is used as the research object. The temperature measuring point is set by selecting a typical cross section, and the temperature change data are measured. The temperature field of the different positions in the composite box girder bridge is studied, the global and local temperature differences are compared, and the law of temperature distribution and the main factors affecting the temperature field are formulated. The most unfavourable expression function of the vertical temperature gradient of the section is simulated using the measured data, the existing standard temperature gradient mode is compared, the finite element model of the bridge is established, and the influence of the actual temperature gradient mode on the stress and deformation of the composite girder is further analysed. The conclusions show that the temperature differences of different azimuth sections and the local temperature differences between the steel and concrete joint parts of the steel‐concrete composite box girder bridge are not significant. The temperature gradient heating and cooling model fitted by the measured temperature field can be used as a reference for the structural design of similar local bridges.
Highlights
A steel-concrete composite box girder bridge is directly exposed to the environment, and the energy exchange between the bridge and the surrounding environment affects the temperature field of the composite box girder bridge [1,2,3,4,5]
In view of the above problems, this paper studies the temperature field of a steel box girder, analyses the temperature value of each measuring point, discusses the simulated temperature gradient effect, and further analyses the influence of the measured fitting temperature gradient model on the stress and deformation of the composite girder
The temperature field, temperature gradient, and effect of steel-concrete composite beam bridges of the Binhe West Road are studied, and the temperature field distribution of steel-concrete composite beam bridges is discussed: (1) In this paper, the steel-concrete composite box girder bridge is aligned in the north-south direction
Summary
A steel-concrete composite box girder bridge is directly exposed to the environment, and the energy exchange between the bridge and the surrounding environment affects the temperature field of the composite box girder bridge [1,2,3,4,5]. For bridges with steel box girders, temperature changes impact the stress and deformation of the main girder, resulting in changes in the characteristics of the whole bridge [6,7,8,9,10,11] Many factors, such as solar radiation intensity, bridge orientation, climatic conditions, materials, and bridge cross section, will affect the temperature field of composite box girder bridges [12,13,14,15,16]. Us, the temperature field of steel-concrete composite box girder bridges can be extremely complex. Erefore, further investigation of the temperature field of steel-concrete composite box girder bridges and analysis of the temperature gradient effect will provide key information for the design of steel-concrete composite box girder bridges and their maintenance during long-term service [17]. Some studies use statistical analysis techniques to predict long-term extreme
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