Vertical temperature gradient mode prediction method and device and storage medium

Abstract

The invention relates to a vertical temperature gradient mode prediction method and device and a storage medium, and the method comprises the steps: building a temperature field model of a steel box girder under the action of sunlight based on the meteorological data of a region where the steel box girder is located; correcting the temperature field model according to the actually measured temperature data to obtain a temperature field refined model; determining an extreme meteorological data representative value in a bridge design reference period of a region where the steel box girder is located; and obtaining temperature distribution of the steel box girder under the extreme meteorological condition according to the extreme meteorological data representative value and the temperature field refined model, and further fitting a vertical temperature gradient mode. The vertical temperature gradient mode of the steel box girder under the extreme meteorological condition, which is obtained based on the extreme meteorological data and the temperature field refined model corrected by the actually measured temperature data, has relatively high analysis precision, can provide a basis foraccurate calculation and analysis of the temperature effect of the steel box girder, and can also provide guidance for bridge design.

Description

technical field [0001] The invention relates to the field of temperature field analysis of steel box girders in bridge engineering, in particular to a vertical temperature gradient mode prediction method, device and storage medium. Background technique [0002] A bridge is a structure exposed to the natural environment for a long time. Under the action of sunlight (solar radiation, convective heat transfer and radiative heat transfer), the bridge structure will inevitably produce uneven temperature distribution in the vertical direction, that is, the vertical temperature gradient. For steel box girders, because steel has a large temperature expansion coefficient and is sensitive to temperature changes, the effect of vertical temperature gradient on steel box girders is more significant. The existence of internal and external constraints in the bridge structure prevents structural members from freely expanding or contracting with temperature changes, resulting in greater stre...

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Problems solved by technology

In engineering design, the problem of vertical temperature gradient of steel structure bridges under sunlight is solved by referring to the British bridge specification BS-5400, but due to the main factors affecting the temperature distribution of bridge structures such as China's meteorological and geographical environments are different from those in the UK are different, so the provisions in the BS-5400 code do not necessarily apply to steel box girders in China

In addition, my country spans multiple climatic regions, and the climates in each region are quite different. Steel box girders have various structural forms, and there are many factors that affect the temperature distribution. Therefore, on the basis of the measured temperature data, the vertical The temperature gradient model is only available for homogeneous steel box girders near the bridge site

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