Solar radiation temperature effect analysis method and system of civil engineering structure

Abstract

The invention discloses a solar radiation temperature effect analysis method and system of a civil engineering structure. The method comprises the following steps: a geographical longitude and a latitude of a position where the structure is disposed are determined, and through installing a sensing apparatus on the structure, an ambient air temperature and a surface wind speed of the structure are measured. By use of a structure solar radiation model, direct radiation intensity, scattering intensity and reflection intensity acting on the surface of the structure are calculated and determined. According to solar radiation intensity of the structure surface, dynamic temperature boundary conditions are established, by use of a finite-element method, a three-dimensional thermal conduction equation of the structure is solved, and a dynamic temperature effect of any one point at the surface of the civil engineering structure or inside the structure can be determined. The method and system are applied to temperature effect analysis and evaluation of various different types of civil engineering structures under a solar radiation effect, and are particularly applied to analysis evaluation of a temperature effect of a structure with a quite small geometric dimension and a structure with complex shielding around.

Description

technical field [0001] The invention relates to a temperature effect evaluation technology, in particular to a method and system for analyzing the solar radiation temperature effect of a civil engineering structure. Background technique [0002] Civil engineering structures serve in the open air for a long time, and inevitably bear the effects of external loads and natural environments. Under the influence of environmental factors such as solar radiation and temperature changes, the structure will cause uneven and nonlinear temperature distribution, resulting in obvious temperature-induced effects. Researches at home and abroad have shown that strong time-varying temperature loads will lead to very serious temperature-induced effects: for example, the frequency change of a long-span bridge structure due to time-varying temperature within a day can be as high as 5%. Under strong temperature loads, civil engineering structures can easily cause a strong nonlinear time-varying ...

AI Technical Summary

Problems solved by technology

At present, the understanding of the mechanism of the solar radiation temperature effect of civil engineering structures is relatively simple, and the analysis and evaluation methods and means are still very scarce, which directly leads to large errors in the calculation of the structural temperature load and the calculation of the temperature effect. The existing solar radiation based on traditional astronomy There are often large differences between the model results and the measured results, which are difficult to match

Existing methods do not consider the influence of structural service environment factors such as humidity, wind speed, environmental shading, structural self-shading, etc., and there is a lack of relevant research on basic scientific issues of temperature load models and time-varying temperature effects from the perspective of mechanism

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