The long-term adverse effect caused by environmental factors is one of the main causes for performance degradation of bridges. Accurately obtaining the environmental meteorological data on the bridge site can provide basis information for analyzing and assessing the negative effects of environments on bridges. To improve the efficiency and reduce the cost of meteorological data collection, this paper proposed a method to predict the meteorological data of bridge site based on the available shared date of weather station near the concerned bridge. Focusing on bridge temperature effects in this study, two major meteorological parameters, air temperature and wind speed, are investigated for data predication. Meanwhile, different geomorphologic conditions at different regionsin China are discussed. Four interpolation methods, inverse distance weighting, Kriging interpolation, radial basis function, and minimum curvature method, are investigated. Cross-validation has been used to evaluate the performance of these four methods. The results show that Kriging method has the best predication on air temperature, and the inverse distance weighted method and Kriging method are both good for wind speed, however, Kriging shows better performance as a whole. Spatial interpolation method is feasible to predicate the meteorological parameters of bridge site, which provides a higher efficiency and less cost approach to obtaining the on-site meteorological data for the bridge temperature effects analysis and assessment.
Temperature has significantly negative effect on structural performance, this situation is sure to be even worse for support structure of offshore wind turbine (OWT) in harsh ocean environment. In this study, the daily temperature effects on a support structure of jacket-type OWT are investigated using numerical simulation. The basic theory and method of thermal analysis for structure are briefly introduced. The finite element (FE) models for thermal analysis of the support structure of an OWT are constructed. Then, the time-dependent thermal boundary conditions are determined using the meteorological parameters of a typical sunny day. Accordingly, the thermal boundary conditions are applied on the FE model. Subsequently, the transient heat-transfer analysis is performed for structural temperature calculation. At last, the time-dependent structural temperature variation and distribution of the support structure are discussed. The results show that the temperature effects are considerable and have obvious daily-cycle property. The solar radiation and air temperature are the major influential factors on the structural temperature behavior of the steel tube tower. The temperature effects should be seriously considered in the design and maintenance of the support structure of OWT.
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