基于气象数据的桥梁结构温度作用研究

针对桥梁结构温度作用计算中的实测数据缺失问题,提出了基于日辐射总量、日气温和日平均风速等气象数据进行桥梁结构温度作用分析的方法。运用该方法建立了某混凝土箱梁桥的有限元模型,结果表明该方法可在缺乏实测数据时有效分析桥梁结构的温度作用;箱梁顶板温度与气温的时程曲线变化趋势相似,且顶板温度变化幅度更大但相对滞后;截面均匀温度同样呈现出滞后于气温变化的周期性波动;箱梁截面竖向温度梯度与新西兰规范中的温度作用模式吻合最好。

Research on Temperature Effect of Bridge Structure Based on Meteorological Data

Considering the problem of missing measured data during the calculation of bridge structure temperature effect,an analysis method of bridge structure temperature effect based on meteorological data,including total daily radiation,daily temperature,daily average wind speed and so on,was proposed.The finite element model of a concrete box girder bridge was established by using this analysis method.The results show that the proposed method can be used to analyze the temperature action of bridges when measured data is lacked.Temperature history curve of top plate of concrete box-beam is similar to the air temperature history curve,and the change of the former is larger than but behind the latter.The uniform temperature of the section also shows periodic fluctuation lagging behind the temperature change.The vertical temperature gradient model of the concrete box girder fits the vertical temperature gradient model in the New Zealand Code very well.