结构温度与悬索桥主梁挠度的关联性分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (11) : 237-245.

论文

结构温度与悬索桥主梁挠度的关联性分析

李明1，钟继卫1,2，严凤3

作者信息 +

Correlation analysis between structure temperature and deflection of a suspension bridge girder

LI Ming1 ZHONG Ji-wei1,2 YAN Feng3

Author information +

文章历史 +

摘要

温度是桥梁的重要环境荷载，主梁挠度是悬索桥整体响应的一项重要指标，主梁挠度和结构局部温度间为高度非线性关系。两者的功率谱表明挠度长期趋势主要受温度影响，利用EMD方法可将挠度温度效应从挠度时程中分离出来。温度上升与下降阶段的挠度温度效应的比较结果显示，挠度温度效应不仅与局部位置的当前温度有关，还与这些位置的温度历程有关。以结构温度为输入、挠度温度效应为输出，建立支持向量回归模型（SVR model），计入温度历程影响的模型比只考虑当前温度的模型能更好地描述结构局部温度与挠度温度效应间的非线性关系，该模型精度较高、泛化性能较好。利用温度历程和SVR模型可方便地计算挠度温度效应，该方法具有一定的工程应用价值。

Abstract

For large-span suspension bridges, temperature is an important environmental load and their girder deflection is an important index of their whole responses. The relationship between them is highly nonlinear. The power spectra of temperature and girder deflection reveal that the long-term trend of the deflection is mainly affected by temperature. The deflection’s temperature effect can be separated from the deflection time history with the EMD method. The comparison between the deflection’s temperature effect in the stage of temperature rising and that in the stage of temperature dropping shows that the deflection’s temperature effect is related to not only the current temperature of local positions but also the temperature time history of these positions. Here, SVR model was built taking structure temperature as input and the deflection’s temperature effect as output. The simulation results showed that the SVR model considering the effects of temperature time history can better describe the complicated nonlinear relationship between the structure’s local temperature and the deflection’s temperature effect compared with the SVR one only considering the current temperature; the former has a higher accuracy and a better generalization performance; temperature time history and SVR model can be used to easily calculate the deflection’s temperature effect; this method has a certain engineering application value.

导出引用

李明1，钟继卫1,2，严凤3. 结构温度与悬索桥主梁挠度的关联性分析[J]. 振动与冲击, 2018, 37(11): 237-245

LI Ming1 ZHONG Ji-wei1,2 YAN Feng3. Correlation analysis between structure temperature and deflection of a suspension bridge girder[J]. Journal of Vibration and Shock, 2018, 37(11): 237-245

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