Correlation analysis between structure temperature and deflection of a suspension bridge girder
LI Ming1 ZHONG Ji-wei1,2 YAN Feng3
1. Major Bridge Science Research Institute Co. Ltd., China Railway Major Bridge Engineering Group, Wuhan 430034, China；
2. State Key Lab for Health and Safety of Bridge Structures, Wuhan 430034, China；
3. Yangzi River Spatial Information Technology Engineering Co. Ltd., Wuhan 430010, China
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.
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. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(11): 237-245.
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