Temperature Effect Separation Method of Deflection Monitoring of
Prestressed Concrete Girder Bridge
WU Haijun1,2, HE Li1, WEI Yue3
(1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
3. Jiangsu TS Traffic Design and Research Institute Co., Ltd., Nanjing 223001, Jiangsu,China)
Abstract：In large span girder bridge, the deflection value caused by temperature accounts for a large proportion in the measured total deflection value of the structure, which has an impact on the safety evaluation of the real bridge. Aiming at this phenomenon, a practical separation method of temperature effect in bridge deflection monitoring was proposed by using the idea of linear regression. Taking Jiangjin Yangtze River Bridge as the engineering background, a linear regression model was established to fit the regression linear equation to achieve the purpose of separating temperature effect, with the temperature monitoring value as independent variable and deflection monitoring value as response variable. The results show that the relationship between the mid-span deflection change and the temperature change is positive. There is a significant linear relationship between the temperature change inside the box girder and the mid-span deflection change. The temperature effect can be separated by deducting the temperature effect fitting value calculated by the fitting linear equation from the measured value.The daily operation of the bridge can be effectively monitored by using the residual value and setting the corresponding threshold.
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2020, Vol. 39 
