TEMPERATURE EFFECT ON VERTICAL DEFLECTIONS OF A SUSPENSION BRIDGE

초록

Automatic measurement of instrumented civil engineering structures is now widely applied for behavior monitoring during construction in field as well as long-term monitoring for lifetime assessment of bridge structures. This paper presents the structural health monitoring system installed in Yeongjong Bridge briefly, and analysis results of deflection responses measured for about 14 months from Jan. 2001. The measured field data indicate that the behavior of the bridge is closely related to daily and annual fluctuation of ambient temperature. Thus, a mathematical model between the temperature and the deflection responses is constructed using the ARX model, a statistical time series analysis method. The constructed ARX model can be utilized for detection of abnormal behavior with additional statistical process control analysis. This model can also provide useful data for analysis of vehicle load effect by eliminating daily and seasonal fluctuation."