Separating Temperature Effect from State Monitoring of Concrete Bridges

摘要

The structure of concrete bridge is usually large in dimension and the structural state information is heavily impacted by many complicated factors. Especially, the influence of temperature to the structural responses is very significant and this influence varies distinctly with the sun shine, sharp descent of temperature and season changing. Consequently, the existence of temperature effect will result in a greatly complicated variation of the structural responses, adding great difficulty in the effective extraction of structural health information for safety assessment of bridges. In this paper, In order to realize the effective assessment of the structural safety of concrete bridges, according to the correlating characteristic between temperature and structural response (such as strain or deflection) of the bridge, the experiential regressive equation is decided by regressive analysis of temperature and structural response, and further more the temperature effect is separated from the total response. Finally, an application example is given out for demonstration. The results indicate that the response residual after elimination of temperature effect remains only the effect ofstructural variety under loads ( including dead load and live load ), which can be used as the foundation information for structural safety assessment of concrete bridges.