Temperature effects on modal parameters and its experimental validation

L. M. Sun; Z. H. Min

doi:10.1117/12.848749

8 April 2010 Temperature effects on modal parameters and its experimental validation

L. M. Sun, Z. H. Min

Proceedings Volume 7650, Health Monitoring of Structural and Biological Systems 2010; 76502L (2010) https://doi.org/10.1117/12.848749
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Based on one year monitoring data of a cable-stayed bridge, it was found that the environmental temperature was one of principal environmental factors effecting structural modal parameters in long-term. The possible mechanism is due to the influences of environmental temperature on structurel material properties, such as modulus of elasticity, and structural geometry properties, such as boundary conditions. In this paper, the distribution of environmental temperature was analyzed based on the long-term monitoring data of a cable-stayed bridge. It was found that the distribution of structural temperature was consistent in longitudinal direction of the bridge and the structural temperature gradients in bridge box girder section obeyed non-Gaussian distribution. The influencing mechanism of environmental temperature on dynamic properties was theoretically analyszied and was validated based on the monitoring data. The results demonstrated that the theoretical analysis was consistent with the monitoring data. And then the effect of temperature on modal parameters was analyzed by Auto-Regressive model with eXogenous inputs (ARX) model based on the monitoring data. It was found that there was obvious time lags in the environmental temperature effects on the modal parameters and the time lag could be equivalently evaluated by multi-point temperature data. Finally, the effects of environmental temperature on modal parameters were validated by a model experiment, and the results were consistent well with that of the monitoring data.

Citation Download Citation

L. M. Sun and Z. H. Min "Temperature effects on modal parameters and its experimental validation", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76502L (8 April 2010); https://doi.org/10.1117/12.848749

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