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Proceedings Paper

Temperature effects on modal parameters and its experimental validation
Author(s): L. M. Sun; Z. H. Min
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Paper 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.

Paper Details

Date Published: 8 April 2010
PDF: 13 pages
Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 76502L (8 April 2010); doi: 10.1117/12.848749
Show Author Affiliations
L. M. Sun, Tongji Univ. (China)
Z. H. Min, Tongji Univ. (China)

Published in SPIE Proceedings Vol. 7650:
Health Monitoring of Structural and Biological Systems 2010
Tribikram Kundu, Editor(s)

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