Effect Analysis of Environmental Factors on Structural Modal Parameters of Cable-stayed Bridge

MIN Zhihua;SUN Limin;DAN Danhui;SUN Zhi

Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (10) : 99-105.

PDF(4241 KB)
PDF(4241 KB)
Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (10) : 99-105.
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Effect Analysis of Environmental Factors on Structural Modal Parameters of Cable-stayed Bridge

  • MIN Zhihua1;SUN Limin1;DAN Danhui1;SUN Zhi1
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Abstract

Influenced by some environmental factors (such as temperature, traffic loads, wind and rainfall etc.), dynamic properties of bridge system would change. In this paper, one year monitoring data of the main navigation channel bridge of Donghai Bridge were analyzed and some statistical results were presented. Based on coherence analysis and correlation analysis, the main environmental factors affecting structural modal parameters, were confirmed. It is showed that the temperature and structure vibration magnitude are two main influencing factors on the variation of bridge modal frequency. The structural modal parameters were significantly affected by wind only when the wind speed was high enough. Moreover, the analysis results showed that these three factors affect structural dynamic properties in different time scale: the temperature change is accountable for yearly variation of bridge modal parameters, the acceleration RMS(root mean square), which indicates the structural vibration magnitudes, is accountable for their weekly variations and the wind affects structural modal parameters in transient strong wind term. Finally, the mechanism of environmental effects on frequency variation was discussed based on above analyzing result.

Key words

Structural Health Monitoring / Modal Parameters Variation / Environmental Effect / Cable-stayed Bridge

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MIN Zhihua;SUN Limin;DAN Danhui;SUN Zhi . Effect Analysis of Environmental Factors on Structural Modal Parameters of Cable-stayed Bridge [J]. Journal of Vibration and Shock, 2009, 28(10): 99-105
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