Effect Analysis of Environmental Factors on Structural Modal Parameters of Cable-stayed Bridge
MIN Zhihua1;SUN Limin1;DAN Danhui1;SUN Zhi1
Author information+
1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
{{custom_zuoZheDiZhi}}
{{custom_authorNodes}}
{{custom_bio.content}}
{{custom_bio.content}}
{{custom_authorNodes}}
Show less
History+
Received
Revised
Published
2008-10-10
2008-12-30
2009-10-28
Issue Date
2009-10-28
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.
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