期刊
INTERNATIONAL JOURNAL OF STEEL STRUCTURES
卷 11, 期 2, 页码 145-155出版社
KOREAN SOC STEEL CONSTRUCTION-KSSC
DOI: 10.1007/s13296-011-2004-4
关键词
structural health monitoring; modal frequency; temperature effect; steel box girder; suspension bridge
资金
- National Natural Science Foundation of China [50725828, 50808041, 50978056]
- Ph.D. Programs Foundation of Ministry of Education of China [200802861011]
- Teaching and Research Foundation for Excellent Young Teacher of Southeast University
This paper addresses the temperature-induced variations of measured modal frequencies of steel box girder for a suspension bridge using long-tem monitoring data. The output-only modal frequency identification of the bridge is effectively carried out using the Iterative Windowed Curve-fitting Method (IWCM) in the frequency-domain. The daily and seasonal correlations of frequency-temperature are investigated in detail and the analysis results reveal that: (i) the identified modal frequencies using IWCM provide an effective indication for changes of the bridge due to the ambient temperature variations; (ii) temperature is the critical source causing modal variability, and there is an overall decrease in modal frequency with temperature for all the identified modes; (iii) the random variations in measured modal frequencies mainly arise from the identification algorithm due to the nonstationary loadings, which can be effectively eliminated using multi-sample averaging technique; (iv) the daily averaged modal frequencies of vibration modes have remarkable seasonal correlations with the daily averaged temperature and the seasonal correlation models of frequency-temperature are suitable for structural damage warning if future seasonal correlation models deviate from these normal models.
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