[1]MENG Fanbao,GE Hongkui,CHEN Haichao,et al.Response Characteristic of Bridge Structural under Natural Loads Detected by Using Three-component Seismometer[J].Journal of Seismological Research,2016,39(03):519-525.
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Response Characteristic of Bridge Structural under Natural Loads Detected by Using Three-component Seismometer
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
39
Number of periods:
2016 03
Page number:
519-525
Column:
Public date:
2016-07-23
- Title:
- Response Characteristic of Bridge Structural under Natural Loads Detected by Using Three-component Seismometer
- Keywords:
- bridge structural response; ambient vibrating signal; spectrum characteristic; modal analysis
- CLC:
- V442
- DOI:
- -
- Abstract:
- We developed a set of bridge structural response online detection system based on ambient vibrating signal, and used high-sensitivity three-component broadband seismometer(CMG-6TD)to continuously monitor the tiny ambient vibrating signal of four typical in-service bridges in Beijing which was under the natural loading. Then we obtained the spectrum characteristic and structural response characteristic of four typical in-service bridges in different direction by the peak amplitude method and cross-correlation function technique respectively. The results show that:(1)The three-component broadband seismometer can continuously record accurate, reliable and tiny ambient vibrating signal in broadband range, and thus, which is extremely suitable for establishing a bridge structural response online detection system.(2)Both peak amplitude method and noise cross-correlation function technique can identify the modal frequencies of multi-step bridges, and the identification result obtained by the noise cross-correlation function technique is more stable.(3)The modal frequency of the bridge are influenced by many factors, such as the bridge structure, materials and ambient temperature etc.. As a consequence, the natural vibration frequencies of bridge are all different in vertical and the horizontal directions. Moreover, the structural responses of different type of bridge also show distinct difference.The develeping bridge structural response detection technology could be the basis of the real-time health of the exciting bridge.
- References:
- -
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Last Update:
1900-01-01