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Detection of Tension Loss in Cables of Cable-Stayed Bridges by Distributed Monitoring of Bridge Deck Strains
| 题名： | Detection of Tension Loss in Cables of Cable-Stayed Bridges by Distributed Monitoring of Bridge Deck Strains |
| 正文语种： | 英文 |
| 作者： | Ebrahim Nazarian;Farhad Ansari, M.ASCE;Xiaotan Zhang;Todd Taylor |
| 作者单位： | Univ, of Illinois |
| 关键词： | Cable-stayed bridges; Fiber Bragg gratings (FBG); Brillouin optical time domain (BOTDA); Distributed strain; Tension loss; Damage detection; Least squares; Stay cables; Structural health monitoring. |
| 摘要： | Development of a simplified approach for monitoring the cables of cable-stayed bridges is described in this article. The method introduced in this paper uses the distributed measurement of strains along the bridge deck to detect the cables that have totally or partially lost their tensile force. The fundamental principle employed in formulating the method is the interrelationship between the individual cable forces and the bending moment along the bridge span. The proposed method was evaluated through an experimental program that involved fabrication and testing of a reduced scale model of a single plane cable-stayed bridge. Distributed strain along the span length was monitored by a Brillouin Optical (Neubrex, Hyogo, Japan) Time Domain Analysis fiber optic sensor system. Strain gauges, Fiber Bragg Grating sensors (Technica Optical Component, LLC, Beijing, China), and a finite element model of the bridge were employed for evaluating the efficiency of the proposed method. Several different damage cases were considered in the experiments, including single and multiple cable tension loss scenarios. Experimental results revealed that it was possible to detect the cables that had experienced tension losses of 30% or more. DOI: 10.106l/(ASCE)ST.1943-541X.0001463. © 2016 American Society of Civil Engineers. |
| 出版日期： | 2016.06 |
| 出版年： | 2016 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.142 |
| 期： | NO.06 |
| 页码： | 04016018 |
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