CONDITION ASSESSMENT OF STAY CABLES BASED ON STRUCTURAL HEALTH MONITORING TECHNIQUES
Structural health monitoring (SHM) system provides an efficient way to the diagnosis and prognosis of critical and large-scale civil infrastructures like long-span bridges. This paper presents a long-term condition assessment approach of cables under inservice loads based on SHM technique. For the cables of the bridge,the stochastic axial force response can be collected by the SHM system and described by a filtered Poisson process,through which the maximum value distribution of axial ?forces in its design reference period can be derived using Poisson Process theory. The long-term deterioration process of steel wires in the cables considers simultaneously the uniform and pitting corrosion due to environmental attack and the fatigue propagation induced by cyclic stress. By employing first order reliability method,the reliability of the cables under the monitored responses is further estimated in terms of the safety under the extreme traffic load distribution in the design reference period and the serviceability specified in the design specification.The discussions of the life-cycle condition assessment of the cable stayed bridge provide guidance to the future decision making related to maintenance and replacement,and it may also shed light on the long-term condition assessment of other structures.
Condition assessment Stay cables Structural monitoring Reliability analysis
Shun-Long Li Hui Li Song-Ye Zhu
School of Transportation Science and Engineering,Harbin Institue of Technology,Harbin 150090,P.R. Ch Department of Civil and Structural Engineering,The Hong Kong Polytechnic University,Hong Kong 999077
国际会议
The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)
广州
英文
1131-1136
2010-12-01（万方平台首次上网日期，不代表论文的发表时间）