Application of improved Bayesian method in bridge state assessment(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年06期
- Page:
- 47-53
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Application of improved Bayesian method in bridge state assessment
- Author(s):
- LIU Lai-jun; WU Duo; ZHANG Xia; XUE Cheng-feng; LI Xiao
- School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China
- Keywords:
- bridge engineering; Bayesian theory; state information; evaluation index; bridge assessment
- PACS:
- U448.21
- DOI:
- -
- Abstract:
- To more effectively make an accurate assessment of bridge state, based on the theory of analytic hierarchy process (AHP) in existing system, the whole bridge was decomposed hierarchically according to its different parts and functions, and each sub-component was converted into a node in Bayesian probability network. Therefore, the state score of each sub-component was set to be corresponding to the state probability of Bayesian network node, and then the whole state of bridge at a certain time was determined. At the same time, combined with time-varying effect and based on Bayesian inference which considered the influence of the prior information, a complete assessment system was established in chronological order by updating, transmitting and evaluating the state information of bridge at different moments, and a bridge state evaluation method based on Bayesian theory was proposed. Through the evaluation example of a bridge, the state probability distribution of bridge assessed in different years was analyzed. The results show that the probability of the corresponding state level in different years has been improved significantly after training with the improved Bayesian method, and the assessment accuracy has been increased from 50% or 60% to 95%; by comparing the probability distribution curves of bridge state level in different years, the main enveloping region level of the curve shows a decreasing trend with the increase of operating time, indicating that a cumulative damage is produced during the operation of bridge, and the corresponding state level shows a descending trend. Meanwhile, the probability corresponding to the highest point of the curve presents an increasing trend, indicating that the use of this method to evaluate bridge is more intuitive and reliable, and the evaluation results are more in line with the actual situation.
Last Update: 2017-12-18