Original scientific paper

https://doi.org/10.17559/TV-20191220131402

Safety Grade Evaluation of Aqueduct Structure Based on Fuzzy Cloud Theory Analysis

Yu Cheng ; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
Zhengzhong Wang ; Institute of Water Engineering Safety Research in Arid and Cold Region, Northwest A&F University, Yangling 712100, Shaanxi, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
Cundong Xu ; School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; Henan Provincial Hydraulic Structure Safety Engineering Research Center, Zhengzhou 450046, China
Hui Cheng ; China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Xinglin Zhu ; School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China

Abstract

In view of the limitation of natural conversion between qualitative concept and quantitative value, the fuzzy analysis method cannot be employed to improve the multi-stage fuzzy evaluation method. Improvement of multilevel fuzzy evaluation method based on cloud theory was found, which could comprehensively consider the uncertainty of random combinations and the fuzziness of interaction between influencing factors, and the shortcomings of conventional fuzzy evaluation methods as well eliminated. The structure of 5#U-aqueduct in Jingdian Irrigation District (Gansu, China) was chosen as the research object. Based on the multi-level fuzzy evaluation index system of structural safety, experts were invited to score the importance of factors according to the cloud theory scale criterion to establish a judgment matrix. Therefore, the evaluation set, weight and membership cloud model of evaluation system was constituted by means of bridge safety assessment criterion and cloud generator principle. Furthermore, comprehensive evaluation results of aqueduct service states were obtained by multistage fuzzy composite mapping method, and the actual position of structural safety grade was obtained by comparing the evaluation result with the comment layer cloud drop diagram. The results showed that using cloud model parameters (Ex, En and He) to describe the relative importance of factors can better reflect the randomness and fuzziness of each other than the traditional single number, which was helpful to get the evaluation results accurately and objectively; The comprehensive evaluation results of the aqueduct structure obtained by calculation were WV(75.149, 9.95, 4.16).The simulated cloud droplet diagram was located between II and III classes, and tends to the III standard, which indicated that the overall security of the structure was sufferable. However, attention should be paid to the maintenance and repair of the detailed components. The consequences agreed with the evaluation results of the experts, which indicates that the improved evaluation method has good practicability as well as can be popularized and applied.

Keywords

aqueduct; cloud generator; cloud theory; comment set; membership degree; multistage fuzzy evaluation; safety condition; weight

Hrčak ID:

239097

URI

https://hrcak.srce.hr/239097

Publication date:

14.6.2020.

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