Abstract
Safety Grade Evaluation of Aqueduct Structure Based on Fuzzy Cloud Theory Analysis
Highlights
In long-distance water transportation projects, aqueducts are commonly used cross-ditch buildings
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
Summary
In long-distance water transportation projects, aqueducts are commonly used cross-ditch buildings. Among the 402 large-scale irrigation districts built in the 1970s and 1980s in China, the aqueduct structure was a widely adopted and indispensable type of water delivery structure [1] These buildings have been in service for a long time under the influence of complex environmental media. Sun Bo & Xiao Rucheng [4] introduced fuzzy mathematics into the analytic hierarchy process and combined the advantages of the two to evaluate the safety level of bridge engineering This method fails to comprehensively consider the randomness and uncertainty between the influence factor data. This paper selects the 5#U-type aqueduct structure of the main canal in Jingdian Irrigation District of Gansu Province, China, as the research object It is carried out in five aspects, the multi-level decomposition of structural form, seismic performance, bearing capacity, service status and durability defects. Since the water conservancy industry has not issued normative evaluation standards and assessment criteria for aqueduct structures, considering that the water conveyance aqueduct is similar in structure and function to road and bridge structures, this paper refers to "the standard of the safety assessment method of bridge engineering and the assessment of highway bridge technical status. (JTG/T H21-2011)" to evaluate the service safety of the aqueduct structure
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