基于模糊性能水准的输电塔线体系抗风可靠性研究

Research on Wind Resistance Reliability of Transmission Tower-line System Based on Fuzzy Performance Level

研究基于模糊性能水准的输电塔线体系抗风可靠度问题。首先建立了输电塔线体系的等效随机静风荷载模型,进一步分别建立了基于传统性能水准的结构功能函数和基于模糊性能水准的结构功能函数。采用不同类型隶属函数描述了输电杆塔结构的模糊性,建立了输电塔线体系模糊可靠度和失效概率的分析计算方法。以南部沿海地区的某大跨度输电线路为实际工程背景,研究了结构的抗风可靠性问题。通过参数研究考察了模糊性系数和隶属函数形式对结构抗风可靠性的影响,为其抗风设计提供参考。

The reliability of wind excited transmission tower-line system based on fuzzy performance level was actively investigated.The equivalent random static wind loads of tower-line systems were established firstly.Furthermore,the structural performance functions based on traditional performance levels and fuzzy performance levels were developed,respectively.Different types of membership functions were utilized to describe the structural fuzziness.A method for calculating the fuzzy reliability and failure probability of transmission tower-line systems was proposed.A real tower-line system in southern areas was taken as an example to explore the structural wind resistance reliability based on fuzzy performance level.The effects of fuzziness coefficient and membership function on the wind resistance reliability of structures were investigated through parameter research,providing reference for the structural wind resistance design.