基于概率密度演化的输电塔-线体系抗风可靠性分析

Reliability analysis of wind resistance of transmission tower-line system based on probability density evolution

以三线两塔直线段输电塔-线体系为工程对象,应用有限元数值模拟,建立了基于概率密度演化的输电塔-线体系抗风可靠性分析方法。首先,应用谱表示-降维方法模拟结构脉动风场,生成风荷载的代表性样本集合。然后,结合概率密度演化理论,分析了输电塔-线体系考虑气弹效应的随机动力反应。最后,应用等价极值思想构建了风荷载作用下输电塔-线体系失效准则,进而对输电塔-线体系的抗风可靠性进行精细化分析。本文结合谱表示-降维方法与概率密度演化理论,实现了仅用较少数量的代表性样本来精细地分析结构的抗风可靠性,为工程实践提供参考。

In this study,the three-line and two-tower straight section transmission tower-line system is taken as the engineering object of study,and the finite element simulation is applied to establish the wind resistance reliability analysis method of the transmission tower-line system based on probability density evolution.Firstly,the DR-SRM is used to simulate the fluctuating wind field of structures,and a representative sample set of wind load is generated.Then,combined with PDEM theory,the stochastic dynamic response of the transmission tower line system considering aeroelastic effect is analyzed.Finally,the equivalent extreme value idea is applied to construct the failure criteria of the transmission tower line system under wind load,and then the wind resistance reliability of the transmission tower line system is analyzed in detail.In this paper,by combining DR-SRM and PDEM theory,the wind resistance reliability of structures can be precisely analyzed with only a small number of representative samples,which provides a reference for engineering practice.