输电直线杆塔风灾易损性的准静态分析方法  

Wind Hazard Fragility Analysis of Transmission Free-standing Towers Using Quasi-static Method

作　　者：何浩林 汪大海[1] 黄增浩 张志强 HE Haolin;WANG Dahai;HUANG Zenghao;ZHANG Zhiqiang(College of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,Hubei Province,China;CSG Electric Power Research Institute Co.,Ltd.,Guangzhou 510663,Guangdong Province,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北省武汉市430070 [2]南方电网科学研究院有限责任公司,广东省广州市510663

出　　处：《中国电机工程学报》2024年第9期3732-3741,I0034,共11页Proceedings of the CSEE

摘　　要：如何合理并高效地评估既有输电杆塔的抗风承载性能及安全裕度,对电网的风灾预测及运维管理具有重要的意义。该文提出一种考虑风向效应杆塔结构易损性评估的高效实用方法。首先基于风工程原理,采用准静态分析框架推导给出不同设计风速下的杆塔整体风荷载的极值概率分布;随后综合考虑输电塔结构参数的不确定性及初始缺陷,通过非线性静力推覆分析(nonlinear static pushover analysis,NSPA)考察杆塔结构的抗风承载能力性能及对应的破坏准则;进而依据随机抽样分析得到杆塔结构的抗风承载力的概率模型;最后采用极限状态函数计算不同风向角下的杆塔风灾易损性概率曲线。研究表明,基于首次超越概率理论可以方便得到准静态分析框架下的整体风效应概率分布;准静态的基底剪力响应不受结构非线性状态影响,可作为整体风荷载作用的评价指标;基于构件屈服破坏与整体破坏内在联系,可建立合理的轻微、严重和倒塌的破坏准则;风向角对杆塔的抗风承载性能和易损性均有着显著影响,杆塔在60°风向角下的易损概率最高。It is significant to understand the wind disaster prediction and operations management so as to evaluate the wind resistance bearing performance and safety margin on existing transmission tower.In this paper,an effective method of tower fragility considering varies wind direction is carried out.Firstly,based on the principle of wind engineering,a quasi-static analysis framework is applied to determine the extreme probability distribution of wind load of tower under different design wind speeds.The uncertainty and initial defects of structure,which include wind bearing capacity performance and corresponding failure criterion of tower structure are investigated later by using nonlinear static pushover analysis(NSPA).The next step is obtaining the probability model of the wind bearing capacity of structure using random sampling analysis,and finally the wind disaster fragility curve of the tower under different wind direction can be calculated by using limit state function.This study shows that:1)the probability distribution of wind effect based on quasi-static analysis framework can be obtained by using the first transcendental probability theory.2)On the other hand,the quasi-static base shear response is not affected by the nonlinear status of the structure,and can be used as an evaluation indicator of the overall wind load.3)Based on the internal relationship between yield failure and overall failure,a reasonable failure criterion of slight,severe and collapse can be established.4)The wind angle has a significant influence of the wind bearing capacity and the tower vulnerability.In this paper,the tower has the highest vulnerability probability under the wind angle of 60°.

关 键 词：输电杆塔 风向角 非线性静力推覆分析 破坏准则 易损性 

分 类 号：TM726[电气工程—电力系统及自动化]