中小跨度预应力柔性光伏支架风振响应分析及风振系数取值研究  

Wind Vibration Response Analysis and Wind Vibration Coefficient Value Study of Small and Medium-span Prestressed Flexible Photovoltaic Supports

作　　者：杨光 左得奇 侯克让 傅强 何利君 YANG Guang;ZUO Deqi;HOU Kerang;FU Qiang;HE Lijun(Southwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Chengdu 610021,China)

机构地区：[1]中国电力工程顾问集团西南电力设计院有限公司,四川成都610021

出　　处：《电力勘测设计》2023年第5期28-33,43,共7页Electric Power Survey & Design

摘　　要：基于Davenport谱,利用AR法对中小跨度柔性支架进行了风振响应及风振系数取值分析。通过改变主索预紧力、风速大小、索直径等参数,得到中小跨度柔性支架的位移、索拉力风振响应规律,并利用等效力法计算出结构的风振系数。研究结果表明:增大索预紧力对结构位移风振响应的影响较小,但可以减小索拉力的风振响应,在设计时,建议按索拉力为指标计算索的风振系数;风速变化对柔性支架结构的风振响应影响呈波动变化趋势,在计算风振系数时应考虑各风速下的结构风振响应波动变化范围;常用索范围内的索直径变化对柔性支架结构风振响应的影响较小;各风速下的平均风振系数随预紧力增大而减小,以此拟合出中小跨度柔性支架风振系数计算公式。In this paper,based on the Davenport spectrum,the AR method is used to analyze the wind vibration response and the value of the wind vibration coefficient for the small and medium-span flexible supports.By changing the parameters such as pre-tightening force,wind speed,cable diameter,etc.,the displacement and cable tension response laws of small and medium-span flexible supports are obtained,and the wind vibration coefficient of the structure is calculated by the equivalent force method.Research indicates:Increasing the cable pretightening force has little effect on the wind vibration response of the structure displacement,but it can reduce the wind vibration response of the cable tension.When designing,it is recommended to calculate the wind vibration coefficient of the cable according to the cable tension.The influence of wind speed change on the wind vibration response of flexible support structures is fluctuating.The fluctuation range of the structure's wind vibration response under each wind speed should be considered in the analysis of the calculation of the wind vibration coefficient.The change of the cable diameter within the common cable range has little effect on the wind vibration response of the flexible support structure.The average wind vibration coefficient at each wind speed decreases with the increase of the preload,and the calculation formula of the wind vibration coefficient of the small and medium-span flexible supports is fitted,and the formula has a good correlation.

关 键 词：DAVENPORT谱 中小跨度 预应力柔性光伏支架 风振响应 风振系数 

分 类 号：TM614[电气工程—电力系统及自动化]