摘要
为完善光伏支架风荷载研究,首先对比分析不同规范光伏支架风荷载计算原则及相关参数取值特点;其次对某固定可调式光伏支架进行刚性模型测压风洞试验,得到典型倾角与风向角组合工况下光伏结构体型系数,并利用风洞试验结果进行瞬态分析得到典型工况下光伏支架风振系数;最后将试验得到的风荷载取值和相关参数与参考的各规范取值进行对比。结果表明:各规范及风洞试验风压系数、阵风影响评价系数和风荷载均存在明显差异;风洞试验风压系数明显低于各规范规定值,风振系数结果远大于国内规范值1.0,超过其1.64~2.05倍,与国外规范也存在很大差距。总的来说,结构迎风时风荷载与风压系数小于结构背风时按照中国规范进行光伏支架抗风设计结果偏激进,按照国外规范则结果偏保守;常用规范中光伏支架风荷载规定并不合理,为安全合理地指导光伏结构抗风设计,还需进行更多抗风研究。
In order to improve the wind load research of photovoltaic bracket.First,the calculation principle of wind load of photovoltaic bracket of various standards and the value characteristics of related parameters were compared and analyzed.Second,the shape coefficients of the solar structure under the combination of typical inclination angles and wind directions were derived by performing a rigid model load measurement wind tunnel test on a fixed adjustable photovoltaic.Transient analysis was used to determine the photovoltaic bracket wind vibration coefficients under normal operating settings from the results of the wind tunnel tests.Finally,the wind load values and related parameters obtained by the test were compared with the reference values of each standards.The findings demonstrate that there are clear discrepancies between various standards and wind tunnel tests'wind pressure coefficients,wind vibration coefficients,and wind loads.The wind pressure coefficient of the wind tunnel test is substantially lower than the stated value of each standards,and the wind vibration coefficient result is higher than the domestic standard value of 1.0,more than 1.64-2.05 times,and there is also a considerable difference with foreign standards.In general,when a structure is upwind as opposed to leeward,the wind load and wind pressure coefficient are lower.The wind resistance design of photovoltaic bracket according to Chinese standards is radical,while the outcomes are conservative by foreign standards.More wind resistance studies are required in order to safely and rationally guide the wind resistance design of photovoltaic bracket structures because the wind load provisions in common standards are not reasonable.
作者
陈权
牛华伟
李红星
姜东
Chen Quan;Niu Huawei;Li Hongxing;Jiang Dong(College of Civil Engineering,Hunan University,Changsha 410082,China;Northwest Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Xi’an 710075,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2024年第9期259-267,共9页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(52178477)。
关键词
光伏支架
风荷载
风洞试验
规范
有限元
photovoltaic bracket
wind load
wind tunnel test
standard
finite element
