摘要
针对适用于山区的新型输电结构——悬索支撑输电结构,为了评估连续山体数量对该结构性能的影响,该文进行了连续山体影响下边界层风洞试验;基于试验数据,分析了平均和脉动风速在不同数量连续山体影响下的演变趋势,并给出了平均风修正系数和脉动风修正系数的建议公式;提出了连续山体影响下悬索支撑输电结构的风致非线性动力分析方法;针对位于某耐张段的悬索支撑输电结构,评估了其风致动力响应受不同数量连续山体的影响。研究结果表明:当连续山体数量增加时,在山顶处,平均风修正系数先增大后平稳,在背风面山脚处,平均风修正系数先增大后减小,而最大脉动风修正系数呈现先减小后增大的趋势;就导线、支撑导线悬索的跨中位移和跨中张力而言,其均值和标准差随着连续山体数量增加呈现先减小再增加后逐渐平稳的趋势;不同数量连续山体对导线、支撑导线悬索跨中位移均值影响较为显著,对其标准差影响较小,而对于跨中张力则恰好相反。
To evaluate the impact of the number of consecutive hills on the structural performance of the new transmission structure(i.e.,suspension-braced transmission structure(STS))suitable for mountainous areas,boundary layer wind tunnel tests under the influence of consecutive hills are completed at first.Based on experimental data,the variation trends of mean and fluctuating wind speed under the influence of different numbers of consecutive hills are analyzed,and formulas for calculating the mean and fluctuating wind correction coefficient are proposed.Subsequently,a nonlinear analysis method considering the influence of consecutive hills is proposed for wind-informed dynamic response(WDR)of the STS.The influence of the number of consecutive hills on the WDR of the STS located in a strain section is investigated.The main conclusions are as follows:With the number of consecutive hills increases,at the hilltop,the mean wind correction coefficient first increases and then stabilizes.At the foothill of the leeward side,the mean wind correction coefficient first increases and then decreases,while the maximum fluctuating wind correction coefficient shows a trend of first decreasing and then increasing.As for the mid span of conductors and cables supporting conductors(CSCs),both the mean and standard deviation of displacement and tension show a trend of initial decreasing,then increasing,and then gradually stabilizing with the number of consecutive hills increases.In terms of the WDR of conductors and CSCs,the number of consecutive hills have a significant impact on the mean value of the midpoint lateral displacement,with a relatively mild impact on their standard deviation,while the impact on the tension at the mid span is the opposite.
作者
王涛
王邦杰
李正良
WANG Tao;WANG Bang-jie;LI Zheng-liang(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150090,China;Chongqing Research Institute of Harbin Institute of Technology,Chongqing 401151,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Chongqing Key Laboratory of Wind Engineering and Wind Resources Utilization,Chongqing University,Chongqing 400045,China)
出处
《工程力学》
EI
CSCD
北大核心
2024年第S01期31-37,共7页
Engineering Mechanics
基金
重庆市博士后研究项目特别资助项目(2022CQBSHBT3009)
哈尔滨工业大学重庆研究院博士后特别支持计划项目(KY506023002)。
关键词
连续山体
风洞试验
悬索支撑输电结构
耐张段
风振
consecutive hills
wind tunnel test
suspension-braced transmission structure
strain section
wind-informed vibration
