【作者】 王涛； 王邦杰； 李正良；

【Author】 WANG Tao;WANG Bang-jie;LI Zheng-liang;School of Transportation Science and Engineering,Harbin Institute of Technology;Chongqing Research Institute of Harbin Institute of Technology,Harbin Institute of Technology;School of Civil Engineering,Chongqing University;Chongqing Key Laboratory of Wind Engineering and Wind Resources Utilization,Ministry of Education;

【机构】 哈尔滨工业大学交通科学与工程学院； 哈尔滨工业大学哈尔滨工业大学重庆研究院； 重庆大学土木工程学院； 风工程及风资源利用重庆市重点实验室(重庆大学)；

【摘要】 复杂山区地形包括不同数量的连续山体,连续山体数量对处于其中的耐张型悬索支撑输电结构风振响应有一定影响。为了分析不同数量连续山体对耐张型悬索支撑输电结构风振响应的影响,本文首先进行了连续山体影响下的山地风场特性风洞试验,在此基础上,讨论了平均风加速比和脉动加速比随连续山体数量的变化规律,并提出了相应的计算模型。然后,采用非线性有限元方法建立了考虑连续山体影响的耐张型悬索支撑输电结构风振非线性有限元分析框架。最后,通过提出的框架对处于连续山体中的某两跨耐张型悬索支撑输电结构进行了风振响应分析。结果表明:随着连续山体数量的增加,山顶处平均风加速比先增大后平稳,在背风面山脚处,平均风加速比先增大后减小,而最大脉动风加速比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。更多还原

【Abstract】 Complex hilly terrain includes different numbers of consecutive hills,which have a certain impact on the wind-induced vibration response of the tension suspension-braced transmission structure in the complex hilly terrain.In order to analyze the wind-induced vibration response of this transmission structure in the complex hilly terrain,wind tunnel tests on the characteristics of the hilly terrain wind field under the influence of consecutive hills are finished at first.On this basis,the variations of the mean velocity speed-up ratio and the fluctuating velocity speed-up ratio with the number of consecutive hills are studied,and the calculation models of the mean velocity speed-up ratio and the fluctuating velocity speed-up ratio are propose.Subsequently,a nonlinear finite element analysis framework for wind-induced vibration of the tension suspension-braced transmission structure considering the influence of consecutive hills is established by the nonlinear finite element method.Finally,a two-span tension suspension-braced transmission structure is selected as an example,and considering the influence of consecutive hills,the wind-induced vibration response is analyzed by the proposed framework.The results indicate that:With the number of consecutive hills increases,the mean velocity speed-up ratio at the crest first increases and then stabilizes.At the foot of the leeward side,the mean velocity speed-up ratio first increases and then decreases,while the maximum fluctuating velocity speed-up ratio shows a trend of first decreasing and then increasing.In terms of the midpoint lateral displacement and midpoint tension of the conductor and supporting-conductor suspension cable,their mean and standard deviation show a trend of first decreasing,then increasing,and then gradually stabilizing with the number of consecutive hills increases.The numbers of consecutive hills have a significant impact on the mean value of the midpoint lateral displacement of the conductor and supporting-conductor suspension cable,with a relatively mild impact on their standard deviation,while the opposite is true for the midpoint tension.更多还原