窄基塔风振系数分析  

Wind Vibration Coefficient Analysis of Narrow Base Transmission Tower

作　　者：孙志文[1] 黄文锋[2] Sun Zhiwen Huang Wenfeng(Hefei University of Technology, 230009, China Xuan Cheng Campus of Hefei University of Technology, 242000, China)

机构地区：[1]合肥工业大学土木与水利工程学院,230009 [2]合肥工业大学宣城校区,242000

出　　处：《特种结构》2016年第6期13-16,共4页Special Structures

基　　金：国家自然科学基金(51408174);中国博士后科学基金(2015T80652);安徽高校自然科学研究重点项目(KJ2016A294)

摘　　要：窄基塔作为风敏感结构,风荷载常常是其主控因素,而现有杆塔规范中无法获取窄基塔风振系数。为解决这一问题,本文以某一110kV直线型窄基角钢塔为工程背景,利用ANSYS建立有限元模型进行数值仿真计算,获得结构自振动力特性。在考虑节点风荷载空间相关性的基础上,利用Davenport谱对结构风荷载进行了准确模拟。结合动力时程计算方式对结构进行风振响应分析,计算得到窄基塔的风振系数,并与现行杆塔规范进行比较。研究表明,窄基塔风振系数随塔高增加而增大,在横担处出现突变。模拟得到窄基塔各段风振系数与规范值相差20%左右,塔腿及横担处相差更大。最后,基于动力时程计算结果提出了工程适用的窄基塔风振系数简化计算公式,为窄基塔的大范围使用提供便利。As a wind-sensitive structure, the wind load acting on the narrow base transmission tower becomes a main factor of the structure design. Unfortunately, there are no wind vibration coefficient in current tower code. To solve this problem, a 110kV narrow base angel-made-transmission tower was taken as an example and a finite model was established with ANSYS software. Then the natural vibration of structure was obtained. The wind load was accurately simulated with Davenport wind spectrum by considering the spatial correlation. Combinating the dynamic time methods, the wind-induced vibration responses of the tower were obtained. Meanwhile, the wind vibration coefficient were obtained and comparative analysis between codes and calculation were performed. The results showed that the wind vibration coefficient of tower head is larger than tower body. Finally, a simplified formula of wind vibration coefficient based on dynamic time result was provided in this paper, which would be helpful for wide range use of narrow base tower.

关 键 词：窄基塔 数值仿真 风荷载模拟 风振响应分析 风振系数 简化公式 

分 类 号：TU311.3[建筑科学—结构工程]