龙卷风作用下输电塔结构的单向流固耦合分析  

One-way Fluid-structure Interaction Analysis of Transmission Tower Under Tornado Loading

作　　者：王勇[1] 吕令毅[1] 

机构地区：[1]东南大学土木工程学院,南京210096

出　　处：《特种结构》2017年第2期13-19,共7页Special Structures

摘　　要：本文利用单向流固耦合方法(One-wayuid-structure interaction,FSI)和规范方法计算龙卷风作用于输电塔结构的荷栽,并分析比较结构响应。FSI方法直接在足尺龙卷风风场中建立输电塔结构的刚性模型,通过CFD(Computationaluid dynamics)计算得到结构表面受到的龙卷风风压,并将结构表面受到的风压转化为输电塔梁单元模型的节点集中力,进行有限元分析。本文还将FSI方法和利用规范中的风荷栽公式计算并施加龙卷风荷载的分析结果进行对比。最后改变龙卷风的袭击角度,分别在0°、45。和90。工况下以FSI方法和规范方法进行结构响应的参数化分析。FSI方法计算的结构最大轴向力响应小于规范方法,且误差不大于20%。The tornado loads acting on transmission tower structure were calculated by the method of one-way fluid-structure interaction （FSI） and the wind load formula in design code, and the response of structure in these two cases was compared. The FSI method built the rigid model of transmission tower subjected to the full scale tornado load field. The surface pressure of structure due to tornado was calculated by computational fluid dynamics （CFD） and then converted to concentrated force acting on the nodes of the finite element model of tower, followed by a static analysis of the structure under tornado loading. The method of calculating and apply- ing tornado loads by code formula was also introduced in this paper to form a comparison with the case with FSI method. Finally, a parametric analysis on structural response was conducted by varying the attacking angle of tornados referred to the transmission line system （0, 45 and 90 degrees）. The maximum axial force calculated by the FSI method is smaller than the result calculated by the code method, and the error ratio is less than 20%.

关 键 词：输电塔结构 CFD 足尺龙卷风模拟 单向流固耦合分析 龙卷风袭击角度 

分 类 号：TU347[建筑科学—结构工程]