Effect of Geometric Nonlinear Behaviour of a Guyed Transmission Tower under Downburst Loading
Downburst winds, which are a source of extreme wind loading and are referred to as high intensity wind (HIW) loads, have caused numerous transmission tower failures around the world.A previous investigation was conducted to study the performance of a transmission tower under downburst wind loading, where the behaviour of the tower was limited to a linear response.In the current study, a nonlinear frame element is used to assess the performance of the tower under downburst wind loading.The behaviour is studied using downburst wind field data obtained from a computational fluid dynamics (CFD) model.In order to assess the geometric nonlinear behaviour of the tower, the results are compared to a previous linear analysis for a number of critical configurations of a downburst.The nonlinear analysis predicted that peak axial loads in certain members can be up to 34% larger than those predicted by the linear analysis.
Geometric nonlinearity Finite-element Downburst Microburst High intensity wind Transmission line Transmission tower
C.Ladubec A.A.El Damatty A.M.El Ansary
Department of Civil and Environmental Engineering,The University of Waterloo,Waterloo,Ontario,Canada Department of Civil and Environmental Engineering,Western University,London,Ontario,Canada,N6A 5B9
国际会议
上海
英文
1240-1249
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）