圆形线状结构风致响应的分析方法

Wind-induced response analysis for circular section structure

获得不同风向、风速下结构的风致响应是进行风致疲劳寿命可靠性分析的基础。考虑顺风向脉动力、横风向脉动力以及由结构振动引起的自激力,对不同风向角不同风速下圆形线状结构风振响应进行估算。根据ESDU(En-gineering Sciences Data Unit)工程科学数据库的资料,在对结构进行风振响应估算的过程中,一定程度上记入雷诺数效应、结构表面粗糙度等重要因素对结构风力及风致振动响应的影响。最后,计算了一实际钢质圆形截面天线的风振响应,并与该天线的气动弹性模型风洞试验结果进行了比较。结果表明计算得到的结果与气动弹性模型试验结果吻合较好。

Wind-excited responses at different wind speeds and wind directions have to be acquired before analysis of wind-induced fatigue life reliability of structures. In this paper, wind-excited response of circular line-like structure is estimated at different wind speeds and directions, the excitations from along-wind fluctuating force, cross-wind fluctuating force and selfexcited force are taken into account in course of wind-excited response estimation. Some primary effects such as Reynolds number, surface roughness on the aerodynamic forces are considered based on some interrelated database in ESDU. Finally, a steel antenna of circular section as a case is analyzed. The wind induced vibration responses of the antenna obtained from computation are compared with those from the wind tunnel test of the aeroelastic full antenna model, and the comparison shows that they match well.