大悬挑屋盖结构采用筒式粘弹性阻尼器的风振控制应用研究

Application study of wind vibration control for a large cantilevered roof structure with circular tube viscoelastic dampers

合肥体育中心综合体育馆为大悬挑钢网架屋盖结构,悬挑28.23m。该屋盖结构悬挑跨度大,造型复杂,且悬挑部分上、下表面均受到风的作用,原设计方案的悬挑自由端竖向位移超出了规范的规定。为有效抑制风振响应、改善结构抗振性能,采用筒式粘弹性阻尼器对其进行风振控制。根据消能支撑的风振控制力、等效刚度、等效耗能因子及结构动力特性,在大悬挑钢屋盖结构的关键部位设置附加的消能支撑。研究和实践表明,设置消能支撑后,明显减小了风振的竖向位移反应,其强度和刚度均满足规范要求,取得了很好的社会效益和经济效益。

The roof structure of Hefei Gym Center is the large cantilevered steel spatial truss, which span is 28.23 m. The vertical displacement response of large eantilevercd roof exceeds the code prescript. For mitigating wind-induced vibration and improving structure vibration behavior,the circular tube VE dampers are applied to controlling the response of the large cantilevered steel spatial truss. The control force, equivalent stiffness and equivalent loss factor of energy dissipation brace are put forward. According to the structural characteristic, the energy dissipation bracings are set up to key position to achieve the objective of energy dissipation control. The study shows that the vertical displacements are reduced obviously. The project has got good social benefit and economic benefit.