粘滞惯质阻尼器对三维斜拉索减振效果的数值研究  

Numerical study on the vibration reduction effect of viscous inertial mass damper on three-dimensional stay cables

作　　者：李旭 杨斌 张念林 Li Xu;Yang Bin;Zhang Nianlin(Shandong Electric Power Engineering Consulting Institute Corporation Limited,Jinan Shandong 250000,China)

机构地区：[1]山东电力工程咨询有限公司,山东济南250000

出　　处：《山西建筑》2024年第12期139-143,159,共6页Shanxi Architecture

摘　　要：随着斜拉桥跨度的增大,斜拉索长度也越来越长,但安装位置存在变相折减,导致阻尼器所能提供的阻尼比降低,这给斜拉索减振阻尼器的设计带来了新的挑战。采用数值方法研究了粘滞惯质阻尼器(Viscous Inertial Mass Damper,VIMD)的斜拉索减振效果。首先,建立了两端点不处于同一水平高度的斜拉索面内运动微分方程,采用有限差分法对运动方程进行数值求解。然后,以苏通大桥A30号斜拉索为工程背景,对比分析了在惯性质量和阻尼系数这两个参数影响下张紧弦模型和斜拉索模型差异,研究了各参数对三维斜拉索-VIMD系统模态阻尼比的影响。研究结果表明:将联惯质单元并联连入传统粘滞阻尼器,可有效提高斜拉索的模态阻尼比;斜拉索-VIMD系统的动力特性分析可由张紧弦-VIMD系统代替,由于拉索倾角和阻尼器空间位置影响,二者之间存在倍数关系。As the span of the cable-stayed bridge increases,the length of the stay cables also becomes longer,but there is a disguised reduction in the installation position,resulting in a decrease in the damping ratio that the damper can provide,which brings new challenges to the design of the stay cable vibration damper.This article uses numerical methods to study the vibration reduction effect of Viscous Inertial Mass Damper(VIMD)on stay cables.Firstly,a differential equation of in-plane motion of the cable-stayed cable with two ends not at the same horizontal height is established,and the motion equation is numerically solved using the finite difference method.Then,taking the A30 cable-stayed cable of Sutong Bridge as the engineering background,the differences between the tension string model and the cable-stayed cable model under the influence of inertia mass and damping coefficient were compared and analyzed,and the effects of each parameter on the modal damping ratio of the tension string VIMD system were studied.The research results indicate that parallel connection of inertial elements in traditional viscous dampers can significantly improve the modal damping ratio of cable-stayed cables,which is very beneficial for vibration reduction;The dynamic characteristics analysis of the cable-stayed VIMD system can be completely replaced by the tension string VIMD system,and there is a multiple relationship between the cable inclination angle and the spatial position of the damper.

关 键 词：阻尼器 惯性质量 斜拉索 有限差分方法 阻尼比 

分 类 号：TU997[建筑科学—市政工程]