斜拉索外置式黏滞阻尼器实用设计方法

Practical Design Method for External Viscous Damper of Stay Cable

为便于工程人员对斜拉索外置式黏滞阻尼器进行设计,快速获取阻尼器参数以及支撑刚度、安装高度等参数,在斜拉索-阻尼器系统模态阻尼比统一公式的基础上,通过公式变量分离、拉索参数统计等方法,得到了可近似独立衡量各参数影响的黏滞阻尼器实用设计方法。通过误差分析和设计实例验证了该方法的准确性与可靠性。结果表明:该实用设计方法得到的阻尼比与最优阻尼比的理论相对误差小于8.1%,实桥应用相对误差小于2.3%;工程人员可以应用此方法,根据拉索的类型、长度、索力等参数,方便地查表获得外置式黏滞阻尼器的设计参数及安装要求,其准确性及预留的安全系数能够满足工程设计要求。

To facilitate the design of external viscous damper of stay cable and rapidly obtain damper parameters such as supporting stiffness,installation height,etc.,based on the universal formula on damping ratio of cable-damper system,through variable separation of the formula and statistical study of cable parameters,apractical design method for viscous damper was proposed,which can approximately account for the influence of each parameter on damping ratio independently.Theoretical error analysis and example design analysis were carried out to verify the accuracy and reliability of the method.The results show that the theoretical relative error between the modal damping ratios obtained by simplified method and the optimal damping ratios is less than 8.1%,and the actual relative error for an example bridge is less than 2.3%.It is feasible and convenient for the engineers to obtain the design parameters and installation conditions of the external viscous dampers according to the cable type,length,and tension force.The design accuracy and preserved safety coefficient satisfy the engineering design requirement.