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本文考虑支撑刚度,系统研究粘弹性阻尼器在斜拉桥拉索减振统一设计方法。首先基于复阻尼理论,建立拉索-粘弹性阻尼器-支撑统一等效模型用于拉索减振分析,推导出等效存储模量和等效损失模量,并分析支撑刚度对其影响;其次,给出粘弹性阻尼器给拉索附加模态阻尼比解析表达式,并数值分析模态阶数、支撑刚度等参数影响;最后基于阻尼比分析给出支撑刚度设计和完整拉索粘弹性减振设计示例。
In this paper, considering the support stiffness, the viscoelastic damper is systematically studied in the unified design method of cable vibration damping of cable-stayed bridge. Firstly, based on the complex damping theory, a unified equivalent model of cable-viscoelastic damper-support is established for cable vibration analysis. The equivalent storage modulus and equivalent loss modulus are deduced and the influence of support stiffness is analyzed. Secondly, the analytic expression of modal damping ratio to the cable with viscoelastic damper is given, and numerical parameters such as modal order and supporting stiffness are analyzed. Finally, the design of supporting stiffness and the complete cable viscoelasticity are given based on the damping ratio analysis Example of vibration reduction design.