斜拉索剪切一体化内置阻尼器研发及应用  

Research and Application of Shear Integrated Built-In Dampers Suitable for Stay Cables

作　　者：盛能军 金朝 赵海威 李亚敏 SHENG Nengjun;JIN Zhao;ZHAO Haiwei;LI Yamin(State Key Laboratory for Bridge Intelligent and Green Construction,Wuhan 430034,China;China Railway Britech Co.,Ltd.,Wuhan 430034,China)

机构地区：[1]桥梁智能与绿色建造全国重点实验室,湖北武汉430034 [2]中铁桥研科技有限公司,湖北武汉430034

出　　处：《世界桥梁》2024年第4期61-68,共8页World Bridges

基　　金：国家自然科学基金项目(52278309)。

摘　　要：为提高大跨度斜拉桥斜拉索在风、风雨荷载作用下抗振能力,以高阻尼橡胶为阻尼元件,研发了一种以延长索导管为支撑结构,利用高阻尼橡胶剪切变形耗能的剪切一体化内置阻尼器。对剪切一体化内置阻尼器进行性能分析、参数优化,并依托洪奇门特大桥进行阻尼器减振效果实桥试验。结果表明:剪切一体化内置阻尼器高阻尼橡胶在剪切变形时具有较高且稳定的损耗因子,剪切变形的耗能能力是压缩耗能的3倍以上;除受垂度影响较大的1阶模态外,剪切一体化内置阻尼器在最优剪切面积下对各阶振动模态阻尼减振效果基本一致;剪切一体化内置阻尼器支撑结构的刚度保证率均大于80%,可有效发挥阻尼器的设计减振效果;剪切一体化内置阻尼器附加对数衰减率均大于3%,实测振动加速度的减振率达99.6%,可满足大跨度斜拉桥斜拉索减振的阻尼需求。剪切一体化内置阻尼器具有与斜拉索呈一体化构造,减振能力各向同性,景观效果影响小,减振效果优良等特点。This paper presents a type of shear integrated built-in dampers that feature the extension cable conduits which serve as supporting components as well as the high-damping rubbers that resolve their shear deformation into energy dissipation capacity of the dampers,aiming to enhance the resistance of stay cables of long-span cable-stayed bridge to vibrations induced by wind loads and rain-wind interactions.The damping performance of the shear integrated built-in dampers was analyzed and parameters were optimized,and the vibration-mitigating effect was verified in the Hongqimen Bridge.It is shown that the high-damping rubber exhibits high and stable energy dissipation factor during the shear deformation process,and the energy dissipation capacity based on shear deformation is three times that of the compression energy dissipation.The shear integrated built-in dampers with optimal shear areas display roughly the same damping effects for different modes of vibrations,with the exception of the first-mode vibrations.With a stiffness guarantee rate over 80%,the shear integrated built-in dampers can display the required design damping mitigation effect.The additional logarithmic decrement and measured vibration mitigation rate of the shear integrated built-in dampers is over 3%and reaches 99.6%,respectively,proving that the dampers can satisfy the damping requirements of stay cables of the long-span cable-stayed bridge.Being an integral part of the stay cables,the shear integrated built-in dampers show isotropic damping ability,bring minimal landscaping disruption,and perform sound vibration mitigation effect.

关 键 词：斜拉桥 斜拉索 振动控制 剪切一体化内置阻尼器 高阻尼橡胶 剪切变形 延长索导管 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]