摘要
通过有限元分析和基于环境激励的模态试验分析,研究了润扬长江公路大桥南汊悬索桥挂缆前后桥塔的动态特性。在分析挂缆后桥塔动态特性时,将上部结构的作用转化为弹性约束,建立了等效模型进行分析,推导了主缆等效约束刚度的近似计算公式。结果表明:挂缆前后桥塔顺桥向动态特性变化较大,横桥向变化较小;等效有限元模型是合理的,悬索桥的振动可以分为2种体系运动,塔的振动特性可以单独取出进行分析。该结论为验证设计理论和后期维护提供了重要依据。
The dynamic properties of the tower of Runyang Yangtze River Nancha Suspension Bridge were studied before and after installing cable by finite element method and the modal experiment analysis based on environmental stimulation. A model of the tower-cable system with solid element and combine element was built, and the dynamic interactions between tower and cable, the changes in dynamic characteristics from the free-standing towers to tower-cable system were obtained. Results demonstrate that the cable has more significant effect on in-plane vibration than that on out-plane. The analytical results of the finite element model were verified by the testing results. The dynamic behaviour of the suspension bridge can be seperated into two parts, and the main tower＇s dynamic properties can be analyzed independently. The conclusions provide essential reference for the verification of design theory and the maintenance of bridges.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2007年第5期54-58,共5页
China Journal of Highway and Transport
基金
国家自然科学基金项目(50378017)
国家高技术研究发展计划("八六三"计划)项目(2006AA04Z416)
关键词
桥梁工程
悬索桥
有限元分析
动态特性
桥塔
模态试验
环境激励
bridge engineering
suspension bridge
finite element analysis
dynamic characteristic
bridge tower
modal experiment
environmental stimulation
