摘要
以苏通大桥为背景,研究超高索塔自立状态下的振动行为。首先介绍大桥300.4 m高的超高索塔在施工阶段独立状态下的环境振动试验,采用峰值法、随机子空间法及随机减量法识别得到索塔多阶振动模态参数。同时,按照施工设计图建立索塔三维有限元模型(FEM)来分析其动力特性。最后通过将环境振动测试结果与FEM分析结果的比较,揭示超高索塔自立状态下的振动行为特征。
Based on the background of the Sutong Bridge,the dynamic behavior of the super-high cable-tower was studied as in independent state. Firstly, the ambient vibration tests that were carried out on the 300.4 m height cable tower in the self-erected phase were introduced. Some orders of vibration mode parameters were identified by using the frequent-domain peak-picking method, the time-domain stochastic subspace parameter identification method and random decrement technique. Meanwhile ,3-D finite model （FEM） of the cable tower was developed according to the construction and design drawings to analyze the dynamic characteristics. Finally, the dynamic behavior characters was elicited by comparison analysis between the results respectively get from the ambient vibration tests and FEM analysis.
出处
《结构工程师》
2008年第3期129-134,共6页
Structural Engineers
基金
国家科技支撑计划--苏通大桥建设关键技术研究(2006BAG04B01)
关键词
苏通大桥
动力特性
随机子空间
谱峰值法
随机减量
Sutong bridge, dynamic characteristic, stochastic sub-space, peak-picking method, randomdecrement technique
