超高索塔自立状态下环境振动试验与分析
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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.
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.
引文
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[2]常军,张启伟,孙利民.随机子空间方法在桥塔模态参数识别中的应用[J].地震工程与工程振动,2006,26(5):183-187.
[3]Ren Wenxin,Peng Xuelin.Baseline finite elementmodeling of a large span cable-stayed bridge throughfield ambient vibration tests[J].Computers andStructures,2005,83:536-550.
[4]Yu Bai,Thomas Keller.Model parameter identificationfor a GFRP pedestrian bridge[J].CompositeStructures,2008,82:90-100.
[5]Carmelo Gentile,Alberto Gennari Santori.Dynamictesting and modeling of a 30 years’old cable-stayedbridge[J].Structural Engineering international,2006(1):39-43.
[6]Peeters B,De Roeck G.Reference-based stochasticsubspace identification for output-only modal analysis[J].Mechanical Systems and Signal processing,1999,13(6):855-878.
[7]Peeters B,De Roeck G.Reference-based stochasticsubspace identification in civil engineering[J].Inverse Problems in Engineering,1999,100:1-28.
[8]Ibrahim S R.Random decrement technique for modalidentification of structures[J].The AIAA Journal ofSpacecraft and Rockets,1977,14(11).
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