| 基于随机子空间结合稳定图的拱桥模态参数识别方法 |
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| 引用本文： | 常军,张启伟,孙利民.基于随机子空间结合稳定图的拱桥模态参数识别方法[J].建筑科学与工程学报,2007,24(1):21-25. |
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| 作者姓名： | 常军 张启伟 孙利民 |
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| 作者单位： | 1. 苏州科技学院,管理科学与工程系,江苏,苏州,215011;同济大学,土木工程防灾国家重点实验室,上海,200092
2. 同济大学,土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 为了避免目前常用的结构模态参数识别方法容易出现虚假模态等缺陷,提出了一种将随机子空间法与稳定图法相结合的模态参数识别方法。通过随机子空间法有效地从环境激励的结构响应中获取模态参数,通过稳定图方法确定系统阶次。通过对稳定图方法的改进,避免了虚假模态的出现,进而提高了随机子空间方法的识别精度,并在一钢管混凝土拱桥上对这种新方法进行了验证。结果表明,该方法具有良好的识别效果。
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| 关 键 词： | 参数识别 环境振动 动力特性 模态分析 随机子空间 稳定图 拱桥 |
| 文章编号： | 1673-2049(2007)01-0021-05 |
| 修稿时间： | 2006年12月26 |
Identified Method of Arch Bridge Modal Parameters Based on Stochastic Subspace Combined with Stabilization Diagram |
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| CHANG Jun,ZHANG Qi-wei,SUN Li-min.Identified Method of Arch Bridge Modal Parameters Based on Stochastic Subspace Combined with Stabilization Diagram[J].Journal of Architecture and Civil Engineering,2007,24(1):21-25. |
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| Authors: | CHANG Jun ZHANG Qi-wei SUN Li-min |
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| Abstract: | Authors presented an identified method of arch bridge modal parameters based on stochastic subspace combined with stabilization diagram for the presence methods having shortcomings for example false modes.Stochastic subspace identification(SSI) can be used to identify structural modal parameters by ambient vibration.The key work of SSI is to gain the order of the system.Stabilization diagram is a novel approach to decide the rank of the system,but this method easily yields false mode.Authors improved the stabilization diagram so that the false mode could be seeked out and the results became more precise.The improved method was evaluated by an actual steel tubular concrete bridge.The result shows that the new approach can gain more precise outcome. |
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| Keywords: | parameter identification ambient vibration dynamic property modal analysis stochastic subspace stabilization diagram arch bridge |
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