不中断运营的既有桥梁模态参数识别
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摘要
为了在不中断桥梁运营的前提下使结构模态参数识别结果更精确,采用随机子空间方法对汽车荷载和环境激励共同作用下的不中断运营的桥梁结构进行模态参数识别研究,并采用一三跨连续梁的有限元模型进行了验证。结果表明,随机子空间方法可以识别汽车、环境共同作用下的桥梁结构模态参数识别,可以有效地识别环境激励下的不中断运营的桥梁结构的模态参数,拓展了随机子空间方法适用范围。
Structural modal parameter identification under ambient excitation gradually becomes a hot point of study for the academic and engineer circles. In order to gain more accurate modal parameters of bridge without interrupting bridge operation,the paper presents a research on in-service bridge modal parameter identification by stochastic subspace identification under the suppose that vehicle loads are component of the ambient excitation. A finite element model is used to verify this suppose. The results show that stochastic subspace identification can identify the bridge modal parameters under vehicle loads and ambient excitation. The method proposed will not interrupt the bridge operation and expend the usage scope of stochastic subspace identification.
引文
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