斜拉索倾角对振动法测索力的精度影响
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TH212; TH213.3

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国家自然科学基金资助项目(51878234);中央高校基本科研业务费专项资金资助项目(JZ2019HGPA0101)


Influence of Inclination Angle on Accuracy of Vibration Based Cable Force Identification
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    摘要:

    现有的基于振动的索力测试方法在推导过程中,多以水平索为模型,未考虑斜拉索倾角对索力识别精度的影响。为了分析倾角对振动法测索力的精度影响,以两端固支索为例,采用有限差分法求解索的模态参数,并由迭代法识别索力,研究倾角对索的模态参数和索力识别精度的影响。结果表明,采用第1阶频率识别小垂度索的索力,与采用第1阶或第2阶频率识别大垂度索的索力时,不考虑倾角的影响,索力识别的误差很大。

    Abstract:

    Vibration based cable force identification methods have been widely used in the field of bridge health monitoring and inspection for their simple and effective properties. However, the inclination angle on the cable force identification accuracy is not considered as horizontal arranged cable model is adopted in the theory derivation. In fact, the angle of inclination leads to the linear distribution of cable force along the length direction, and the angle of inclination will have an impact on the sag of the cable, which affects the accuracy of cable force identification. In this paper, the modal parameters of the cables fixed at both ends are calculated by the finite difference method and the corresponding cable forces are identified by iteration method. Then the influences of the inclination angle on the modal parameters of the cable and the accuracy of the identified cable force identification are investigated via numerical example. The results show that the force identification errors are very large when the first order frequency is used for small-sag cables and the first or second order frequency is used for large-sag cables without considering the inclination effects.

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  • 在线发布日期: 2021-08-25
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