基于子结构中弯曲波的拉索索力识别方法
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作者单位:

1.中交第二公路工程局有限公司;2.重庆交通大学 土木工程学院

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U448

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中国交建特大研发项目(2019-ZJKJ-07)


Cable force identification method based on bending wave in substructure
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Affiliation:

1.CCCC Second Highway Engineering Co Ltd,Xi’an;2.School of Civil Engineering,Chongqing Jiaotong University

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    摘要:

    频率法目前仍是正在修建或是已经修建的斜拉桥中测试索力的最常用的方法,但是它的稳定性和精确性仍然存在一些问题。本文从行波的角度,以轴向受拉修正Timoshenko梁模型为理论依托,对拉索结构的动力特性进行了研究。基于梁结构中的弯曲波传播特性,通过3个测点的频域响应,基于最小二乘法拟合得到波分量系数,再以拟合残差最小为目标进行拉索索力和抗弯刚度的识别,并通过拉索振动的数值模拟实验验证了本方法的精确性。相比传统的频率法,本方法基于子结构索力识别,不受减震器影响,而且可通过识别的子索段索力通过静力分析反推拉索各个位置的索力,打破了拉索索力为单一值的观念,同时在各频率采样点处均能识别出相应索力,减小了外部干扰对索力识别对影响。

    Abstract:

    For cable-stayed bridges that are being built or built, the frequency method is currently the most common method of testing cable forces, but its stability and accuracy still have some problems. In this paper, from the perspective of traveling wave, the dynamic characteristics of the cable structure are studied by the axial tension correction Timoshenko beam model. The bending wave propagation characteristics in the beam structure are studied. The least-square method is adopted by the frequency domain response of three measuring points. The wave component coefficients are obtained, and the cable force and bending stiffness are identified by fitting the minimum residual. The accuracy of the method is verified by numerical simulation of hammering. Compared with the traditional frequency method, this method is It is the cable force identification of the cable section, which is not affected by the shock absorber. Moreover, the cable force of each position of the cable can be reversed by static analysis through the cable force of the identified cable section, which breaks the concept that the cable force is a single value. At the same time, the corresponding cable force can be identified at each frequency sampling point, which reduces the impact of external interference on cable force identification.

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  • 收稿日期:2019-11-11
  • 最后修改日期:2019-12-27
  • 录用日期:2020-02-05
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