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Modal parameter identification of stay cables from output-only measurements

机译：通过仅输出测量来识别拉索的模态参数

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摘要

Stay cables are one of the most critical structural components in modern cable-stayed bridges and the cable tension plays an important role in the construction, control and monitoring of cable-stayed bridges. We propose a time domain and a time-frequency domain approaches for modal parameter identification of stay cables using output-only measurements. The time domain approach uses the subspace algorithm which is improved with a new modal coherence indicator. The time-frequency approach uses the wavelet transform of signals which is improved with a new analyzing wavelet. The wavelet transform is applied to the free response of ambient vibration which is obtained using the random decrement technique. Two experiments of stay cables are presented. The first experiment concerns a stay cable in laboratory where the external load is applied through an impact hammer and the vibratory signals are acquired through four accelerometers. The second experiment concerns the Jinma cable-stayed bridge that connects Guangzhou and Zhaoqing in China. It is a single tower, double row cable-stayed bridge supported by 112 stay cables. Ambient vibration of each stay cable is carried out using accelerometers. From output-only measurements, the modal parameters of stay cables are extracted. Once the eigenfrequencies and the damping coefficients are obtained, the cable forces and the Scruton number are derived. In a continuous monitoring and modal analysis process, the tension forces and Scruton numbers could be used to assess the health of stay cables in cable-stayed bridges.
机译：斜拉索是现代斜拉桥中最关键的结构部件之一，电缆张力在斜拉桥的建造，控制和监控中起着重要作用。我们提出了一种时域和时频域方法，用于使用仅输出测量值的斜拉索模态参数识别。时域方法使用子空间算法，该子空间算法通过新的模态相干指标进行了改进。时频方法使用信号的小波变换，并通过新的分析小波进行了改进。小波变换适用于使用随机减量技术获得的环境振动的自由响应。提出了两个拉索实验。第一个实验涉及实验室中的拉索，其中通过冲击锤施加外部负载，并通过四个加速度计获取振动信号。第二个实验涉及连接中国广州和肇庆的金马斜拉桥。它是一个单塔，双排斜拉桥，由112条斜拉索支撑。每条拉索的周围振动都使用加速度计进行。从仅输出的测量中，提取了斜拉索的模态参数。一旦获得本征频率和阻尼系数，就可以得出缆索力和Scruton数。在连续的监测和模态分析过程中，拉力和斯克鲁顿数可用于评估斜拉桥中斜拉索的健康状况。

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