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 引用本文: 杨仕骏, 阳洋, 王者伟, 程赟, 许文明, 陶帅. 基于单辆通行车激励的车桥耦合理论梁式桥阻尼比识别研究. 力学学报, 2024, 56(3): 1-12.
Yang Shijun, Yang Yang, Wang Zhewei, Cheng Yun, Xu Wenming, Tao Shuai. Damping ratio identification of beam bridge based on vehicle bridge coupling theory under single vehicle. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(3): 1-12.
 Citation: Yang Shijun, Yang Yang, Wang Zhewei, Cheng Yun, Xu Wenming, Tao Shuai. Damping ratio identification of beam bridge based on vehicle bridge coupling theory under single vehicle. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(3): 1-12.

## DAMPING RATIO IDENTIFICATION OF BEAM BRIDGE BASED ON VEHICLE BRIDGE COUPLING THEORY UNDER SINGLE VEHICLE

• 摘要: 提出一种在单辆通行车激励的情况下, 基于车桥耦合理论识别桥梁阻尼比的方法. 首先, 将集成化检测车设计为单自由度体系, 利用集成在检测车上的传感器采集信号并滤波获取桥梁一阶响应信号, 通过相邻峰值点做比值并取平均得到桥梁一阶阻尼比, 理论推导出检测车停靠在桥面任一位置均可识别出桥梁一阶阻尼比. 其次, 考虑通行车车速、检测车停靠位置、环境噪音、桥梁阻尼比和通行车阻尼对识别结果的影响, 通过数值模拟验证该方法的有效性, 并与工程上经典的随机子空间法和文献方法进行对比. 最后, 在梁式桥实桥试验进行初步验证, 说明本文方法的工程适用性. 研究结果表明: 所提方法对检测车在桥面上的停靠位置没有具体要求, 避免了路面粗糙度对阻尼比识别结果的影响, 通行车的阻尼和车速在一定范围内对阻尼比识别无明显影响, 并且在信噪比30 dB以上可识别出桥梁一阶阻尼比, 具有较好的鲁棒性, 操作简单且不需要封桥, 可有效促推在实际工程中进行桥梁一阶阻尼比识别.

Abstract: This paper comes up with a new method for identifying the bridge damping ratio based on the vehicle bridge coupling theory under the excitation of a single passing vehicle. Firstly, the integrated inspection vehicle is designed as a single degree of freedom system. The accelerometers integrated on the inspection vehicle are used to collect signals and filter to obtain the bridge frequency response signal of the first mode. The ratio of adjacent peak points is calculated and averaged to obtain the bridge damping ratio of the first mode. Theoretical derivation shows that the inspection vehicle can identify the bridge damping ratio of the first mode when the inspection vehicle parked at any position on the bridge deck. Secondly, considering the influence of the passing vehicle speed, parking position of the inspection vehicle, environmental noise, bridge damping ratio of the first mode and the damping of passing vehicle on the identification results, the effectiveness of this method is verified by the numerical simulation. And comparative studies were also conducted on the classical stochastic subspace method and literature method. Finally, the field test of beam bridge was used to demonstrate the practical applicability of the proposed new method. The research results indicate that the proposed method has no specific requirement on the parking position of the inspection vehicle, avoids the influence of the road roughness on the result of the damping ratio identification, and the passing vehicle damping and speed have no significant influence on the identification of the damping ratio within a certain range, besides, the proposed approach can identify the bridge damping ratio of the first mode with SNR ≥ 30 dB. It has good robustness, simple operation, and does not require bridge closures. It can significantly promote the identification of bridge damping ratio of the first mode in practical engineering.

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