| 基于车激动力响应互相关指标的桥梁基础冲刷诊断方法 |
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| 引用本文： | 李岩,钟以琛,蔡春声,林雪琦,孙航.基于车激动力响应互相关指标的桥梁基础冲刷诊断方法[J].中国公路学报,2021,34(11):60-71. |
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| 作者姓名： | 李岩 钟以琛 蔡春声 林雪琦 孙航 |
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| 作者单位： | 1. 哈尔滨工业大学 交通科学与工程学院, 黑龙江 哈尔滨 150090;2. 路易斯安那州立大学 土木与环境工程系, 路易斯安 那巴吞鲁日 LA 70803;3. 福建省交通规划设计院有限公司, 福建 福州 350004 |
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| 基金项目： | 国家自然科学基金项目（52078164）；黑龙江省自然科学基金项目（LH2019E049）；山东省住建厅科技计划项目（2019-k4-1） |
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| 摘 要： | 针对当前桥梁基础冲刷诊断和检测方法过程复杂、成本高且受环境影响大等问题，提出一种基于车激动力响应互相关指标的桥梁基础冲刷诊断方法。该方法通过桥墩和桥跨不同测点的纵向加速度响应自由衰减段信号的互相关分析，建立基础冲刷诊断指标体系，实现冲刷定位和均匀性诊断。首先，依据互相关函数幅值向量置信度判据指标进行基础冲刷初判；然后，通过响应互相关函数幅值向量因子变化率向量进行冲刷定位，再根据横桥向互相关函数幅值变化率向量诊断冲刷均匀性；并通过统计评估方法提高诊断精度；最后，结合1座连续梁桥算例进行多种冲刷工况的数值仿真分析，对所提方法的有效性和适用性进行验证。结果表明：该方法能够很好地实现基础冲刷的定位和均匀性诊断，指标具有较高敏感性；同时具有较好的抗噪性能，通过所提出诊断指标体系的综合使用可消除噪声对诊断结果的干扰。该方法具有诊断结果精度高、过程简便易行、无需进行复杂且误差较大的模态识别、允许试验测试参数和条件适量变化等优点，可嵌入常规桥梁荷载试验同步开展，具有很好的工程应用潜力和实用价值。
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| 关 键 词： | 桥梁工程 基础冲刷诊断 互相关分析 车辆制动激励 车桥耦合振动 |
| 收稿时间： | 2020-09-25 |
Scour Diagnosis Method for Bridge Foundation Based on the Cross-correlation Index of Dynamic Response Excited by Vehicle |
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| LI Yan,ZHONG Yi-chen,CAI C S,LIN Xue-qi,SUN Hang.Scour Diagnosis Method for Bridge Foundation Based on the Cross-correlation Index of Dynamic Response Excited by Vehicle[J].China Journal of Highway and Transport,2021,34(11):60-71. |
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| Authors: | LI Yan ZHONG Yi-chen CAI C S LIN Xue-qi SUN Hang |
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| Affiliation: | 1. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China;2. Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, Louisiana, USA;3. Fujian Communications Planning & Design Institute Co. Ltd., Fuzhou 350004, Fujian, China |
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| Abstract: | To resolve the problems of existing techniques of bridge foundation erosion diagnosis and detection, such as complex detection procedures, high cost, and great environmental impact, a new method based on the cross-correlation index of vehicle excited response was proposed. This method established a scouring diagnosis system by analyzing the cross-correlation of the attenuation signals, which was a part of the longitudinal acceleration response, between observation points located on the bridge pier or mid-span of the girder under vehicle braking excitation. The aim was to determine the scour position and detect whether the scouring is uniform. First, an initial scouring diagnostic was performed for the entire bridge based on the cross-correlation function amplitude vector assurance criterion. Then, the scouring position was determined by the change rate vector of the cross-correlation function amplitude, and the evenness of foundation scouring was diagnosed through the change rate vector of the cross-correlation function amplitude in the transverse bridge direction. A statistical evaluation method to improve the diagnosis accuracy was used. Finally, a numerical simulation containing various scouring conditions was implemented to verify the reliability of this method based on a real continuous girder bridge. The results show that this method can effectively identify the scouring location and evenness. Diagnostic indices are sensitive to scouring damage. In addition, the influence of signal noise on diagnostic accuracy can be eliminated by using multi-index comprehensive evaluation. Compared with traditional diagnostic methods, it has the advantages of robustness and high accuracy of diagnosis results, simple and easy process, no necessity to perform complex modal recognition that may cause large errors, and allowing the variation of test parameters and conditions. Additionally, it can be embedded in conventional bridge load tests and carried out simultaneously with the load test, which has good engineering application potential and practical value. |
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| Keywords: | bridge engineering foundation scour diagnosis cross-correlation analysis vehicle braking excitation vehicle-bridge interaction |
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