为实现板梁桥铰接缝损伤的定量定位识别，提出了一种基于递归奇异能量指标的损伤识别方法：首先将待测桥梁各相邻梁体的竖向冲击振动响应进行交叉递归分析并得到无阈值交叉递归矩阵，其次对各递归矩阵进行奇异值分解以进一步提取损伤特征，最后对奇异值求取能量（递归奇异能量指标，RSEI），进一步建立了基于该指标的铰接缝损伤识别方法，并对其适用性进行了分析。结果表明：RSEI指标对板梁桥铰接缝损伤较为敏感，所提方法仅在板梁桥跨中布置一排传感器即可实现铰接缝平均损伤程度的定量识别，并可实现损伤铰缝的定位，识别效果良好；铰接缝损伤位置、损伤个数及噪声对识别结果的影响极小，冲击位置会对识别结果造成一定影响，但识别效果在可接受的范围之内；应用RSEI指标开展板梁桥铰接缝损伤识别时，建议将冲击位置设在边梁跨中，可避免冲击位置对识别结果造成的影响，取得更加理想的识别效果。
Abstract
To achieve quantitative and locational identification of hinge joint damage in slab girder bridges, this paper proposed a damage identification method based on the recursive singular energy index: Firstly, the vertical impact vibration signals from adjacent girders of the bridge under investigation were analyzed using cross recursive, resulting in a threshold-free cross recursive matrix. Secondly, the matrix was subjected to singular value decomposition to further extract damage characteristics. Finally, the energy of the singular values was calculated to serve as a damage-sensitive index (Recurrence Singular Energy Index, RSEI). An application method for the RSEI index in hinge joint damage identification was established as well as its applicability was thoroughly explored. The results indicate that the RSEI index is sensitive to hinge joint damage in plate girder bridges. The proposed method can quantitatively identify the average degree of damage to hinge joints and the location of damaged hinge joints. by placing a row of sensors in the middle of the span, and it performs well. The identification results are minimally affected by the location of the damage, the number of damages, and noise. The impact location does have some effect on the results, but the identification performance remains within an acceptable range. When applying the RSEI index for hinge joint damage identification in plate girder bridges, it is recommended to place the impact location in the middle of the side girder to avoid the impact of the impact location on the identification results, thereby achieving more ideal identification results.
关键词
损伤识别 /
板梁桥 /
铰接缝 /
递归奇异能量 /
递归图
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Key words
damage identification /
slab beam bridge /
hinge joint /
recursive singular energy /
recursive graph
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