A harmonic vibration, output only and time-frequency representation based method for damage detection in Concrete piers of complex bridges

H. Ahmadi, F. Daneshjoo
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引用次数: 4

Abstract

Due to damage, vibrations of bridge piers compared with undamaged state would be changed. A new signal-based algorithm is proposed to extract feature and detect damage in complex bridges. According to the proposed algorithm, it is necessary to vibrate the bridge before and after damage by exciting force and record responses at the middle and top of the piers. For this purpose, sine and cosine transient forces were applied to the analytical model of Ghotour Bridge and the signals of pier responses were recorded. Using reduced interference distribution, the response signals were processed and time-frequency plans were calculated. Modified matrix subtraction method was proposed to detect damage. Based on the results, damage was identified and located with good accuracy. The proposed algorithm is an output-only method and in practice there is no need to create an analytical model of an existing complex bridge for damage detection.
基于谐波振动、仅输出和时频表示的复杂桥梁混凝土桥墩损伤检测方法
由于损伤,桥墩的振动与未损伤状态相比会发生变化。提出了一种基于信号的复杂桥梁特征提取与损伤检测算法。根据所提出的算法,需要在损伤前后对桥梁进行激振,并记录桥墩中部和顶部的响应。为此,对Ghotour大桥的解析模型施加正弦和余弦瞬态力,并记录桥墩响应信号。利用减小的干扰分布,对响应信号进行处理,计算时频计划。提出了改进的矩阵减法检测损伤的方法。在此基础上,对损伤进行了较准确的识别和定位。该算法是一种仅输出的方法,在实际应用中不需要对已有的复杂桥梁建立分析模型进行损伤检测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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