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工程力学  2014 

基于非线性振动特性的预应力混凝土梁损伤识别

DOI: 10.6052/j.issn.1000-4750.2012.08.0611, PP. 190-194

Keywords: 预应力混凝土梁,损伤检测,非线性动力特性,盲源分离,Hilbert变换

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Abstract:

对2根后张有粘结预应力混凝土简支梁分别进行单调加载和二级等幅值疲劳加载试验,在各级加载后对试验梁进行动测得到自由振动加速度信号,对加速度信号进行盲源分离并进行Hilbert变换,得到各损伤状态下梁的频率-振幅曲线簇,分析其非线性振动特性随损伤状态的变化规律。结合裂缝开展情况和钢绞线的应力变化,探讨梁的非线性振动特性的变化与其损伤之间的关系。结果表明非线性振动特性适合于预应力混凝土梁的损伤检测。

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