發(fā)布時間：2018-09-10 14:34

【摘要】：基于振動參數的結構損傷識別,是近年來土木工程的熱點研究課題,振動參數包括頻率、振型、頻響函數、模態(tài)應變能、應變響應和加速度響應等,當結構損傷時,損傷位置附近將產生應力重分布,從而引起應變的變化,因此對比損傷前后的應變或者應變響應參數,可以用來識別結構損傷.提出了一種應變脈沖響應協(xié)方差參數,它是應變脈沖響應在時間區(qū)間上的能量積分;推導并證明了該參數是結構模態(tài)參數(頻率,位移模態(tài),應變模態(tài),阻尼等)的函數,可用來表征結構狀態(tài).相比于傳統(tǒng)的模態(tài)參數識別方法,可以保留更高階的模態(tài)參數,而且避免了模態(tài)識別可能引起的誤差;基于簡支鋼梁的多種損傷工況,研究和展示了該參數的特性,通過數值模擬發(fā)現(xiàn),該參數能簡單直觀地判定損傷發(fā)生和識別損傷位置,無需建立結構分析模型,只需比較結構損傷前后的應變脈沖響應協(xié)方差參數即可;該參數簡便易算,具有較好的抗噪性能,對結構損傷敏感,而且對結構剛度減少呈現(xiàn)一致變化特性,所以適合實際工程結構的健康監(jiān)測和損傷識別.
[Abstract]:Structural damage identification based on vibration parameters is a hot research topic in civil engineering in recent years. Vibration parameters include frequency, mode shape, frequency response function, modal strain energy, strain response and acceleration response. The stress redistribution will occur near the damage location, which will cause strain change. Therefore, comparing the strain or strain response parameters before and after damage, it can be used to identify the structural damage. In this paper, a strain pulse response covariance parameter is proposed, which is the energy integral of the strain pulse response in the time interval, and the parameter is derived and proved to be a function of the structural modal parameters (frequency, displacement mode, strain mode, damping, etc.). It can be used to characterize the structural state. Compared with the traditional modal parameter identification method, the modal parameters of higher order can be retained and the errors caused by modal identification can be avoided. By numerical simulation, it is found that this parameter can be used to determine the damage occurrence and identify the damage location simply and intuitively. It is not necessary to establish a structural analysis model, but only to compare the parameters of the strain pulse response covariance before and after the damage, and the parameters are simple and easy to calculate. It is suitable for the health monitoring and damage identification of practical engineering structures because of its good anti-noise performance, sensitive to structural damage and uniform variation to the reduction of structural stiffness.
【作者單位】： 暨南大學力學與建筑工程學院;
【基金】：國家自然科學青年基金(51208230) 教育部博士點新教師基金(11612438)資助項目
【分類號】：TU317

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