【摘要】：基于振動(dòng)參數(shù)的結(jié)構(gòu)損傷識(shí)別,是近年來土木工程的熱點(diǎn)研究課題,振動(dòng)參數(shù)包括頻率、振型、頻響函數(shù)、模態(tài)應(yīng)變能、應(yīng)變響應(yīng)和加速度響應(yīng)等,當(dāng)結(jié)構(gòu)損傷時(shí),損傷位置附近將產(chǎn)生應(yīng)力重分布,從而引起應(yīng)變的變化,因此對(duì)比損傷前后的應(yīng)變或者應(yīng)變響應(yīng)參數(shù),可以用來識(shí)別結(jié)構(gòu)損傷.提出了一種應(yīng)變脈沖響應(yīng)協(xié)方差參數(shù),它是應(yīng)變脈沖響應(yīng)在時(shí)間區(qū)間上的能量積分;推導(dǎo)并證明了該參數(shù)是結(jié)構(gòu)模態(tài)參數(shù)(頻率,位移模態(tài),應(yīng)變模態(tài),阻尼等)的函數(shù),可用來表征結(jié)構(gòu)狀態(tài).相比于傳統(tǒng)的模態(tài)參數(shù)識(shí)別方法,可以保留更高階的模態(tài)參數(shù),而且避免了模態(tài)識(shí)別可能引起的誤差;基于簡(jiǎn)支鋼梁的多種損傷工況,研究和展示了該參數(shù)的特性,通過數(shù)值模擬發(fā)現(xiàn),該參數(shù)能簡(jiǎn)單直觀地判定損傷發(fā)生和識(shí)別損傷位置,無需建立結(jié)構(gòu)分析模型,只需比較結(jié)構(gòu)損傷前后的應(yīng)變脈沖響應(yīng)協(xié)方差參數(shù)即可;該參數(shù)簡(jiǎn)便易算,具有較好的抗噪性能,對(duì)結(jié)構(gòu)損傷敏感,而且對(duì)結(jié)構(gòu)剛度減少呈現(xiàn)一致變化特性,所以適合實(shí)際工程結(jié)構(gòu)的健康監(jiān)測(cè)和損傷識(shí)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(xué)力學(xué)與建筑工程學(xué)院;
【基金】：國家自然科學(xué)青年基金(51208230) 教育部博士點(diǎn)新教師基金(11612438)資助項(xiàng)目
【分類號(hào)】：TU317

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