结构动力特性变化规律及结构损伤检测方法的试验研究
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摘要
结构的损伤改变结构的动力特性及动力响应。用试验测试结构及其损伤后的固有频率、加速度响应,结果表明,固有频率与加速度动力响应对结构损伤不敏感,即结构发生损伤时上述值均没有明显变化。同样,由共振时的响应值可以推知,振型也不宜作为结构损伤的判断标准。应变模态在损伤处发生突变表明,结构损伤时,损伤位置的应变会有明显变化,因此应变模态可以作为结构损伤的判据。基于曲率模态的结构损伤检测方法依然对损伤很敏感,对多处损伤的检测也有很好的效果。
Structural damage can change the dynamic characteristics and dynamic responses of the structure.Experiment is done to test the structure and the natural frequency and acceleration response.The result of the experiment indicates that the natural frequency and the dynamic response of acceleration are not sensitive to the structural damage.According to the response values of the structure at resonance,we can conclude that vibration shape is not suitable to be the standard of the damage.However,the strain mode mutates at the position of damage.That means when the structure is damaged,the strain of the damage position changes obviously.So the strain mode can be used to judge the structural damage.The structural damage method based on the curvature mode is effective and available to the detection of multi-site damage.
Structural damage can change the dynamic characteristics and dynamic responses of the structure.Experiment is done to test the structure and the natural frequency and acceleration response.The result of the experiment indicates that the natural frequency and the dynamic response of acceleration are not sensitive to the structural damage.According to the response values of the structure at resonance,we can conclude that vibration shape is not suitable to be the standard of the damage.However,the strain mode mutates at the position of damage.That means when the structure is damaged,the strain of the damage position changes obviously.So the strain mode can be used to judge the structural damage.The structural damage method based on the curvature mode is effective and available to the detection of multi-site damage.
引文
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[9]李功宇,郑华文.损伤结构的曲率模态分析[J].振动、测试与诊断,2002,6(2):136-152.
[2]汪源浩,沈小璞,王建国.超高层建筑结构的减震控制技术与抗震设计要点[J].合肥工业大学学报(自然科学版),2006,29(3):334-337.
[3]刘铁林,姜迎春,刘伟.地震作用下高层结构动力响应分析的一种数值方法[J].工程力学,2005,3(2):175-178.
[4]李国强,梁远森.振型曲率在板类结构动力检测中的应用[J].振动、测试与诊断,2004,6(2):111-116.
[5]Pandey,M.Biswas,M.M.Samman.Damage detec-tionfromchanges in curvature mode shapes[J].Journalof Sound and Vibration,1991,145(2):321-332.
[6]王山山,任青文.基于曲率模态振型的刚架结构损伤检测[J].动力学与控制学报,2005,3(2):81-86.
[7]李德葆,陆秋海,秦权.承弯结构的曲率模态分析[J].清华大学学报(自然科学版),2002,42(2):224-227.
[8]袁向荣.梁的破损对频率振型及振型曲率的影响[J].振动、测试与诊断,1994,14(2):40-44.
[9]李功宇,郑华文.损伤结构的曲率模态分析[J].振动、测试与诊断,2002,6(2):136-152.
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