结构动力模型物理参数模态识别方法及应用
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摘要
在结构振动计算中，很多结构可以简化为竖向悬臂杆，以层间剪切或层间弯剪模型进行时程分析。由于结构物理参数的不确定性及建立模型时所做的假设，理论计算模型和真实计算模型在动态特性上存在差异。鉴于此，提出结构动力模型物理参数的模态识别方法，这种方法利用递归算法对结构进行解耦，只用实测的一个或二个模态数据即可识别结构物理参数。而且，利用这种方法所识别的物理参数考虑了结构各杆件、各楼层之间的动态耦合效应及轴向、剪切等各种变形的影响，使简化模型更接近原始模型，从而提高了动力反应的计算精度。将该方法与结构地震损伤状态参数的计算方法相结合，可以进行结构地震损伤识别及倒坍预报分析。具体工程应用实例的计算结果表明，它对结构物理参数估计及损伤识别不失为一种有效的方法。
For structures as framed structures,they are always simplified to a series multidegree of freedom system .A difficult problem in analysis is how to accurately determine the regidity coefficents and the mass coefficents of the system.In order to solve the problem,a parameter identification method is presented with the measurement mode data according to analytical computation of inverse problem in vibration.By means of a recursive algorithm,the physical parameters and inner states of structure can be determined from one or two test mode data.The method combines the dynamic coupling efforts and static deformation of the inner states in strucutre.The simplified system is more accuratelly coincide with the orginal structure and the calculational accuracy of dynamical reponse is heightened useing the mothed.Combined this method and the calculational method of the earthquake damage states of structure,the damage states and the collapsing states forecasting can be estimated.
For structures as framed structures,they are always simplified to a series multidegree of freedom system .A difficult problem in analysis is how to accurately determine the regidity coefficents and the mass coefficents of the system.In order to solve the problem,a parameter identification method is presented with the measurement mode data according to analytical computation of inverse problem in vibration.By means of a recursive algorithm,the physical parameters and inner states of structure can be determined from one or two test mode data.The method combines the dynamic coupling efforts and static deformation of the inner states in strucutre.The simplified system is more accuratelly coincide with the orginal structure and the calculational accuracy of dynamical reponse is heightened useing the mothed.Combined this method and the calculational method of the earthquake damage states of structure,the damage states and the collapsing states forecasting can be estimated.
引文
1王云剑振动反问题在工程中的应用地震工程与工程振动，1995，15（3）2李洪泉，欧进萍剪切型钢筋混凝土结构地震损伤识别哈尔滨建筑大学学报，1996，29（2）3李桂清抗震结构计算理论和方法北京：地震出版社，19854格拉德威尔GML王大均，何北昌译振动中的反问题北京：北京大学出版社，19915李德森，沈聚敏五层钢筋混凝土板柱结构模型振动台试验研究结构模型的振动台试验与研究北京：清华大学出版社，1990
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