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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。
In the calculation of structural vibration, many structures can be simplified as vertical cantilever rods, and the time-history analysis can be performed with inter-layer shear or inter-layer bending-shearing models. Due to the uncertainty of the physical parameters of the structure and the assumptions made when building the model, there are differences in the dynamic characteristics between the theoretical calculation model and the real calculation model. In view of this, a modal identification method for the physical parameters of the structural dynamic model is proposed. This method uses a recursive algorithm to decouple the structure, and the structural physical parameters can be identified only with one or two measured modal data. Moreover, the physical parameters identified by this method take into account the effects of various couplings, the dynamic coupling between the floors, and the effects of various deformations, such as axial and shear, on the structure, so that the simplified model is closer to the original model and thus improved. Dynamic calculation accuracy. Combining this method with the method for calculating structural earthquake damage parameters, structural seismic damage identification and dumping forecast analysis can be carried out. The calculation results of concrete engineering application examples show that it is an effective method for structural physical parameter estimation and damage identification.