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动力参数法诊断结构损伤时往往需要完整的自由度信息,而在实际工程中很难测量到结构的全部自由度信息。以一钢筋混凝土简支梁为例,通过模态扩阶法将实测的不完备信息扩充到完备的实测信息,使理论自由度与实测自由度相匹配,在此基础上用振型转角差法和模态应变能法对该简支梁结构进行损伤识别。结果表明利用振型转角差法和模态应变能法均较好地实现了测试信息不完备情况下的结构损伤识别,另当相邻单元存在损伤时,模态应变能法比振型转角差法具有更好的识别能力和实用价值。
Dynamic parametric method often needs complete information of degrees of freedom when diagnosing structural damage, but it is difficult to measure all degrees of freedom information of structures in practical engineering. Taking a simply supported reinforced concrete beam as an example, the measured incomplete information is extended to the complete measured information by modal expansion method to match the theoretical degree of freedom with the measured degree of freedom. Based on this, And modal strain energy method to damage the simply supported beam structure. The results show that the structural damage identification based on the modal angle difference method and the modal strain energy method can be well achieved with the incomplete test information. In addition, when the adjacent unit is damaged, the modal strain energy method is better than the vibrational mode angle difference Act has better recognition and practical value.