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对具有一定程度损伤的框架结构来说,模态位移动力检测指标难以有效地反映结构的损伤状况。为了提高诊断效率和诊断结果的可靠性,采用结构损伤的单元模态应变能变化率方法构造框架结构损伤定位的识别指标。通过对一个典型框架结构的数值模拟研究表明:该方法仅需低阶模态参数,无论是单一位置损伤、对称部位损伤、轻微损伤,还是多种损伤共存,均具有损伤定位的能力;且在一定噪声水平下具有较强的抗噪能力。给出根据损伤单元模态应变能变化率值的大小,确定损伤程度的实用方法。
For a certain degree of damage to the frame structure, the modal displacement dynamic detection of indicators is difficult to effectively reflect the structural damage. In order to improve the diagnostic efficiency and the reliability of diagnostic results, the identification index of damage location of frame structure is constructed by using the rate of change of unit modal strain energy of structural damage. The results of numerical simulation of a typical frame structure show that this method requires only low-order modal parameters, and it has the ability of locating damage in both single-site damage, symmetric site damage, minor damage and multiple damage coexistence. Certain noise level has a strong anti-noise ability. The practical method of determining the degree of damage according to the magnitude of the rate of change of modal strain energy of the damaged unit is given.