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应用ANSYS建立了空间刚架结构无损伤和有损伤的有限元模型,根据结构动态特性参数对损伤位置和损伤程度的敏感性分析,选取单元模态应变能变化率作为标示量应用于结构损伤识别。对空间刚架单元模态应变能变化率进行计算。结果表明,一阶应变能变化率能够很好地对单一或多个损伤的损伤位置进行识别,也能根据一阶应变能变化率对损伤程度进行初步判断,为探索通过应变能变化率识别空间刚架的结构损伤提供了一种可行的方法。
The finite element model of nondestructive and damage of space frame structure was established by ANSYS. According to the sensitivity analysis of damage location and damage degree of structural dynamic characteristic parameters, the rate of change of unit modal strain energy was selected as marking quantity and applied to structural damage identification . The rate of change of modal strain energy of rigid frame element in space is calculated. The results show that the first-order strain energy change rate can well identify single or multiple damage locations, and can also make preliminary judgments on the damage degree according to the first-order strain energy change rate. In order to explore the space identified by the rate of change of strain energy Structural damage to the frame provides a viable method.