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相对位移模态而言应变模态在桁架结构损伤识别方面更具优势。基于动态和静态损伤识别指标,提出动静相结合的新识别指标。新指标具有动测法和静测法的优点,能够在一定程度上过滤掉非损伤单元的干扰,较单独使用动态指标和静态指标更准确、更具优势。通过对一桁架结构的单处损伤和多处损伤进行数值模拟,并分别使用动态、静态和动静结合的三种指标进行损伤识别效果的比较,表明新指标更具优越性。针对算例中不同类型的构件同时损伤时,应变差较小的构件不易识别的不足,提出了二次识别或多次识别的解决方法。
Strain mode is more advantageous in truss structure damage identification than relative displacement mode. Based on the dynamic and static damage identification indicators, a new identification indicator combined with the static and dynamic characteristics is proposed. The new index has the advantages of dynamic measurement and static measurement. It can filter out the interference of non-damaged cells to a certain degree, which is more accurate and more advantageous than using the dynamic index and the static index alone. Through the numerical simulation of single damage and multiple damage of a truss structure, the comparison of the damage identification results with the three indicators of dynamic, static and dynamic and static respectively shows that the new indicator has more superiority. Aiming at the problems that the components of different types in the case are damaged at the same time and the components with small strain difference are not easy to identify, a solution to the secondary recognition or multiple recognition is proposed.