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基于模态柔度矩阵检测结构损伤的指标较多,如模态柔度差、模态柔度改变率和模态柔度曲率差等,这些指标都具有一定的有效性,然而,这些指标均需要损伤前、后的柔度矩阵,对实际工程应用有一定的限制性。通过提出一种仅基于损伤柔度曲率不需要结构损伤前的信息的新指标,分别对一个简支梁和一个两跨连续梁进行数值计算。通过数值分析结果表明:不论对单处损伤、多处损伤和轻微损伤,该指标均能清楚地判定结构的损伤位置;该指标值随着损伤程度的增加而增加,能定性地反映结构的损伤程度;新指标的抗噪性能也较好。
There are many indicators of structural damage detection based on modal compliance matrix, such as poor modal flexibility, modal flexibility change rate and modal flexibility curvature, etc. These indexes all have certain validity. However, Need to damage the front and rear of the flexibility matrix, the practical application of certain restrictions. By proposing a new index that does not require pre-structural damage based on the damage compliance curve, a simple beam and a two-span continuous beam are numerically calculated. The results of numerical analysis show that this index can clearly determine the damage location of the structure, regardless of the single damage, the multiple damage and the slight damage. The index value increases with the increase of the injury degree and can qualitatively reflect the damage of the structure Degree; new index of anti-noise performance is better.