中文摘要：

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。

英文摘要：

A few damage evaluation indicators based on modal flexibility matrix.These indicators,such as the change in modal flexibility,the rate in modal flexibility and the change in the modal flexibility curvature,were valid to some extent.However,these indicators need the flexibility matrix before and after damaging,were restricted to some extent in practical projects.In this paper,a new damage indicator was proposed based on damage flexibility curvature,which does not need the structure information before damaging.Two simulations,a simple beam and a two-span continuous beam,are utilized to verify the new indicator.Through the simulation results indicate that the damage location in structures,with single damage,multiple ones and slighter ones,can be detected efficiently.The value of the indicator is increased with the damage severity,the damage severity can be qualitatively detected.Anti-noise performance of the new damage indicator is better.