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对柔度曲率法进行了改进,提出了基于柔度曲率曲线的结构损伤识别方法。提出了结构在健康状态下的完好柔度曲率曲线这一概念,并运用最小二乘法拟合构建该曲线;在此基础之上,进一步对结构损伤的程度进行了研究,通过损伤有效面积的大小来判断结构损伤程度。最后通过简支梁的单处和两处损伤对该方法进行了数值验证。结果表明:不需结构损伤前模态参数,该方法能够对简支梁发生单处和两处损伤进行准确定位及损伤程度分析;且损伤程度正比于损伤有效面积;同一损伤程度下,单元距离跨中位置越近损伤有效面积也越大。
The flexibility curvature method is improved, and a structural damage identification method based on the flexibility curvature curve is proposed. The concept of perfect flexibility curve of curvature under the condition of health was put forward and the curve was fitted by the least squares fitting method. On this basis, the degree of structural damage was further studied. The damage effective area To determine the degree of structural damage. Finally, the method is verified by single and two damage of simply supported beams. The results show that without pre-damage modal parameters, this method can accurately locate and damage the single beam and the two damaged beams. The damage degree is proportional to the effective area of the damage. Under the same damage degree, the unit distance The greater the effective area of lesion across the mid-position is.