简支梁桥多位置损伤的检测方法

针对简支梁桥结构的安全监测和评价问题 ,研究了3种多位置结构损伤动力学检测方法。分析了柔度差方法应用于多位置损伤检测的局限性。提出柔度曲率的概念 ,只需结构前 2或 3阶振型和频率数据即可准确识别出结构多个损伤位置 ,有限元仿真实验结果验证了该方法的可行性和正确性。在研究敏感度矩阵计算的频率模式与实际频率相对变化模式相关性的基础上 ,改进了多位置损伤定位置信准则( m ultiple damage location assurance criterion,MDL AC)方法 ,算例表明该方法只需 10阶左右的模态频率就可预测结构上多个位置的损伤

Multiple damage detection of simply supported beam bridges

Three damage detection methods for multiple damaged sections in structures were investigated to improve safety monitoring of simply supported beam bridges. The flexibility difference method has disadvantages for multiple damage detection, so a flexibility curvature was developed that only requires the mode and frequency data of the first 2 or 3 modes. The feasibility and validity of the method were verified using finite element results. The frequency changing mode calculated from the sensitivity matrix was correlated with the practical frequency changing mode to develop modifications for the multiple damage location assurance criteria (MDLAC) method. The result shows that only about 10 modal frequencies are needed to predict multiple damage in structures.