基于静态位移的简支桥梁损伤识别方法

以简支桥梁为研究对象,建立了基于静态位移的损伤识别方法.利用结构在相同载荷作用下、不同损伤状态的桥梁静态位移,提出了桥梁曲率比的损伤定位指标.利用结构基准状态即有限元基准模型建立了损伤程度识别公式.该公式可利用线性规划优化算法求解,其中有限元基准模型建立过程简单,只需要保证有限元基准模型的几何构型与桥梁结构相同即可.分...

The Method of Damage Identification of Simply Supported Bridges Based on Its Static Displacements

Based on static displacements,a damage identification method is proposed for simply supported bridges.In this method,a damage localization index named curvature ratio is built by using static displacements of structures subjected to the same loadings in different damage situations,and a formula for damage severity identification is derived by utilizing the finite-element baseline model of the corresponding structure.The formula can be readily solved by the optimization algorithm of linear programming and the baseline model can also readily be obtained just through keeping the geometries of the baseline model and the actual structure.A multi-damaged simple-supported beam is simulated numerically by the finite-element method to verify the correctness and efficiency of the proposed method.Results show that the curvature ratio index and the formula for damage severity identification are able to identify damage localizations and their damage severity,respectively.Owing to the fact that the damage identification method only depends on static displacements,it can be used for bridge inspections.