基于子结构及模态柔度曲率差的某框架结构损伤识别  

Damage identification of a frame based on substructure and modal flexibility curvature difference

作　　者：马立元[1] 李世龙[1] 李永军[1] 王天辉[1] 

机构地区：[1]军械工程学院导弹工程系,石家庄050003

出　　处：《海军工程大学学报》2011年第5期21-26,共6页Journal of Naval University of Engineering

摘　　要：基于子结构思想,通过对框架结构中子结构的边界施加虚拟的数值支座,限制子结构边界的位移,把子结构从整体结构中隔离出来。运用提出的模态柔度曲率差方法对子结构进行了损伤识别。结果表明:该方法仅需低阶模态参数即可进行损伤识别,不论对单一位置损伤,还是多种共存的损伤,均具有损伤定位的能力,并能定性反映损伤程度。与已有的柔度差、柔度差值曲率两种柔度指标的数值模拟比较结果证明了该方法检测损伤的有效性和优越性。The substructure of a frame was isolated from the global structure by applying numerical supporting to the substructure boundary based on the substructure method. Then the damage to the substructure was recognized by the proposed identification method. Numerical simulation examples indicate that the damage location and severity in structures, whether a single damage or multiple ones, can be detected efficiently by MFCD through only a few lower order modal parameters. Compared with the aforementioned flexibility indicators such as a change in flexibility and flexibility differential curvature method, MFCD was proved to be effective and advantageous.

关 键 词：损伤识别 子结构 柔度矩阵 模态柔度曲率差 

分 类 号：TU311[建筑科学—结构工程] TB123[理学—工程力学]