高速铁路钢-混凝土组合梁的损伤识别

以某高速铁路桥梁钢-混凝土结合梁模型为例,模拟多种损伤情况,分别运用以固有频率、振型、曲率模态为识别指标的方法进行损伤识别.通过对模型的无阻尼自由振动分析研究损伤指标与损伤之间的关系;以模型不同部位抗弯刚度的折减模拟不同程度的损伤.研究结果表明,固有频率及振型能反映结构的整体性能,但很难判断损伤位置;曲率模态对局部损伤较为敏感,损伤定位比较准确.

Damage detection of high-speed railway steel - concrete composite beam

Several damage conditions were simulated for a reduced scale modal of a high-speed railway steelconcrete composite beam. Inherent frequency, mode shape and curvature mode were used for damage detection. The relationship between the damage index and damage was studied by the analysis of the modal's undamped free vibration. Various degrees of each damage were simulated by the reduce of flexure resistance in several parts of the modal. The results indicate that the inherent frequency and mode shape can reflect the performance of structure but cannot locate structure damage exactly. Curvature mode is sensitive to the local damage and can exactly locate structure damage.