摘要
为了解决输电塔结构的损伤识别问题,提出了基于模态应变能变化率和能量方程的两步识别方法。首先利用模态应变能变化率方法进行较为精确的损伤定位,然后引入损伤后的单元刚度矩阵,对结构模态应变能耗散率理论进行了相关的改进研究,从而推导出更精确的损伤定量方程方法。该方法只需要前几阶振型模态,不需要完备的测量信息。数值仿真的结果表明,该两步识别方法可以有效地识别出输电塔结构的损伤位置和程度。
In order to solve the structural damage identification problem of transmission tower,a two-step identification method based on change rate and dissipation rate of modal strain energy is proposed.The damage location is identified by the change rate of modal strain energy method.Then,the modal strain energy dissipation rate theory is analyzed further by using the element stiffness matrix after injury.As a result,a more accurate damage quantification equation method is introduced.This method requires only several modals of vibration.The numerical simulation results show that this two-step method can find the damage location and damage degree of transmission towers effectively.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第12期94-99,共6页
Journal of Chongqing University
基金
重庆市科委自然科学基金计划资助项目(CSTC2010BB4208)
关键词
损伤检测
应变能
变化率
耗散率
输电塔
damage detection
strain energy
change rates
dissipation rates
transmission tower
