基于残余力向量的桁架梁损伤识别研究

定义残余力向量为结构的损伤指标,给出了根据结构特征值方程详细推导残余力向量的理论过程.并以简支桁架梁为研究对象,利用残余力向量进行桁架梁的局部损伤识别,成功识别出桁架梁的单一和多处局部损伤;同时考虑实际测量中存在噪声影响,引入了损伤定位指数,分析了噪声对损伤识别精度的影响.理论分析和数值仿真结果表明,残余力向量能有效识别桁架梁的局部中小损伤,且有较好的抗噪性.

DAMAGE RECOGNITION OF TRUSS STRUCTURE BASED ON RESIDUAL FORCE VECTOR

In this paper, we define the residual force vector as a structure damage index,and give the detailed theoretical derivation for residual force vector according to the structure eigenvalue equation.Takinga simple supported truss as a research target, we carry the local damage identification of truss by use of residual force vector,and identify the single and multiple local damage of truss structure.We further explore the impact of noise on the accuracy of damage identification by introducing damage localization index and considering the existence of noise in actual measurements. Theoretical analysis and numerical results show that the residual force vector can identify local small damage of the truss structure beam effectively and have good noise immunity.