基于应变模态的桁架结构损伤识别

摘要

Taking the truss structure as the research object,a simply-supported truss structure is modeled, and damage changes are simulated by reducing the unit stiffness. The nodal displacements are turned into unit strain changes to identify the damage performance of truss structure. The validity of the first-order relative strain model is proved by experiments.%选用桁架结构作为研究对象,对一简支桁架建立仿真模型,通过单元刚度的减小模拟损伤变化,用节点位移转变为单元应变的方法,对桁架结构进行损伤识别.经过试验研究,验证了一阶相对应变模态对结构损伤识别的有效性.