【摘要】 利用试验获得的一阶模态参数 ,提出了一种桁架结构损伤识别的柔度阵法。应用有限元方法 ,采用柔度阵 ,建立结构振动特征方程。结构损伤后 ,引起柔度阵发生改变 ,从结构振动特征方程出发 ,对柔度矩阵做关于结构物理参数变化量的一阶泰勒展开 ,可以确定结构物理参数的变化量 ,识别结构损伤部位及损伤程度。通过一个桁架结构损伤识别的数值模拟证明了该方法的有效性更多还原

【Abstract】 The flexibility matrix method for damage identification of truss structure is suggested in this paper. The first modal parameters obtained by dynamic measuring are needed only in this method. The finite\|element method is used to formulate the eigen\|equation of truss in flexibility matrix form. The flexibility of truss bars would be changed if the damage is occurred in any of these bars, then the physical parameters of the truss can be derived by expressing the changes of flexibility as the first\|order term in the Taylor series expansion of flexibility. Thus, the damaged rods of the truss and degree of the damage can be identified. The effectiveness of this approach is verified by a numerical example.更多还原