摘要：提出一种改进的柔度灵敏度方法用于工程结构损伤识别。通过在迭代算法中引入一个“加速”公式来迅速获得足够精确的识别结果，避免了多次迭代，可以大大减少计算花费。用两个数值算例对所提方法进行了验证，并把结果和原柔度灵敏度方法的计算结果进行比较。结果表明：采用改进的算法一般只需经过一次计算即可获得很高精度的识别结果，而采用原方法必须经过多次迭代才能获得相同精度的识别结果。改进的方法比原方法大大减少了迭代次数，显著减少了计算花费，显示了改进方法的突出优越性。

Abstract: Structural damage identification based on an improved sensitivity technique of structural flexibility is studied in this paper. The drawback of the existing sensitivity methods is discussed firstly and then an improved technique is presented. The most significant contribution of this work is in the development of a simple accelerated formula used in the iteration process. With the introduction of the accelerated formula, the proposed method is able to quantify large damages without any high-order analysis on the flexibility or multi-iterations. The effectiveness of the proposed method is illustrated using simulated data with measurement noise on two numerical examples. The results show that the proposed procedure is economical in computation and is simple to implement. Regardless of whether the damage is small or large, the proposed method can identify both locations and extents of structural damages accurately only using the first iteration. It has been shown that the presented scheme may be useful for structural damage identification.