一种结构损伤评估的两阶段法研究

结构损伤会引起结构动力特性的改变，这种改变可以用模态参数和结构参数表示。文中将柔度投影法和遗传算法相结合，提出一种基于不完整模态数据的结构损伤定位和定量评估的两阶段法。第一阶段，用柔度投影法进行损伤定位，并进行深入分析。第二阶段，用遗传算法确定损伤程度。文中提出一种用于遗传搜索的新的目标函数形式。最后，用一六跨平面桁架桥模型进行数值模拟，验证文中所提方法的有效性。

STUDY ON A TWO-STAGE PROCEDURE FOR STRUCTURAL DAMAGE ASSESSMENT

Damage in the structure alters its dynamic characteristics. The change can be represented in terms of either the modal parameters or the structural parameters. A two-stage procedure of evaluation of the localization and quantification of the structural damage based on flexibility projection procedure and a genetic algorithm using incomplete modal data is presented. Firstly, the flexibility projection procedure was employed to localize the damage. Secondly, the genetic algorithm(GA) was employed to quantify the damage extent to improve the efficiency, in which a new formulation of the objective function for genetic search is presented. Results of illustrative examples of a six-bay plane truss bridge model are given in order to demonstrate the effectiveness of the proposed procedure.