【作者】 翁顺； 朱宏平；

【Author】 WENG Shun;ZHU Hong-ping;Huazhong University of Science and Technology;

【机构】 华中科技大学土木工程与力学学院；

【摘要】 基于有限元模型修正的结构损伤识别方法计算过程直观、物理意义明确,能同步识别结构损伤位置和损伤程度,是结构损伤评估最直接的依据。本文首先介绍基于有限元模型修正的损伤识别方法基本原理与过程,总结近三十年来有限元模型修正技术的发展。土木工程结构模型复杂性(包含大量单元、节点、待修正参数等)导致有限元模型修正过程效率低,详细介绍了基于子结构有限元模型修正的土木工程损伤识别方法在提高计算效率方面的优势。最后,将两种有限元模型修正方法应用于一栋超高层建筑数值模型的损伤识别,说明两类方法在土木结构损伤识别中的特点。土木工程尺度大而结构损伤通常发生在局部区域,子结构方法将整体结构的分析转换为对若干独立子结构的分析,通过少数局部子结构的模型修正实现损伤识别,避免重复分析大尺寸整体结构,为大型结构基于有限元模型修正的损伤识别开辟高精度和高效率的途径。更多还原

【Abstract】 The finite element model updating is advantageous to be used in damage identification, since it is physically meaningful and identifies the damage location and extent simultaneously. It provides a direct and important basis for structural safety assessment. This paper firstly presents the background and basic process of model updating based damage identification, and summarizes its development in the past thirty years. The finite element model of a civil structure is usually large-scale and there are many parameters to be updated, which makes the model updating process time consuming. In consequence, the substructure based model updating methods are developed to the damage identification of large-scale civil structures, to improve the efficiency of model updating process. Finally, the two methods are applied to the damage identification of a high-rise building model to illustrate their advantages in practical damage assessment. A civil structure is large-scale while the damage is localized. The substructuring method divides the global structure into several independent substructures for analysis. The substructure based damage identification is achieved by updating a few substructures, avoiding repeated analysis of large-sized whole structures, thereby improving the accuracy and efficiency of model updating process.更多还原