A two-stage damage identification method for a proportional damage structure

被引：0

作者：

Zhao, Jian-Hua ^{[1
]}

Zhang, Ling ^{[1
]}

Sun, Qing ^{[2
]}

机构：

[1] State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an

[2] Department of Civil Engineering, Xi'an Jiaotong University, Xi'an

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2015年 / 34卷 / 13期

关键词：

Least-square techniques; Normalized modal strain energy; Proportional damage model; Robustness; Structural damage identification;

D O I：

10.13465/j.cnki.jvs.2015.13.025

中图分类号：

学科分类号：

摘要：

In order to improve the efficiency of structural multi-damage identification, a two-stage method was presented here for identification and quantification of structural damage. In the first stage, a normalized modal strain energy-based damage index was used to precisely determine damage locations. The modal strain energy was calculated using the measured modal data and element stiffness matrix extracted from a structure's finite element model. In the second stage, a matrix condensation approach in conjunction with a proportional damage model was then employed to derive the equation to quantify the damage level on the basis of a damage location. Subsequently, the least-square technique was used to solve for the unknowns of the damage level. To demonstrate the effectiveness of the proposed approach, numerical simulations were performed for a six-bay planar truss structure. The simulation results indicated that the proposed method is capable of identifying locations and levels of damage accurately with a stronger robustness. ©, 2015, Chinese Vibration Engineering Society. All right reserved.

引用

页码：146 / 151

页数：5

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