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Structural Engineering and Mechanics Volume 87, Number 6, September25 2023 , pages 555-574 DOI: https://doi.org/10.12989/sem.2023.87.6.555 |
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Experimental and numerical structural damage detection using a combined modal strain energy and flexibility method |
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Seyed Milad Hosseini, Mohamad Mohamadi Dehcheshmeh and Gholamreza Ghodrati Amiri
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| Abstract | ||
| efficient optimization algorithm and damage-sensitive objective function are two main components in optimization-based Finite Element Model Updating (FEMU). A suitable combination of these components can considerably affect damage detection accuracy. In this study, a new hybrid damage-sensitive objective function is proposed based on combining two different objection functions to detect the location and extent of damage in structures. The first one is based on Generalized Pseudo Modal Strain Energy (GPMSE), and the second is based on the element's Generalized Flexibility Matrix (GFM). Four well-known population-based metaheuristic algorithms are used to solve the problem and report the optimal solution as damage detection results. These algorithms consist of Cuckoo Search (CS), Teaching-Learning-Based Optimization (TLBO), Moth Flame Optimization (MFO), and Jaya. Three numerical examples and one experimental study are studied to illustrate the capability of the proposed method. The performance of the considered metaheuristics is also compared with each other to choose the most suitable optimizer in structural damage detection. The numerical examinations on truss and frame structures with considering the effects of measurement noise and availability of only the first few vibrating modes reveal the good performance of the proposed technique in identifying damage locations and their severities. Experimental examinations on a six-story shear building structure tested on a shake table also indicate that this method can be considered as a suitable technique for damage assessment of shear building structures. | ||
| Key Words | ||
| damage detection; finite element model updating; generalized flexibility matrix; modal strain energy; optimization algorithm | ||
| Address | ||
| Seyed Milad Hosseini: School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran Mohamad Mohamadi Dehcheshmeh: Department of Civil Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran Gholamreza Ghodrati Amiri: Natural Disasters Prevention Research Center, School of Civil Engineering, Iran University of Science & Technology, Tehran, Iran | ||