Output-only damage diagnosis for plan-symmetric buildings with asymmetric damage using modal flexibility-based deflections

2020 ◽  
Vol 207 ◽  
pp. 110015
Author(s):  
Giacomo Bernagozzi ◽  
Carlos E. Ventura ◽  
Saeid Allahdadian ◽  
Yavuz Kaya ◽  
Luca Landi ◽  
...  
Keyword(s):  
Damage Diagnosis ◽  
Modal Flexibility ◽  
Output Only

Output-only damage detection in buildings using proportional modal flexibility-based deflections in unknown mass scenarios

2018 ◽  
Vol 167 ◽  
pp. 549-566 ◽  
Author(s):  
Giacomo Bernagozzi ◽  
Suparno Mukhopadhyay ◽  
Raimondo Betti ◽  
Luca Landi ◽  
Pier Paolo Diotallevi
Keyword(s):  
Damage Detection ◽  
Modal Flexibility ◽  
Output Only

scholarly journals Application of modal flexibility-based deflections for damage diagnosis of a steel frame structure

2017 ◽  
Vol 199 ◽  
pp. 2026-2033 ◽  
Author(s):  
G. Bernagozzi ◽  
C.E. Ventura ◽  
S. Allahdadian ◽  
Y. Kaya ◽  
L. Landi ◽  
...  
Keyword(s):  
Steel Frame ◽  
Frame Structure ◽  
Damage Diagnosis ◽  
Modal Flexibility ◽  
Steel Frame Structure

Experimental and numerical studies on a test method for damage diagnosis of stay cables

2016 ◽  
Vol 20 (2) ◽  
pp. 245-256 ◽  
Author(s):  
Yonghui An ◽  
Yue Zhong ◽  
Yanbin Tan ◽  
Jinping Ou
Keyword(s):  
Damage Index ◽  
Test Method ◽  
Frequency Change ◽  
Stay Cable ◽  
Damage Diagnosis ◽  
Model Free ◽  
Stay Cables ◽  
Steel Bar ◽  
Diagnosis Method ◽  
Output Only

To diagnose the state of stay cables, a vibration-based model-free damage diagnosis method of stay cables using the changes in natural frequencies is further proposed and validated. The structural frequency is rapidly and easily acquired; moreover, it is simple and reliable for damage diagnosis. The frequency would change after the stay cable is damaged, so the frequency change could be used as the damage index. However, the stay cables are very long in long-span cable-stayed bridges, and their frequencies are very small; the frequency change due to small damage of the stay cable would be submerged by the surrounding noise and error of parameter identification process. A temporary diagonal steel bar–based method is used to solve this issue. The steel bar is installed with one end on the stay cable close to the bottom anchor head and the other end on the bridge deck; thus, the stay cable is divided into a short part and a long part by the steel bar. The frequency of a stay cable with a given tension force increases with the decrease in its length; according to the qualitative analysis, the frequency of the short part increases dramatically, and the local frequency change of the short part due to the same damage in the whole stay cable is amplified dramatically; thus, the small damage of a stay cable can be diagnosed easily. Numerical simulations of a stay cable selected from a cable-stayed bridge and a laboratorial stay cable are used to validate the method and also give a recommended rule for design of the temporary diagonal steel bar; experimental validation has also been conducted. All the results indicate that the proposed method works very well in damage diagnosis of stay cables. The proposed method is an output-only, model-free, fast and economical damage diagnosis method for stay cables.

scholarly journals Parametric reduced order models for output-only vibration-based crack detection in shell structures

2022 ◽  
Vol 162 ◽  
pp. 108051
Author(s):  
Konstantinos Agathos ◽  
Konstantinos E. Tatsis ◽  
Konstantinos Vlachas ◽  
Eleni Chatzi
Keyword(s):  
Crack Detection ◽  
Shell Structures ◽  
Reduced Order Models ◽  
Reduced Order ◽  
Output Only

Output-only Based Identification of Modal Parameters of Linear and Nonlinear Structures by Wavelet Transform

2021 ◽  
Vol 19 (01) ◽  
pp. 124-131
Author(s):  
Danilo D. Tannus ◽  
Diego D. G. B. Cruz ◽  
Oscar A. Z. Sotomayor
Keyword(s):  
Wavelet Transform ◽  
Modal Parameters ◽  
Nonlinear Structures ◽  
Linear And Nonlinear ◽  
Output Only

Output-only modal analysis for non-synchronous data using stochastic sub-space identification

2021 ◽  
Vol 230 ◽  
pp. 111702
Author(s):  
Lin-Jun Lu ◽  
Hua-Fei Zhou ◽  
Yi-Qing Ni ◽  
Fei Dai
Keyword(s):  
Modal Analysis ◽  
Output Only

Structural Damage Assessment Using Output-Only Measurement: Localization and Quantification

2013 ◽  
Author(s):  
Chin-Hsiung Loh ◽  
Min-Hsuan Tseng ◽  
Shu-Hsien Chao
Keyword(s):  
Damage Detection ◽  
Damage Assessment ◽  
Structural Damage ◽  
Damage Identification ◽  
Model Updating ◽  
Null Space ◽  
Singular Spectrum Analysis ◽  
Damage Index ◽  
Computation Efficiency ◽  
Output Only

One of the important issues to conduct the damage detection of a structure using vibration-based damage detection (VBDD) is not only to detect the damage but also to locate and quantify the damage. In this paper a systematic way of damage assessment, including identification of damage location and damage quantification, is proposed by using output-only measurement. Four level of damage identification algorithms are proposed. First, to identify the damage occurrence, null-space and subspace damage index are used. The eigenvalue difference ratio is also discussed for detecting the damage. Second, to locate the damage, the change of mode shape slope ratio and the prediction error from response using singular spectrum analysis are used. Finally, to quantify the damage the RSSI-COV algorithm is used to identify the change of dynamic characteristics together with the model updating technique, the loss of stiffness can be identified. Experimental data collected from the bridge foundation scouring in hydraulic lab was used to demonstrate the applicability of the proposed methods. The computation efficiency of each method is also discussed so as to accommodate the online damage detection.

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