Experimental assessment of dynamic and static based stiffness indices for RC structures

This paper presents the results obtained from experimental modal analysis and static load testing to examine the suitability of the dynamic parameters to estimate stiffness deterioration severity in RC structures. The study investigates the accuracy of different dynamic-based stiffness indices compa...

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Main Authors: Fayyadh, Moatasem M., Razak, Hashim Abdul
Format: Article
Published: Elsevier Science Inc 2022
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Online Access:http://eprints.um.edu.my/40734/
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spelling my.um.eprints.407342023-11-14T02:17:18Z http://eprints.um.edu.my/40734/ Experimental assessment of dynamic and static based stiffness indices for RC structures Fayyadh, Moatasem M. Razak, Hashim Abdul TA Engineering (General). Civil engineering (General) This paper presents the results obtained from experimental modal analysis and static load testing to examine the suitability of the dynamic parameters to estimate stiffness deterioration severity in RC structures. The study investigates the accuracy of different dynamic-based stiffness indices compared to static-based flexural and shear stiffness indices and how different damage levels and scenarios impact them. The flexural damage scenario was found to have the weakest effect on stiffness deterioration, indicated by the frequency-based stiffness index, while shear damage at quarter-span has the greatest influence. The frequency-based stiffness index indicates a stiffness increase when the damage level reaches 0.15, which is believed to be related to the composite effect in RC structures, as discussed by Abdul Razak and Fayyadh (2013). The combined modal parameters stiffness index revealed that the flexural damage scenario has the weakest influence on stiffness deterioration, while shear damage closer to the support has the highest effect on stiffness deterioration. The main difference between the combined parameters index and the other two dynamic indices is that the combined parameters index detects global stiffness changes through frequency, while the local stiffness changes are detected through the mode shape vectors. The general trend of the dynamic-based indices shows that the MAC-based stiffness index gives the lowest sensitivity for stiffness change for all damage levels, while the combined parameters-based stiffness index gives the highest sensitivity among the dynamic parameters indices to detect the stiffness deterioration for all damage levels. The static-based flexural stiffness index shows lower sensitivity to stiffness deterioration than the static-based shear stiffness index. The static-based stiffness indices show better sensitivity than the dynamicbased indices; however, the static load test is time-consuming, equipment and labour intensive, and causes significant disruptions to the existing use of the structures. Thus, the dynamic parameters-based stiffness indices are more suitable for existing structures. Elsevier Science Inc 2022-11 Article PeerReviewed Fayyadh, Moatasem M. and Razak, Hashim Abdul (2022) Experimental assessment of dynamic and static based stiffness indices for RC structures. Stuctures, 45. pp. 459-474. ISSN 2352-0124, DOI https://doi.org/10.1016/j.istruc.2022.09.051 <https://doi.org/10.1016/j.istruc.2022.09.051>. 10.1016/j.istruc.2022.09.051
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Fayyadh, Moatasem M.
Razak, Hashim Abdul
Experimental assessment of dynamic and static based stiffness indices for RC structures
description This paper presents the results obtained from experimental modal analysis and static load testing to examine the suitability of the dynamic parameters to estimate stiffness deterioration severity in RC structures. The study investigates the accuracy of different dynamic-based stiffness indices compared to static-based flexural and shear stiffness indices and how different damage levels and scenarios impact them. The flexural damage scenario was found to have the weakest effect on stiffness deterioration, indicated by the frequency-based stiffness index, while shear damage at quarter-span has the greatest influence. The frequency-based stiffness index indicates a stiffness increase when the damage level reaches 0.15, which is believed to be related to the composite effect in RC structures, as discussed by Abdul Razak and Fayyadh (2013). The combined modal parameters stiffness index revealed that the flexural damage scenario has the weakest influence on stiffness deterioration, while shear damage closer to the support has the highest effect on stiffness deterioration. The main difference between the combined parameters index and the other two dynamic indices is that the combined parameters index detects global stiffness changes through frequency, while the local stiffness changes are detected through the mode shape vectors. The general trend of the dynamic-based indices shows that the MAC-based stiffness index gives the lowest sensitivity for stiffness change for all damage levels, while the combined parameters-based stiffness index gives the highest sensitivity among the dynamic parameters indices to detect the stiffness deterioration for all damage levels. The static-based flexural stiffness index shows lower sensitivity to stiffness deterioration than the static-based shear stiffness index. The static-based stiffness indices show better sensitivity than the dynamicbased indices; however, the static load test is time-consuming, equipment and labour intensive, and causes significant disruptions to the existing use of the structures. Thus, the dynamic parameters-based stiffness indices are more suitable for existing structures.
format Article
author Fayyadh, Moatasem M.
Razak, Hashim Abdul
author_facet Fayyadh, Moatasem M.
Razak, Hashim Abdul
author_sort Fayyadh, Moatasem M.
title Experimental assessment of dynamic and static based stiffness indices for RC structures
title_short Experimental assessment of dynamic and static based stiffness indices for RC structures
title_full Experimental assessment of dynamic and static based stiffness indices for RC structures
title_fullStr Experimental assessment of dynamic and static based stiffness indices for RC structures
title_full_unstemmed Experimental assessment of dynamic and static based stiffness indices for RC structures
title_sort experimental assessment of dynamic and static based stiffness indices for rc structures
publisher Elsevier Science Inc
publishDate 2022
url http://eprints.um.edu.my/40734/
_version_ 1783876711386972160
score 13.209306