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| Titel |
A novel HVSR approach on structural heath monitoring for structural vulnerability assesement |
| VerfasserIn |
Fragkiskos P. Pentaris, Ilias Papadopoulos |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091078
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| Publikation (Nr.) |
 EGU/EGU2014-5347.pdf |
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| Zusammenfassung |
| This work suggests a novel approach for vulnerability assessment in structural health
monitoring (SHM) through Horizontal to Vertical Spectral Ratio (HVSR) method.
Acceleration recordings of different age concrete buildings [1] are analyzed using the
conventional method for estimation of fundamental frequency in SHM (Fast Furrier
Transform-FFT method). The results of frequency spectrum are verified theoretically (mass
and stiffness matrices models) but also by practical techniques applied in real structure data,
for the estimation of structural resonance frequencies [2-4]. The same recordings
are analyzed by HVSR method and study the differences and the similarities of
both methods (FFT and HVSR) under earthquake excitation. Both methods can
reveal resonance frequencies and amplitude of buildings under study, with great
detail and efficiency in terms of ease of deployment, computation, cost and time.
Furthermore HVSR recordings of strong seismic motion are compared with HVSR
recordings of ambient noise for the case study buildings. The similarities of HVSR
recordings (between earthquake and ambient noise) reveal the same analogy in HVSR
spectrum. This enables a simple HVSR noise recording in a building to present the
same information with an earthquake HVSR recording that are much rarer. This
study presents a novel index which compute the increase of HVSR between floors
and correlates the increasing rate with the structural vulnerability of the specific
building. The main idea is that this HVSR rate index is strongly related with the
differential acceleration (between floors), a determinant measurement for SHM
assessment in concrete buildings. Experimental data verify the above HVSR rise index by
presentation of higher HVSR rise in older buildings (with visible cracks in beams,
damage and stress in their structure) than other younger buildings without any visible
damage.
Acknowledgments
This work was supported in part by the ARCHEMEDES III Program of the Ministry of
Education of Greece and the European Union in the framework of the project entitled
«Interdisciplinary Multi-Scale Research of Earthquake Physics and Seismotectonics at the
front of the Hellenic Arc (IMPACT-ARC) ».
References
[1] F. P. Pentaris, J. Stonham, and J. P. Makris, "A review of the state-of-the-art of
wireless SHM systems and an experimental set-up towards an improved design," presented at
the EUROCON, 2013 IEEE, Zagreb, 2013.
[2] R. Ditommaso, M. Mucciarelli, S. Parolai, and M. Picozzi, "Monitoring the structural
dynamic response of a masonry tower: Comparing classical and time-frequency analyses,"
Bulletin of Earthquake Engineering, vol. 10, pp. 1221-1235, 2012.
[3] Sungkono, D. D. Warnana, Triwulan, and W. Utama, "Evaluation of Buildings
Strength from Microtremor Analyses " International Journal of Civil & Environmental
Engineering IJCEE-IJENS, vol. 11, 2011.
[4] L.-L. Hong and W.-L. Hwang, "Empirical formula for fundamental vibration periods
of reinforced concrete buildings in Taiwan," Earthquake Engineering & Structural Dynamics,
vol. 29, pp. 327-337, 2000. |
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