Journal ArticleDOI
Changes in dynamic characteristics of Lorca RC buildings from pre- and post-earthquake ambient vibration data
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TLDR
In this article, the fundamental translational period and damping ratio parameters of a set of low-to-medium-rise buildings in Lorca town (SE of Spain) affected by the May 11th, 2011 earthquake were estimated using the Fast Fourier Transform and the Randomdec technique.Abstract:
This paper estimates fundamental translational period and damping ratio parameters and examines the changes in dynamic characteristics of a set of low-to-medium rise buildings in Lorca town (SE of Spain) affected by the May 11th, 2011 earthquake. These building parameters have been calculated analysing structural dynamic response from ambient vibration measurements recorded at top RC buildings pre- and post earthquake, using the Fast Fourier Transform and the Randomdec technique. The empirical expression relating period $$(T)$$
and number of floor $$(N)$$
here obtained analysing ambient noise recorded on 59 healthy buildings before the earthquake is $$T= (0.054\pm 0.002)\, N$$
, very similar to others empirical period–height relationships obtained for RC structures in the European built environment but quite different from code provisions. Measurements performed in 34 damaged buildings show a period elongation after the quake according to $$T^{*} =(0.075\pm 0.002)\,N$$
expression. Moreover, we found a rise of the fundamental period with the EMS’s grade of damage of buildings. In contrast to natural frequency, damping ratio $$(\xi )$$
do not shows a significant variation with earthquake damage degree and the product $$\xi \, T$$
remains near constant.read more
Citations
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Assessment of a monumental masonry bell-tower after 2016 Central Italy seismic sequence by long-term SHM
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TL;DR: The Sendai Framework for Disaster Risk Reduction 2015-2030 (SFDRR) highlights the importance of scientific research, supporting the availability and application of science and technology to decision-making in disaster risk reduction.
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Data‐driven post‐earthquake rapid structural safety assessment
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References
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Journal ArticleDOI
Detection of structural damage through changes in frequency: a review
TL;DR: The use of natural frequency as a diagnostic parameter in structural assessment procedures using vibration monitoring is discussed in this paper, based on the fact that natural frequencies are sensitive indicators of structural integrity.
Book
Designer's guide to EN 1998-1 and en 1998-5 Eurocode 8: Design of structures for earthquake resistance; general rules, seismic actions, design rules for buildings, foundations and retaining structures/ M.Fardis[et al.]
TL;DR: In this article, the authors present a set of structural and structural design rules for concrete and steel-concrete buildings with respect to the effects of seismic action on fixed base and isolated base.
Journal ArticleDOI
Vibration–based structural damage identification
TL;DR: Current research regarding feature selection and statistical model development will be emphasized with the application of vibration–based damage detection to a large–scale laboratory structure.
Journal ArticleDOI
Period formulas for moment-resisting frame buildings
Rakesh K. Goel,Anil K. Chopra +1 more
TL;DR: In this paper, a regression analysis of the measured period data is used to estimate the fundamental vibration period of reinforced concrete (R/C) and steel moment-resisting frame buildings.
Journal ArticleDOI
Damping Evaluation Using Full-Scale Data of Buildings in Japan
TL;DR: In this paper, the authors describe damping ratio characteristics of steel-framed buildings and reinforced concrete (RC/SRC) buildings based on analyses of the database, including effects of several building factors.