Variability of the fixed-base and soil-structure system frequencies of a building-The case of Borik-2 building

Trifunac, Mihailo D.; Todorovska, Maria I.; Manić, M.I.; Bulajić, Borko Đ.

doi:10.1002/stc.277

Cited by 47 publications

(38 citation statements)

References 26 publications

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“…The empirical relationship by Goel and Chopra [42], then introduced in several codes including EC8, is based on measurements during earthquakes on buildings that were strongly shaken but not driven into inelastic behaviour. Trifunac et al [44] show for a building in Banja Luka (Bosnia) that for strong shaking without damage, building period increased of 30%. A review paper by Calvi et al reports that substantial damage is obtained both for empirical and numerical estimates when period increases more than 50%.…”

Section: Relationship Between Height and Main Frequency Of Rc Buildingsmentioning

confidence: 99%

Empirical estimate of fundamental frequencies and damping for Italian buildings

Gallipoli

Mucciarelli

Vona

2008

Earthq Engng Struct Dyn

108

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SUMMARYThe aim of this work is to estimate the fundamental translational frequencies and relative damping of a large number of existing buildings, performing ambient vibration measurements. The first part of the work is devoted to the comparison of the results obtained with microtremor measurements with those obtained from earthquake recordings using four different techniques: horizontal-to-vertical spectral ratio, standard spectral ratio, non-parametric damping analysis (NonPaDAn) and half bandwidth method. We recorded local earthquakes on a five floors reinforced concrete building with a pair of accelerometers located on the ground and on top floor, and then collected microtremors at the same location of the accelerometers. The agreement between the results obtained with microtremors and earthquakes has encouraged extending ambient noise measurements to a large number of buildings. We analysed the data with the abovementioned methods to obtain the two main translational frequencies in orthogonal directions and their relative damping for 80 buildings in the urban areas of Potenza and Senigallia (Italy). The frequencies determined with different techniques are in good agreement. We do not have the same satisfactory results for the estimates of damping: the NonPaDAn provides estimates that are less dispersed and grouped around values that appear to be more realistic. Finally, we have compared the measured frequencies with other experimental results and theoretical models. Our results confirm, as reported by previous authors, that the theoretical period-height relationships overestimate the experimental data.

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Section: Relationship Between Height and Main Frequency Of Rc Buildingsmentioning

confidence: 99%

Empirical estimate of fundamental frequencies and damping for Italian buildings

Gallipoli

Mucciarelli

Vona

2008

Earthq Engng Struct Dyn

108

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“…The interest for AV based method has been recently supported by recent papers (e.g., Mucciarelli et al 2004;Dunand et al 2006;Clinton et al 2006) that showed moderate decrease (<30%) of fundamental frequencies between strong (0.5 g) and weak (10 −5 g) motion. Trifunac et al (2008) recently confirmed that the building frequency decreases for strong shaking without significant and resulting damage are below 30%. Boutin et al (2005) also showed how the ratio between the fundamental frequency and harmonics in tall buildings getting from single AV recording at the building top let to fix the dynamic model (e.g., shear, cantilever or Timoshenko beam models).…”

Section: Introductionmentioning

confidence: 86%

Comparison of velocimeter and coherent lidar measurements for building frequency assessment

Guéguen

Jolivet

Michel

et al. 2009

Bull Earthquake Eng

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Over recent years there has been a growing interest in the building frequency analysis for earthquake and structural engineering fields using ambient vibrations. Simultaneously, velocity measurements with LASER remote sensing techniques have gained more interest for several applications. This paper details the comparison of the frequency analysis obtained using sensitive velocimeter sensor and coherent LIDAR (Light Detection and Ranging) sensor, and applied to one RC existing building. Ambient vibrations recordings were processed using the Frequency Domain Decomposition method for defining the frequencies and mode shapes of the building target, while LASER remote sensing approach used coherent LIDAR method for velocity and frequency measurement. The results of the two systems are discussed. A good agreement is observed, which let us conclude on the ability of the coherent LIDAR to assess the frequency of existing buildings for structural and earthquake engineering fields at long range and without any retroreflector on the structure.

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“…A possible explanation for this disagreement could be found in the use of a low energy input source such as the ambient noise. However, different authors (Hong and Hwang 2000;Trifunac et al 2010) observe that the fundamental period of buildings, designed according to the seismic code, also showed a period even much lower than expected during earthquakes. Indeed, we believe that the level of shaking cannot be considered as the only responsible factor for the observed discrepancy between experimental and Eurocode8 (2003) height-period relationships.…”

Section: Built-up Features and Experimental Evaluation Of The Dynamicmentioning

confidence: 93%

Evaluation of building fundamental periods and effects of local geology on ground motion parameters in the Siracusa area, Italy

et al. 2016

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The Siracusa area, located in the southeastern coast of Sicily (Italy), is mainly characterized by the outcropping of a limestone formation. This lithotype, which is overlain by soft sediments such as sandy clays and detritus, can be considered as the local bedrock. Records of ambient noise, processed through spectral ratio techniques, were used to assess the dynamic properties of a sample survey of both reinforced concrete and masonry buildings. The results show that experimental periods of existing buildings are always lower than those proposed by the European seismic code. This disagreement could be related to the role played by stiff masonry infills, as well as the influence of adjacent buildings, especially in downtown Siracusa. Numerical modeling was also used to study the effect of local geology on the seismic site response of the Siracusa area. Seismic urban scenarios were simulated considering a moderate magnitude earthquake (December 13th, 1990) to assess the shaking level of the different outcropping formations. Spectral acceleration at different periods, peak ground acceleration, and velocity were obtained through a stochastic approach adopting an extended source model code. Seismic ground motion scenario highlighted that amplification mainly occurs in the sedimentary deposits that are widespread to the south of the study area as well as on some spot areas where coarse detritus and sandy clay outcrop. On the other hand, the level of shaking appears moderate in all zones with outcropping limestone and volcanics.

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Variability of the fixed-base and soil-structure system frequencies of a building-The case of Borik-2 building

Cited by 47 publications

References 26 publications

Empirical estimate of fundamental frequencies and damping for Italian buildings

Empirical estimate of fundamental frequencies and damping for Italian buildings

Comparison of velocimeter and coherent lidar measurements for building frequency assessment

Evaluation of building fundamental periods and effects of local geology on ground motion parameters in the Siracusa area, Italy

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