Change of Natural Frequency of Low-Rise Buildings Based on Long-Term Vibration Records

Hatakeyama, Tomoki; Wang, Xing; Ohno, Susumu; Motosaka, Masato

doi:10.5610/jaee.18.3_15

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Figure 3 also shows the 10-day averages of temperature 14) at the Japan Meteorological Agency (JMA) Edogawa seaside station (approximately 7 km east-southeast of the subject structure), indicating that the natural period tends to shorten as the average temperature increases. Therefore, the same trend was observed in these buildings as in previous studies 1), 3) . The graphs on the right side of Fig.…”

Section: Change Over Time Of Natural Period Of Each Building Using Lo...supporting

confidence: 90%

“…The use of microtremors allows continuous monitoring of changes in the vibration characteristics of the structure. For example, Okamoto et al 1) and Hatayama et al 3) monitored a super high-rise steel structure building and a three-story steel structure building, respectively, using microtremor and seismic records. They reported that the natural frequencies showed seasonal variations and that there was a positive correlation between the natural frequencies and air temperature.…”

Section: Introductionmentioning

confidence: 99%

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Change in Dynamic Characteristics of Base-Isolated Buildings With Irregular Shape Based on Long-Term Vibration Records

KONNO,

TOYODA

2023

Journal of JAEE

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Long-term structural health monitoring is conducted on the Toyosu campus of Shibaura Institute of Technology. The buildings are installed with accelerometer sensors and incorporated with base isolation devices, which are also installed in the ground. The fast Fourier transform (FFT) was used to analyze the microtremor records for nine years. The result shows a negative correlation between temperature and the natural period of the buildings, and the periods have increased by approximately 5% since the 2011 off the Pacific coast of Tohoku Earthquake. The auto-regressive exogenous (ARX) model was used to analyze the earthquake records. The result shows that the natural period and damping ratio of buildings are dependent on the amplitude of vibration. The periods have increased by 6%-10% due to the abovementioned earthquake, but the damping ratios have not changed.

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Section: Change Over Time Of Natural Period Of Each Building Using Lo...supporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Change in Dynamic Characteristics of Base-Isolated Buildings With Irregular Shape Based on Long-Term Vibration Records

KONNO,

TOYODA

2023

Journal of JAEE

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“…For example, Guillier et al (2016) found that the natural frequency of a 3.5-story reinforced concrete (RC) building may increase due to increase in temperature up to about 3.5%. Hatakeyama et al (2018) compared such variations for 3-story RC and steel buildings and found that, for the steel building, the variations were much smaller than those for the RC building. We note that the temperature effects occur concurrently with the operational conditions, such as the amplitude of response, and with other weather conditions, such as humidity and rainfall, and may be difficult to separate reliably.…”

Section: Thermal Effectsmentioning

confidence: 99%

“…The operating conditions include, for example, the amplitude of the response, with the mechanism of the effect being the nonlinear elastic behavior of the structure, soil, and soil-structure system, such as opening and closing of cracks in concrete, softening of the soil, and effective lengthening of the structure caused by the formation of gaps between the foundation and the soil (Ebrahimian et al, 2017;Kashima, 2017;Trifunac et al, 2001aTrifunac et al, , 2001bUdwadia and Trifunac, 1973). The environmental conditions include, for example, the air temperature, humidity, and heavy rainfall, which may affect the properties of the structural material and structural system, and the properties of the soil and the soil-foundation-structure system (Clinton et al, 2006;Guillier et al, 2016;Han et al, 2021;Hatakeyama et al, 2018;Herak and Herak, 2010;Ramı´rez et al, 2022;Todorovska and Al Rjoub, 2006;Yuen and Kuok, 2010). The effects of these conditions on the damage-sensitive parameters may be possible to eliminate or reduce in the future by developing reliable predictive models and methods for correction.…”

Section: Introductionmentioning

confidence: 99%

Variability in parameter estimation for a tall steel-frame building

Rahmani,

Barjani,

Todorovska

2023

Earthquake Spectra

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The between-event variability in identified shear wave velocities of fitted four-layer beam models in the response of a 54-story steel-frame building during nine earthquakes over a period of 27 years (1992–2019) is investigated. Recorded response and simulated response by its digital twin (linear finite element model with fixed base) were used as input, that is, the real structure and its digital twin were identified. Two surrogate models were fitted, a Timoshenko beam and a shear beam. The waveform inversion of impulse response functions method, developed earlier by the authors, was used to fit the beam models. The coefficients of variation (C.V.) of the between-events variability in the wave velocity estimates of the four layers were analyzed and compared for the different cases of data (real structure versus digital twin), different surrogate models, and different locations on the floor where the motions were observed. The results showed that the variability of the digital twin was affected by the contamination of the response by torsion, which is not accounted for in the beam models, by the degree of geometric regularity of the structure and by how closely the beam model represented the nature of the building deformation (balance of shear and bending deformation). These effects were minor in comparison to the nonlinear effects (recoverable nonlinearity and permanent stiffness degradation), which were not present in the digital twin response. The C.V. for the real structure (about 3%–5%) was comparable for both beam models fitted.

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“…Evaluating the changes of dynamic properties (eg., natural frequencies) of structures under the ground motion can indicate potential damages or deterioration of structural components. However, natural frequencies are easily to be wandering by environmental factors, such as temperature [1]. Seismic response of buildings can be regarded as wave propagation in the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Wavefield character in high rise building under earthquake shake and CNN based damage detection

Zhang

2023

Materials Research Proceedings

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Abstract. Vibration of buildings can be regarded as the wave propagation in the vertical direction. Stiffness deterioration of structures due to damages could be altered by the changes in velocity and attenuation of the traveling waves. Previous studies have proposed methods to construct a new wavefield from the original wavefield of the building, in which the propagation path of the waves can be more easily recognized. In this study, firstly, we construct the wavefield with the virtual source at the top of the building (deconvolved wave), which consist of one acausal up-going wave and one causal down-going wave. Then, the changes of deconvolved waves over time at the base and inter floors are visualized. Finally, the CNN is constructed to automatically recognize the change of the visualized wavefield. To generate training data of the CNN model, multivariate nonlinear vibration simulation, reconstruction of the wavefield and visualization of the wavefield based on the vibration data was performed. To validate the trained CNN, the data of a shake table test on a 1/3 scaled 18-story steel frame building is used. As the damage progresses, the changes in the wavefield are recognized.

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Change of Natural Frequency of Low-Rise Buildings Based on Long-Term Vibration Records

Cited by 5 publications

References 7 publications

Change in Dynamic Characteristics of Base-Isolated Buildings With Irregular Shape Based on Long-Term Vibration Records

Change in Dynamic Characteristics of Base-Isolated Buildings With Irregular Shape Based on Long-Term Vibration Records

Variability in parameter estimation for a tall steel-frame building

Wavefield character in high rise building under earthquake shake and CNN based damage detection

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