Ambient vibration testing of existing buildings: Experimental, numerical and code provisions

Mirtaheri, Masoud; Salehi, Fatemeh

doi:10.1177/1687814018772718

Cited by 15 publications

(9 citation statements)

References 17 publications

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“…The accelerometers used in this experiment were Novinpardaz sensors with a sensitivity of 0.01 g. These sensors were first calibrated by measuring the natural frequency of the benchmark frame as shown in Figure 6a. The actual natural frequency of the benchmark frame was already reported in several studies to be 4.12 Hz [35]. The corresponding results of the accelerometer used in this study show a frequency of 4.07 Hz (i.e., only 1% error).…”

Section: Verificationsupporting

confidence: 61%

Vibration Anatomy and Damage Detection in Power Transmission Towers with Limited Sensors

Mohammadi

Mirtaheri

Salkhordeh

et al. 2020

Sensors

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This study presents a technique to identify the vibration characteristics in power transmission towers and to detect the potential structural damages. This method is based on the curvature of the mode shapes coupled with a continuous wavelet transform. The elaborated numerical method is based on signal processing of the output that resulted from ambient vibration. This technique benefits from a limited number of sensors, which makes it a cost-effective approach compared to others. The optimal spatial location for these sensors is obtained by the minimization of the non-diagonal entries in the modal assurance criterion (MAC) matrix. The Hilbert–Huang transform was also used to identify the dynamic anatomy of the structure. In order to simulate the realistic condition of the measured structural response in the field condition, a 10% noise is added to the response of the numerical model. Four damage scenarios were considered, and the potential damages were identified using wavelet transform on the difference of mode shapes curvature in the intact and damaged towers. Results show a promising accuracy considering the small number of applied sensors. This study proposes a low-cost and feasible technique for structural health monitoring.

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Section: Verificationsupporting

confidence: 61%

Vibration Anatomy and Damage Detection in Power Transmission Towers with Limited Sensors

Mohammadi

Mirtaheri

Salkhordeh

et al. 2020

Sensors

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“…The advancement of seismic equipment and the development of a methodological base have led to the passive seismic methods and ambient vibration testing becoming increasingly important in structural health and safety monitoring [10][11][12][13][14]. If, for some passive seismic methods that are based on The advancement of seismic equipment and the development of a methodological base have led to the passive seismic methods and ambient vibration testing becoming increasingly important in structural health and safety monitoring [10][11][12][13][14]. If, for some passive seismic methods that are based on the cross-correlation or convolution of ambient noise, a high level of microseisms is necessary [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Hydropower Dam State and Its Foundation Soil Survey Using Industrial Seismic Oscillations

et al. 2019

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In this article, we suggest a new type of seismic source for surveying both structure state and foundation soil conditions regardless of the level of seismic noise. In our opinion, powerful industrial equipment can be treated as seismic sources. We describe the results of a survey conducted on the Song Tranh-2 hydropower dam located in Central Vietnam. After a М = 4.7 earthquake, the dam visual inspection revealed zones of the excessive durability loss: cracks and areas with an elevated infiltration of water into the dam galleries. Powerful industrial equipment generates continuous quasi-harmonic mechanical oscillations (seismic waves) that travel through layers of rocks. These seismic oscillations are recorded by receivers in different measurement points such as the dam body, abutments, and the foundation soils. Anomalous amplitudes of these oscillations indicate the presence of weakened zones in the structure or in foundation soil. We coupled passive and active seismic methods to more precisely find such zones. In this case, active seismic methods allowed us to investigate dam abutment zones, and passive seismic methods were used to localize weakened zones in the dam-foundation soil system. We assumed that the joint contribution of two factors was the cause of the dam weakening. One of them was caused by increased water infiltration through the rock mass and its contact zones, and the other was reservoir-induced seismicity contributing to the deterioration of the foundation soils, which was possibly the reason for a shift in the dam in the contact zone with the rock mass foundation. It is necessary to perform computer modelling, which was not included in our research. The developed method can be used for the safety control of the hydropower station dams.

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“…16 existing buildings are being studied, a brief description of the characteristics of the buildings is shown by M. Mirteheri (2018) [50].…”

Section: Buildings In Iran -Geomorphological Zone IImentioning

confidence: 99%

Soil foundation and structure interaction effects on the estimating of fundamental period of instrumented buildings

Torkia¹,

Maalem²,

Noureddine³

2020

Preprint

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The aim of this paper is to propose new expressions for fundamental period of reinforced concrete buildings which takes into account of soil foundation and structure interaction SFSI effects and its variation of 215 existing buildings located in the USA, Europe and Asia. Diagrams representing empirical relationship between fundamental period-height in most recent research and building codes. No difference was observed in the value of period T as a result of degradation of the soil bearing capacity in this ranges. It is incorrect to present a single equation or a single diagram for different geotechnical conditions. To evaluate SFSI effects, simplified SFSI modal described in this work using on Van nuys building-VN7SH and are compared with those obtained by different authors. In order to developed a simplifieds equations for estimating fundamental periods of vibration for 03 geomorphological sites, 40 existing buildings recorded over a period of 24 years located in the sites of California are utilized, that encompass a wide range of structural and geotechnical conditions. On the other hand,175 more buildings used from Europe and Asia exposed to earthquake actions were examined to evaluate the accuracy of the relationship.A collective examination of the empirical, measured and procedures show that the fundamental period is fonction of to the building overall height H estimated on empirical formulas provided by earthquake design codes used for buildings under SFSI conditions effects under certain circumstances, underestimate the real response of the structures. The results reveal the effects of SFSI due to an earthquake recorded motion on the response of buildings depends mainly on the soil mass amplification, as well as secondary influences from type, shape and inertia of foundation.

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Ambient vibration testing of existing buildings: Experimental, numerical and code provisions

Cited by 15 publications

References 17 publications

Vibration Anatomy and Damage Detection in Power Transmission Towers with Limited Sensors

Vibration Anatomy and Damage Detection in Power Transmission Towers with Limited Sensors

Hydropower Dam State and Its Foundation Soil Survey Using Industrial Seismic Oscillations

Soil foundation and structure interaction effects on the estimating of fundamental period of instrumented buildings

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