Modal mass estimation from ambient vibrations measurement: A method for civil buildings

Acunzo, Gianluca; Fiorini, N.; Mori, Federico; Spina, Daniele

doi:10.1016/j.ymssp.2017.05.014

Cited by 29 publications

(13 citation statements)

References 9 publications

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“…In this context, that is ambient noise monitoring in buildings, most of the time the recording of the signals is carried out in situ, with seismographs that record the signal in the internal memory. Once the measurements have been completed, the data are recovered individually from each of the seismographs used, either by connecting a computer to them or by copying the memory cards one by one [ 1 , 11 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Wireless Sensor Network for Seismic Monitoring of Buildings

Jornet-Monteverde

Galiana-Merino

Soler-Llorens

2021

Sensors

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This article presents a new wireless seismic sensor network system, especially design for building monitoring. The designed prototype allows remote control, and remote and real-time monitoring of the recorded signals by any internet browser. The system is formed by several Nodes (based on the CC3200 microcontroller of Texas Instruments), which are in charge of digitizing the ambient vibrations registered by three-component seismic sensors and transmitting them to a central server. This server records all the received signals, but also allows their real-time visualization in several remote client browsers thanks to the JavaScript’s Node.js technology. The data transmission uses not only Wi-Fi technology, but also the existing network resources that nowadays can be found usually in any official or residential building (lowering deployment costs). A data synchronization scheme was also implemented to correct the time differences between the Nodes, but also the long-term drifts found in the internal clock of the microcontrollers (improving the quality of records). The completed system is a low-cost, open-hardware and open-software design. The prototype was tested in a real building, recording ambient vibrations in several floors and observing the differences due to the building structure.

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Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Wireless Sensor Network for Seismic Monitoring of Buildings

Jornet-Monteverde

Galiana-Merino

Soler-Llorens

2021

Sensors

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“…Structures of different materials tend to oscillate at these frequencies with a motion pattern defined as the normal mode. The natural frequencies and vibration of structures have been investigated and reported in the literature [1]. Vibrations of structures depend on its mass and stiffness.…”

Section: Introductionmentioning

confidence: 99%

Determination of Different Structures’ Materials Natural Frequencies using Fuzzy Logic System

Lashin,

Saleh,

Alrowais

2020

IJEAT

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The impact of structure's material and dimensions on its natural frequency are lacking in recent literature. The main aim of that paper is investigating material' characteristics effect on structures natural frequency. Five different types of materials (steel, concrete,wood, plastic and aluminum) which mostly used in engineering applications implemented in this study. A fuzzy system designed and structured for each type of materials. It used to optimize the natural frequency values related to height and area of structure. The results show that whilst the height of the structure is a very influential factor on its natural frequency, the type of material as well as area of the structure are also effective variables . For the same dimensions of the structure, wood shows the highest value of natural frequency, then steel followed by concrete. In addition, the natural frequencies of structures have been assessed against the wind, earthquakes and traffic vibrations. These results can have useful applications and recommendations for engineering and design purposes. Wood can complement natural properties of a range of materials. Implications from this investigation can be useful for heavy machines laboratories, building structures and other engineering applications.

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“…In the framework of the OMA, several approaches have been developed for estimating the modal parameters, that is, natural frequencies, damping ratios, and mode shapes, paying attention to distinguish actual modes from the spurious ones. 4 The problem has been faced both in the frequency and in the time domain. 5 Moreover, the estimation of scaled modal parameters is not an issue of OMA, so the modal mass ratio has to be evaluated in an indirect way using other methods.…”

Section: Introductionmentioning

confidence: 99%

Ambient vibrations for the assessment of the strengthening intervention of a masonry barrel vault

Primio

Fiorini

Spina

et al. 2020

Structural Health Monitoring

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Vibration-based structural monitoring is a fundamental tool to assess the conditions of existing structures, in their real operating state. In particular, as concerns masonry buildings, although a large part of the Italian and European historical heritage is composed of vaulted structures, comparatively few papers in the literature are targeted to the study of the dynamic behavior of vaulted systems. The present work focuses on the application of vibration-based structural monitoring to a barrel vault of the Bussi Castle, located in Pescara, Italy, which suffered some damages as a consequence of the 2009 L’Aquila earthquake. Ambient vibration tests were carried out in the damaged state and after repair and strengthening of the vault for evaluating its dynamic behavior in both states. In either conditions, the modal parameters of the vault were identified using operational modal analysis techniques. The comparison of the modes in the two states, carried out with Modal Assurance Criterion index, clearly indicates an enhancement of dynamic behavior of the consolidated vault. In particular, a new index named Modal Symmetry Index is introduced. The index is based on a proper ratio between mode shapes to evaluate the improvement of the structural symmetry after the restoration interventions. The results confirm the effectiveness of the devised index to evaluate the strengthening interventions and, the potential of the structural monitoring to control the behavior of damaged vaulted masonry systems.

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Modal mass estimation from ambient vibrations measurement: A method for civil buildings

Cited by 29 publications

References 9 publications

Design and Implementation of a Wireless Sensor Network for Seismic Monitoring of Buildings

Design and Implementation of a Wireless Sensor Network for Seismic Monitoring of Buildings

Determination of Different Structures’ Materials Natural Frequencies using Fuzzy Logic System

Ambient vibrations for the assessment of the strengthening intervention of a masonry barrel vault

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