scholarly journals Electrical modelling of carbon nanotube cement-based sensors for structural dynamic monitoring

2014 ◽  
Author(s):  
Antonella D'Alessandro ◽  
Filippo Ubertini ◽  
Annibale Luigi Materazzi ◽  
Maurizio Porfiri
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Monitoring ◽  
Structural Dynamic ◽  
Electrical Modelling

Optical Fiber Accelerometer System for Structural Dynamic Monitoring

2009 ◽  
Vol 9 (11) ◽  
pp. 1347-1354 ◽  
Author(s):  
P.F. da Costa Antunes ◽  
H.F.T. Lima ◽  
N.J. Alberto ◽  
H. Rodrigues ◽  
P.M.F. Pinto ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Dynamic Monitoring ◽  
Structural Dynamic

scholarly journals Fast Dynamic Control of Damaged Historical Buildings: A New Useful Approach for Structural Health Monitoring after an Earthquake

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Sergio Vincenzo Calcina ◽  
Luca Piroddi ◽  
Gaetano Ranieri
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Conservation Status ◽  
Dynamic Control ◽  
Dynamic Monitoring ◽  
Damage State ◽  
Structural Dynamic ◽  
Damage Level ◽  
Structural Health ◽  
Material State

The structures damage conditions assessment requires numerous precautions to ensure the safety of people during site visits and inspections. Among several methods providing useful information about the conservation status of the structures, dynamic monitoring techniques are suitable to retrieve the global behavior of the buildings. The anomalous features diagnosis of the structural dynamic response is an index of alterations of the material state and, in the worst cases, is related to the presence of damaged structural elements. This paper proposes the use of remote control systems for the structural evaluation of the damage state of buildings and describes the results achieved in an interesting application: the experimental dynamic analysis carried out on the inaccessible damaged bell tower of the Church of Santi Giacomo and Filippo in Mirandola (Italy). The study is based on observations performed using the IBIS-S ground-based radar interferometer to remotely measure the displacements of several elements of the building above 0.01 mm amplitude. This totally noninvasive and nondestructive approach has proved to be reliably implemented as a useful method to structural health monitoring procedures and especially for extensive and fast inspection analyses aiming at the first evaluation of the damage level and the soundness of slender buildings after earthquakes.

scholarly journals Marker-free monitoring of the grandstand structures and modal identification using computer vision methods

2018 ◽  
Vol 18 (5-6) ◽  
pp. 1491-1509 ◽  
Author(s):  
Chuan-Zhi Dong ◽  
Ozan Celik ◽  
F Necati Catbas
Keyword(s):  
Structural Health Monitoring ◽  
Sensor Network ◽  
Health Monitoring ◽  
Single Point ◽  
Modal Identification ◽  
Dynamic Monitoring ◽  
Structural Dynamic ◽  
Multiple Camera ◽  
Structural Health ◽  
Displacement Sensors

In this study, a vision-based multi-point structural dynamic monitoring framework is proposed. This framework aims to solve issues in current vision-based structural health monitoring. Limitations are due to manual markers, single-point monitoring, and synchronization between a multiple-camera setup and a sensor network. The proposed method addresses the first issue using virtual markers—features extracted from an image—instead of physical manual markers. The virtual markers can be selected according to each scenario, which makes them versatile. The framework also overcomes the issue of single-point monitoring by utilizing an advanced visual tracking algorithm based on optical flow, allowing multi-point displacement measurements. Besides, a synchronization mechanism between a multiple-camera setup and a sensor network is built. The proposed method is first tested on a grandstand simulator located in the laboratory. The experiment is to verify the performance of displacement measurement of the proposed method and conduct structural identification of the grandstand through multi-point displacement records. The results from the proposed method are then compared to the data gathered by traditional displacement sensors and accelerometers. A second experiment is conducted at a stadium during a football game to validate the feasibility of field application and the operational modal identification of the stadium under human crowd jumping through the measured displacement records. From these experiments, it is concluded that the proposed method can be employed to identify modal parameters for structural health monitoring.

scholarly journals Impulsive Tests on Historical Structures: The Dome of Teatro Massimo in Palermo

2016 ◽  
Vol 10 (1) ◽  
pp. 122-135 ◽  
Author(s):  
Mario Di Paola ◽  
Francesco Lo Iacono ◽  
Giacomo Navarra ◽  
Antonina Pirrotta
Keyword(s):  
Structural Characteristics ◽  
Historical Memory ◽  
Conservation Status ◽  
Dynamic Monitoring ◽  
Structural Elements ◽  
Historical Building ◽  
Structural Dynamic ◽  
Historical Structures ◽  
Material State ◽  
Historical Past

Cultural heritage is the set of things, that having particular historical cultural and aesthetic are of public interest and constitute the wealth and civilization of a place and its people. Sharpen up methodologies aimed at safeguarding of monuments is crucial because the future may have in mind the historical past. Italy is a country that has invested heavily on its historical memory returned in large part by the historical building or the monuments. Furthermore, culture represents a fundamental indicator of the growth of the culture of a country. Consider a monitoring project of one of the most Impressive theater in the world, like “Teatro Massimo” in Palermo (Italy), means to add value to both of the issues mentioned above. Among several methods providing useful information about the conservation status of the structures, dynamic monitoring techniques are suitable to check and restore the global behavior of the buildings. The anomalous features diagnosis of the structural dynamic response is an index of alterations of the material state and, in the worst cases, is related to the presence of damaged structural elements. The present paper assesses, through a real investigation, the importance of dynamic tests on historical buildings. In particular impulsive tests return the main structural characteristics describing the current behaviour. Such tests are then crucial for updating numerical evaluation and check the need of restoring original main features or not, suggesting a strategy of restoration as well.

Behavior of the Leaning Tower of Pisa: Analysis of Experimental Data from Structural Dynamic Monitoring

2016 ◽  
Vol 847 ◽  
pp. 445-453 ◽  
Author(s):  
Raffaello Bartelletti ◽  
Gabriele Fiorentino ◽  
Giuseppe Lanzo ◽  
Davide Lavorato ◽  
Giuseppe Carlo Marano ◽  
...  
Keyword(s):  
Dynamic Testing ◽  
Relevant Information ◽  
Dynamic Monitoring ◽  
Dynamic Features ◽  
Structural Dynamic ◽  
Present Complex ◽  
Heritage Buildings ◽  
Seismic Records ◽  
Soil Foundation ◽  
Complicated Task

Understanding the structural behavior of heritage buildings is usually a very complicated task because they typically present complex deterioration and damage patterns which cannot be fully evaluated by means of visual inspections. Moreover, the reliability of such constructions largely depends on different materials, structural components and details, the health of which is often unknown or affected by great uncertainties. In this regard, the experimental dynamic testing of heritage buildings and monuments subjected to ambient vibrations has become a valuable tool for their assessment because of the minimum interference with the structure. Traffic-induced vibrations are not always a feasible dynamic load for monumental buildings due to their very low intensity or owing to existing restrictions to road and rail traffic. On the other hand, the analysis of the experimental response under earthquakes can lead to more relevant information about the dynamic behavior of historic constructions, provided that the structure is equipped with a permanent sensor network. Within this framework, the present work illustrates preliminary results carried out from time and frequency domain analyses performed on the experimental dynamic response of the leaning tower of Pisa using seismic records. The main dynamic features of the monument have been identified, and then examined taking into account the seismic input and the soil-foundation-structure interaction.

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