Abstract
This paper discussed the application of health monitoring systems to 20th-century historic buildings. Natural disasters are major threats to monuments. They are often seismically vulnerable and require interventions. However, taking into account their historic and cultural values, it is appropriate to observe long-term behaviour before making a decision on intervention schemes. To this aim, health monitoring is considered an effective approach. In recent years, MEMS (micro-electromechanical systems) accelerometers have been attracting attention for their convenience and efficacy. Nonetheless, the reliability of MEMS accelerometers still needs to be examined for the monitoring of monuments as sufficient research contributions have not been made. This paper presented two case studies that were monitored by means of MEMS accelerometers. They were masonry structures positioned in seismic-prone regions in Japan. A number of earthquakes were detected by the accelerometers during one year of monitoring. To examine the accuracy of the adopted MEMS accelerometers, dynamic identification tests were conducted using high-sensitivity strain-gauge accelerometers and servo velocity meters. Based on responses obtained from the tests, numerical simulation was performed. Nonlinear static analysis was performed. The numerical simulation permitted the comparison of reliability among sensors and test types. This paper provided suggestions for the dynamic identification tests of heritage structures.
Highlights
Natural disasters, including earthquakes, floods, hurricanes and volcanic eruptions, may affect historical buildings seriously [1,2]
Such tests usually last a certain period of timem and the obtained waveforms may need to be examined carefully to identify the dynamic behaviour of the studied structures [18]
It is probably relevant to noises picked up by the MEMS accelerometers, as such a peak was not observed by the vibration testing
Summary
Natural disasters, including earthquakes, floods, hurricanes and volcanic eruptions, may affect historical buildings seriously [1,2]. Tests under operational conditions are often performed for the study of historical structures [13,17] Such tests usually last a certain period of timem and the obtained waveforms may need to be examined carefully to identify the dynamic behaviour of the studied structures [18]. Health monitoring is performed to observe the long-term behaviour of infrastructure constructions and historical structures [26,27]. To this aim, MEMS (micro-electromechanical systems) sensors increasingly attract attention [28,29]. Two historic masonry buildings in Japan were chosen as the case studies in this paper Their behaviour was observed by vibration testing and health monitoring. The seismic vulnerabilities of the studied structures were discussed based on dynamic identification tests and numerical analysis. This paper contributed to the dynamic testing of historical structures
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