A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Use of accelerometers for bridge load testing
The use of accelerometers in place of the more conventionally used strain gages was investigated for load testing of bridges. The results showed that accelerometers are useful for this purpose and in some cases can provide more reliable results than strain gages. Their use on cracked reinforced concrete bridges is very beneficial since they easily capture the global response of the bridge. They also easily capture the overall dynamic response of the bridge due to its interaction with the moving vehicle. An accelerometer based system could also be very beneficial for long-term condition monitoring of a bridge since it more effectively captures the global response of the bridge. Changes in stiffness and modal properties of key members would immediately signal bridge degradation. An accelerometer-based system has a major drawback in that it is inherently more complicated to use than a strain gage system. The data acquisition system for accelerometers must be carefully calibrated to ensure that the vehicle-induced response is well within the ADC (analog-digital converter) range. Otherwise, ambient noise in the system can produce misleading results. Further development and simplification of the data acquisition system, similar to that done for strain gage systems in the past, could alleviate this drawback. In summary, it is apparent that accelerometers will likely never completely replace the simpler-to-use strain gage for bridge load testing. They do however offer a very nice addition to the load testing "toolbox" for specialized cases.
Use of accelerometers for bridge load testing
The use of accelerometers in place of the more conventionally used strain gages was investigated for load testing of bridges. The results showed that accelerometers are useful for this purpose and in some cases can provide more reliable results than strain gages. Their use on cracked reinforced concrete bridges is very beneficial since they easily capture the global response of the bridge. They also easily capture the overall dynamic response of the bridge due to its interaction with the moving vehicle. An accelerometer based system could also be very beneficial for long-term condition monitoring of a bridge since it more effectively captures the global response of the bridge. Changes in stiffness and modal properties of key members would immediately signal bridge degradation. An accelerometer-based system has a major drawback in that it is inherently more complicated to use than a strain gage system. The data acquisition system for accelerometers must be carefully calibrated to ensure that the vehicle-induced response is well within the ADC (analog-digital converter) range. Otherwise, ambient noise in the system can produce misleading results. Further development and simplification of the data acquisition system, similar to that done for strain gage systems in the past, could alleviate this drawback. In summary, it is apparent that accelerometers will likely never completely replace the simpler-to-use strain gage for bridge load testing. They do however offer a very nice addition to the load testing "toolbox" for specialized cases.
Use of accelerometers for bridge load testing
Anwendung von Beschleunigungsaufnehmern zur Prüfung einer Brückenbelastung
Chowdhury, M.R. (author) / Ray, J.C. (author)
2001
9 Seiten, 5 Bilder, 2 Tabellen, 7 Quellen
(Nicht paginiert).
Conference paper
English
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