A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Testing civil structures using multiple shaker excitation techniques
Civil structures like buildings have been subjected to simulated earthquakes for many years. A growing number of structures have also been subjected to controlled random, swept-sine and transient inputs with the use of one or more exciters in either single axis or multiple axis configurations. These types of tests are commonly called forced-vibration tests (FVTs). Recent research1'7 is exploring the use of FVT and experimental modal analysis to detect damage to existing civil structures. Concurrent with these developments, multi-input-multi-output (MIMO) vibration control systems have also been developed to control the relative phase and coherence between components of a response vector of a structure undergoing a FVT. This response vector could consist of the outputs of an array of transducers like accelerometers, load cells and/or LVDTs (linear variable differential transformers) located at various locations throughout a structure. Note that in some cases, the objective of a FVT is to maintain an exact earthquake waveform at selected actuator input locations. Any modification of these patterns caused by feedback from the test buildings or structures must be removed. Multishaker testing of large civil structures is still early in its evolution. It's largely used to test structural models. Recent research is starting to change this as a result of the availability of NEES facilities. Theoretical advances in the use of analytical and experimental modal analysis shows much promise in localizing and characterizing damage. However, these methods require more accuracy in the modal analysis that is performed, which may not be possible with AVT and single-shaker FVT methods. The use of MIMO multishaker techniques can help expand the use of FVT methods to large structures, which can help provide the higher accuracy modal analyses that are needed to use these modal-analysis-based damage prediction and location methods.
Testing civil structures using multiple shaker excitation techniques
Civil structures like buildings have been subjected to simulated earthquakes for many years. A growing number of structures have also been subjected to controlled random, swept-sine and transient inputs with the use of one or more exciters in either single axis or multiple axis configurations. These types of tests are commonly called forced-vibration tests (FVTs). Recent research1'7 is exploring the use of FVT and experimental modal analysis to detect damage to existing civil structures. Concurrent with these developments, multi-input-multi-output (MIMO) vibration control systems have also been developed to control the relative phase and coherence between components of a response vector of a structure undergoing a FVT. This response vector could consist of the outputs of an array of transducers like accelerometers, load cells and/or LVDTs (linear variable differential transformers) located at various locations throughout a structure. Note that in some cases, the objective of a FVT is to maintain an exact earthquake waveform at selected actuator input locations. Any modification of these patterns caused by feedback from the test buildings or structures must be removed. Multishaker testing of large civil structures is still early in its evolution. It's largely used to test structural models. Recent research is starting to change this as a result of the availability of NEES facilities. Theoretical advances in the use of analytical and experimental modal analysis shows much promise in localizing and characterizing damage. However, these methods require more accuracy in the modal analysis that is performed, which may not be possible with AVT and single-shaker FVT methods. The use of MIMO multishaker techniques can help expand the use of FVT methods to large structures, which can help provide the higher accuracy modal analyses that are needed to use these modal-analysis-based damage prediction and location methods.
Testing civil structures using multiple shaker excitation techniques
Bauwerkstest mit Mehrfachschütteleinrichtungen
Underwood, Marcos A. (author) / Keller, Tony (author)
Sound and Vibration ; 42 ; 10-15
2008
6 Seiten, 13 Bilder, 1 Tabelle, 13 Quellen
Article (Journal)
English
Modal Testing of Bridge Structures using a Linear Hydraulic Shaker
| British Library Conference Proceedings | 1993
Impact Series Shaker Excitation Approach for Structural Modal Testing in Thermal Environments
| British Library Online Contents | 2018
Shaker Painted Furniture Provocative Insights into Shaker Paints and Painting Techniques
| British Library Conference Proceedings | 1998
| British Library Conference Proceedings | 2019
| British Library Online Contents | 2000