Detection of Damage in a Lattice Mast Excited by Wind by Dynamic Measurements

Lars Pedersen, Rune Brincker

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Abstrakt

The paper illustrates the effectiveness of monitoring the dynamic response of a system for detection of damage herein using an output-only assessment scheme. The system is a 20 m height steel lattice mass excited by wind and the mast is instrumented with accelerometers picking up dynamic responses under ambient loading conditions. The paper presents the instrumentation and considerations regarding layout of instrumentation and strategies for acquisition and processing of data. Damage in the mast is provoked using a hacksaw and the cross sectional area of one the diagonals of the mast (one located close to the foundation) is gradually reduced by sawing deeper and deeper into the diagonal. During the process of introducing damage to the mast, its dynamic responses are recorded. By postprocessing these recordings, the changes in dynamic characteristics of the mast with the size of damage are identified. By studying the recorded variations it seems reasonable to conclude that by implementing a vibration monitoring system on the mast it would be possible to reliably detect a damage corresponding to less than a 50% loss of cross sectional area of the diagonal. This would allow for issue of a warning of a potential progress towards structural collapse prior to its occurrence.
OriginalsprogEngelsk
TitelProceedings of the 2nd International Operational Modal Analysis Conference
RedaktørerRune Brincker, Nis Møller
Antal sider9
Vol/bindVol. 2
ForlagAalborg Universitet
Publikationsdato2007
Sider659-667
ISBN (Trykt)8791606144
StatusUdgivet - 2007
Udgivet eksterntJa
Begivenhed2nd International Operational Modal Analysis Conference - Copenhagen, Danmark
Varighed: 30. apr. 20072. maj 2007
Konferencens nummer: 2

Konference

Konference2nd International Operational Modal Analysis Conference
Nummer2
LandDanmark
ByCopenhagen
Periode30/04/200702/05/2007

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