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| Titel |
Detecting stress changes in an engineering structure with elastic waves |
| VerfasserIn |
Christoph Sens-Schönfelder, Simon Stähler |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044044
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| Zusammenfassung |
| Monitoring of the complex wave field in heterogeneous media lead to outstanding
seismological measurements of weak structural changes in volcanoes and fault zones. Also in
laboratory experiments the sensitivity of scattered waves to weak changes in the propagation
medium has been demonstrated. Here we present an investigation on an intermediate scale to
monitoring stress induced velocity variations in a concrete construction. The construction is a
highway bridge in Germany made of reinforced concrete. It was build with the timed-shifting
method. This means that construction takes place at one side of the bridge which is
successively pushed over the pillars as the constructions continues. During the movement of
the construction over the pillars the stress in the deck slab undergoes changes from tension to
compression.
We used seismic equipment to induce elastic waves in the deck slab of the bridge at
different position of the array relative to the supporting pillars. Comparing reverberating
waves in the slab recorded at different stress states we can infer changes in the propagation
velocity. The observed velocity changes agree with the predicted variations based on modeled
stress concentrations in the slab.
Since structural integrety is important for every engineering structure the use of scattered
elastic waves offers a great potential for effective monitoring. |
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