20788
2009
eng
757
762
I
bookpartcollection
Science Press
Beijing, China
Natural Science Foundation of China
0
--
--
--
Environmental vibrations due to different technical sources, amplitude-distance laws in experiment and theory
Environmental vibrations - prediction, monitoring, mitigation and evaluation
23111
978-7-03-025765-9
Sonderstandort: Publica-Schrank
4th International Symposium on Environmental Vibration: Prediction, Monitoring and Evaluation (ISEV2009)
Beijing, China
2009-10-28
2009-10-30
Lutz Auersch
Samir Said
eng
uncontrolled
Amplitude-distance laws
eng
uncontrolled
Environmental vibrations
eng
uncontrolled
Field tests
eng
uncontrolled
Wave theory of attenuation
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
22124
2010
eng
337
344
3
9
article
Science Press
Beijing, China
1
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--
--
Attenuation of ground vibrations due to different technical sources
The attenuation of technically induced surface waves is studied theoretically and experimentally. In this paper, nineteen measurements of ground vibrations induced by eight different technical sources including road and rail traffic, vibratory and impulsive construction work or pile driving, explosions, hammer impulses and mass drops are described, and it is shown that the technically induced ground vibrations exhibit a power-law attenuation ν ~ r -q where the exponents q are in the range of 0.5 to 2.0 and depend on the source types. Comparisons performed demonstrate that the measured exponents are considerably higher than theoretically expected. Some potential effects on ground vibration attenuation are theoretically analyzed. The most important effect is due to the material or scattering damping. Each frequency component is attenuated exponentially as exp(-kr), but for a broad-band excitation, the sum of the exponential laws also yields a power law but with a high exponent. Additional effects are discussed, for example the dispersion of the Rayleigh wave due to soil layering, which yields an additional exponent of 0.5 in cases of impulsive loading.
Earthquake engineering and engineering vibration
24624
10.1007/s11803-010-0018-0
1671-3664
Sonderstandort: Publica-Schrank
14.10.2010
Lutz Auersch
Samir Said
eng
uncontrolled
Wave attenuation
eng
uncontrolled
Environmental vibrations
eng
uncontrolled
Field tests
eng
uncontrolled
Material damping
eng
uncontrolled
Scattering damping
eng
uncontrolled
Rayleigh wave
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
38261
2016
eng
3
19
conferenceobject
Zhejiang University, Hangzhou
0
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Vibration measurements for the control of damaged and repaired railway tracks
The damage detection and repair control have become important tasks for ballast and slab tracks. Measurements which compare the damaged and the repaired status of the same track section at different times, or which compare a damaged and an intact track section at the same time, have been successfully performed at some sites in Germany with slab tracks and ballast tracks and compared with the theoretical behaviour of intact and damaged tracks. The loss of contact between the sleeper and the plate, between the plate and the base layer, and some problems with soft or weakened soil have been analysed. The observed results, changes in the time histories of displacements and velocities due to train passages and in the transfer functions (compliances) due to hammer impacts, are encouraging that these measurements can be used to detect track damage. In addition, calculations with the combined finite-element boundary-element method have been used to confirm the conclusions about intact or damaged railway tracks.
Proceedings of the 7th International Symposium on Environmental Vibration and Transportation Geodynmaics
7th International Symposium on Environmental Vibration and Transportation Geodynmaics
Hangzhou, China
28.10.2016
30.10.2016
Lutz Auersch
Samir Said
eng
uncontrolled
Railway track
eng
uncontrolled
Slab track
eng
uncontrolled
Ballast track
eng
uncontrolled
Track-soil interaction
eng
uncontrolled
Field tests
eng
uncontrolled
Track damage monitoring
eng
uncontrolled
Finite element method
eng
uncontrolled
Boundary element method
Ingenieurbau
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Graue Literatur
31164
2014
eng
805
812
conferenceobject
1
--
--
--
The dynamic behavior of railway tracks with under sleeper pads, finite-element boundary-element model calculations, laboratory tests and field measurements
A variety of isolation measures exists to reduce the vibration in the neighbourhood of railway lines. They can be roughly classified as elastic or stiffening systems. There are the following elastic elements, rail pads or resilient fixation systems between rail and sleeper, under sleeper pads or sleeper shoes under the sleepers, and ballast mats under the ballast. Stiffening systems (plates) are used as slab tracks, floating slab tracks, or mass-spring systems. In the EU project “Railway induced vibration abatement solutions (RIVAS)”, elastic under sleeper pads have been investigated. The dynamic behaviour of the track and the surrounding soil has been calculated by the combined finite-element boundary-element method in a systematic parameter study. It has been shown that the mitigation effect can be improved by soft under sleeper pads or by heavy sleepers. Consequently, such track elements (soft under sleeper pads and heavy sleepers) have been thoroughly investigated in laboratory tests to establish the static and dynamic parameters as well as their serviceability. Finally, field tests at and near railway tracks with and without under sleeper pads have been performed. To determine the reduction effect of the isolated track, the ground vibrations excited by trains or artificial sources have been measured. The soil properties at the different sites have also been measured so that the comparison of the isolated and un-isolated track can take into account possible differences of the soil parameters. The contribution shows how the different (numerical, laboratory and field) methods and results can be combined to achieve an improved mitigation solution with soft under sleeper pads and heavy sleepers for ballasted and slab tracks.
EURODYN 2014 - 9th International conference on structural dynamics (Proceedings)
34159
978-972-752-165-4
2311-9020
EURODYN 2014 - 9th International conference on structural dynamics
Porto, Portugal
30.06.2014
02.07.2014
14.08.2014
Lutz Auersch
Samir Said
Esther Knothe
Werner Rücker
eng
uncontrolled
Railway track
eng
uncontrolled
Track-soil interaction
eng
uncontrolled
Mitigation
eng
uncontrolled
Under sleeper pads
eng
uncontrolled
Laboratory tests
eng
uncontrolled
Field tests
eng
uncontrolled
Ground vibration
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
42581
2017
eng
1
14
September
12
article
Elsevier
London
0
--
--
--
Track-soil dynamics – calculation and measurement of damaged and repaired slab tracks
The damage detection and repair control have become important tasks for ballast and slab tracks. Measurements which compare the damaged and the repaired status of the same track section at different times, or which compare a damaged and an intact track section at the same time, have been successfully performed at some sites in Germany. The loss of contact between the sleeper and the track plate, between the track plate and the base plate, and between the base plate and the base layer have been analysed. The soil properties of each site have been measured and have been used to establish realistic track-soil models. Theoretical results of the wavenumber domain and the finite-element boundary element method have been compared with the experimental results. The observed experimental and theoretical results, changes in the time histories of displacements and velocities due to train passages and in the transfer functions (receptances) due to hammer impacts, are encouraging that these measurements can be used to detect track damage.
Transportation Geotechnics
10.1016/j.trgeo.2017.06.003
2214-3912
Lutz Auersch
Samir Said
eng
uncontrolled
Railway track
eng
uncontrolled
Slab track
eng
uncontrolled
Track-soil interaction
eng
uncontrolled
Field tests
eng
uncontrolled
Track damage
eng
uncontrolled
Monitoring
eng
uncontrolled
Finite element method
eng
uncontrolled
Boundary element method
Ingenieurbau
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")