27983
2013
eng
50
59
51
article
Elsevier Appl. Sci. Publ.
Barking
1
--
--
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Response to harmonic wave excitation of finite or infinite elastic plates on a homogeneous or layered half-space
The soilstructure interaction of elastic plates on homogeneous or layered soils excited by horizontally propagating waves is analysed. Large plates are modelled by a combined finite-element boundary-element method (FEBEM), whereas the response of infinitely long plates is calculated by a numerical integration in the frequencywavenumber domain. The finite-element boundary-element method yields the complete soilplate transfer function of frequency and distance whereas the frequencywavenumber solution of the infinitely long plate can serve as an approximation for long distances on a finitely long plate. The soilplate transfer function starts to decrease strongly at the coincidence frequency, where the bending stiffness equals the plate inertia. A strong decrease follows at mid frequencies and a strong reduction of less than 0.1 of the ground vibration is reached at high frequencies. Rules for the characteristic frequencies are derived from the numerical results clearly indicating the strongest influence of the soil stiffness and the weaker influence of the bending stiffness of the plate. The influence of the mass, length and width of the plate are shown to be limited in case of realistic parameters, but it should be noted that the reduction effects are less effective for layered soils and for nearer observation points.
Computers and geotechnics
30826
10.1016/j.compgeo.2013.02.001
0266-352x
Sonderstandort: Publica-Schrank
10.04.2013
Lutz Auersch
eng
uncontrolled
Plate-soil interaction
eng
uncontrolled
Wave excitation
eng
uncontrolled
Flexible plate
eng
uncontrolled
Layered soil
eng
uncontrolled
Vibration reduction
eng
uncontrolled
Finite-element boundary-element method
eng
uncontrolled
Frequency-wavenumber method
7 Bauwerkssicherheit
7.2 Ingenieurbau
Verlagsliteratur
Papiergebundenes Belegexemplar in der Bibliothek der BAM vorhanden ("Hard-copy Access")
39080
2017
eng
555
574
3
87
article
Springer
Berlin, Heidelberg
1
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Static and dynamic behaviours of isolated and unisolated ballast tracks using a fast wavenumber domain method
The dynamics of un-isolated and isolated ballast tracks have been analysed by multi-beam models for the track and by a layered half-space model for the soil. The solution is calculated in frequency-wavenumber domain and transformed back to space domain by a wavenumber integral. This is a faster method compared to other detailed track-soil interaction methods and almost as fast as the widely used Winkler-soil method, especially if the compliances of the soil have been stored for repeated use. Frequency-dependent compliances and force transfer functions have been calculated for a variety of track and soil parameters. The ballast has a clear influence on the high-frequency behaviour whereas the soil is dominating the low-frequency behaviour of the track. A layering of the soil may cause a moderate track-soil resonance whereas more pronounced vehicle-track resonances occur with elastic track elements like rail pads, sleeper pads and ballast mats. Above these resonant frequencies, a reduction of the excitation forces follows as a consequence. The track deformation along the track has been analysed for the most interesting track systems. The track deformation is strongly influenced by the resonances due to layering or elastic elements. The attenuation of amplitudes and the velocity of the track-soil waves change considerably around the resonant frequencies. The track deformation due to complete trains have been calculated for different continuous and Winkler soils and compared with the measurement of a train passage showing a good agreement for the continuous soil and clear deviations for the Winkler soil model.
Archive of Applied Mechanics
10.1007/s00419-016-1209-6
0939-1533
1432-0681
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=WOS:000394111600011
16.03.2017
Lutz Auersch
eng
uncontrolled
Railway track
eng
uncontrolled
Multi-beam model
eng
uncontrolled
Layered soil
eng
uncontrolled
Wavenumber method
eng
uncontrolled
Track deformation
eng
uncontrolled
Force transfer
eng
uncontrolled
Track-soil and vehicle-track resonances
Ingenieurbau
7 Bauwerkssicherheit
7.2 Ingenieurbau
Infrastruktur
Verlagsliteratur
Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")