This thesis concerns vibrations from trains
running on the planned railway on the Danish
side of the Femern Belt Link. The vibrations
emanating from the passing trains
are analyzed in relation to a reference
building place 25m from a new planned
railway. The amplitudes of the waves are
evaluated on two soil profiles, as well as the
response of two different structures, with
different boundary conditions. The amplitudes
are evaluate with respect to distance
from the source to the reference building
and frequency of the train load application,
and especially the transmission of waves
originated in the soil into the reference
building is analyzed. The response of the
soil and the structure is found in an uncoupled
model, base on the Boundary Element
Method and the Finite Element Method,
as well as a coupled model combining
BEM and FEM. It is found, that the response
of the soil, is highly influenced by
the response of the building near its natural
frequencies. At the eigenfrequency of
the structure, the response of the soil is
balanced by reaction forces from the building
in the coupled model. This can give rise
to reductions of the soil response of up to
80% in the coupled model.