Akademik Veri Yönetim Sistemi
6th International Conference on Computational Mathematics and Engineering Sciences / 20-22 May. 2022, Ordu – Turkey, Ordu, Türkiye, 20 Mayıs - 22 Haziran 2022, cilt.1, sa.1, ss.43-53
Ambient vibrations, which are
constantly and intensely felt in buildings, significantly affect the dynamic
properties of the building such as the natural dominant period, damping ratio,
floor displacements and accelerations that change over time. Ambient vibrations
caused by explosions, the passage of heavy vehicles and heavy human and vehicle
traffic are recorded with sensors such as accelerometers and speedometers.
Otherwise, considering the vibrations that are not related to the structure in
the estimation of the dynamic behavior of the structure may lead to incorrect
calculations. In this study, ambient vibrations taken from a structure using
accelerometers with a measurement capacity of 3g acceleration and frequency
ranges of 0.1-50 Hz were filtered in the frequency range of 0.1-10 Hz, 0.1-25
Hz and 0.1-50 Hz with bandpass filtering technique and used in structural
analysis. In order to investigation the effect
of filtered ambient vibrations in the study, a 9 m high steel state structure
with 1 opening in the X direction and 7 spans in the Y direction with heavy
traffic and noise flow was used. In order to represent the ambient vibrations
in the structure, so-called acceleration-frequency curves were drawn and modal
parameters were determined. By using the filtered ambient vibrations, the
dynamic responses of the structure are calculated and the structural damping,
structure acceleration and displacements are approximately calculated. The
results of the study show that filtering in the 0.1-25 Hz frequency range is
more appropriate in order to see the suitability of the structure in terms of
dynamic behavior and the effects of modes such as bending, torsion and lateral
torsional buckling. However, it is predicted that these frequency ranges may
change in structures with different span distances and heights. The study
showed that correct filtering and frequency ranges should be applied in order
to determine the dynamic behavior of a structure under the influence of ambient
vibrations.