Shaking table tests of a full-scale flat-bottom manufactured steel silo filled with wheat: Main results on the fixed-base configuration
Metadatos
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John Wiley & Sons
Materia
Dynamic properties Flat-bottom silo Granular solid Shaking table Pressures
Date
2021-10-26Referencia bibliográfica
Silvestri, S... [et al.]. Shaking table tests of a full-scale flat-bottom manufactured steel silo filled with wheat: Main results on the fixed-base configuration. Earthquake Engng Struct Dyn. 2021; 00 1– 22. [https://doi.org/10.1002/eqe.3561]
Patrocinador
H2020 Research Infrastructures 730900Résumé
This paper reports on a series of shaking table tests on a full-scale flat-bottom
steel silo filled with soft wheat, characterized by aspect ratio of around 0.9. The
specimen was a 3.64-m diameter and 5.50-m high corrugated-wall cylindrical
silo. Multiple sensors were used to monitor the static and dynamic response of
the filled silo system, including accelerometers and pressure cells. Numerous
unidirectional dynamic tests were performed consisting of random signals,
sinusoidal inputs, and both artificial and real earthquake records. The objectives
of this paper are (i) to provide a general overview of the whole experimental
campaign and (ii) to present selected results obtained for the fixed-base configuration.
The measured data were processed to assess the static pressures, the
dynamic overpressures (related to the effective mass) and the accelerations of
monitored points on the silo wall, and to identify the basic dynamic properties
(fundamental frequency of vibration, damping ratio, dynamic amplification
factors) of the filled silo. Themain findings are discussed and compared with the predictions given by available theoreticalmodels and code provisions. It is found
that the fundamental frequency slightly decreases with increasing acceleration,
while it slightly increases with increasing compaction of the granular material.
For close-to-resonance input, the dynamic amplification (in terms of peak
values of accelerations) increases along the height of the silo wall up to values
of around 1.4 at the top surface of the solid content. The dynamic overpressures
appear to increase with depth (differently from the EN1998-4 expectations), and
to be proportional to the acceleration.