Damping And Its Importance To Structure
Author(s)
M. Rak, D. Mestrovic & A. Nizic
Abstract
The bridge of Zeceva Draga is currently being built in Croatia. Its total length is
940.8 m. It is in a horizontal curve. Its spans are 2x40+16x50+1x40. The
columns are very tall; the tallest of them is 53 m high. Because the columns are
extremely high, and the structure itself has a longer period, the application of
elastomeric bearings on the bridge is not significant. Therefore, the bridge was
calculated with the action of hydraulic dampers at the ends of the span structure
towards the abutments. Time history analysis was calculated for accelerograms
of magnitudes 5.5, 6, 6.5 and 7 (Richter scale) with distances of 0 and 15 km
from the epicentre, based on earthquakes occurring in Petrovac, in April 1979,
with a magnitude of 6.8 and Ulcinj, in April 1979, with a magnitude of 5.3, in
the region of the Adriatic coast. The damper was modelled using the Calvin’s
model. Since it is not a classical damping, the damping of the structure was
calculated separately, and then the influence of the damper was added. Damping
of devices is modelled depending on velocity. The damping of devices itself
significantly reduces the force. The rigidity of the damper is apparent and it was
used to simulate the elastic behaviour of the device because of the hydraulic
compressibility. In the laboratory of the Civil Engineering Faculty in Zagreb, the
model with two spans was tested with and without dampers, in the longitudinal
and transversal directions, and it was proved that dampers increase the damping
of the system. The application of dampers is diverse, from silos, masts, towers,
stands to bridges and factory chimneys.
Keywords: damping, damper, earthquake, dynamic analysis, bridge.
1 Introduction
The structures take on great quantity of energy generated by earthquakes. That
energy can produce considerable deformations, even fracture of a structure. A
structure must have capacity to dissipate that energy, either by permanent
Keywords
damping, damper, earthquake, dynamic analysis, bridge.
Related Book
Other papers in this volume
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