Analysis And Assessment Of A
Seismically Isolated Bridge
Author(s)
A. J. Kappos & E. Dimitrakopoulos
Abstract
This paper focusses on the seismic response of a bridge currently being
constructed, using the incremental launching method, as part of the Egnatia
motorway in northern Greece. The bridge is seismically isolated via elastomeric
and PTFE bearings, and has fluid dampers installed at its end abutments. The
scope of the paper is firstly the seismic analysis (using methods adopted also in
practical design), and secondly the assessment of the bridge’s earthquake
performance (using advanced inelastic time-history analysis).
Keywords: seismic isolation, bridges, damping, viscous dampers.
1 Introduction
The structure, which is analysed herein (fig. 1), is curved in plan with a radius
R=1175 m and the deck section is laterally inclined (in the transverse direction)
by 4.5%. In elevation it has a slope of 4.9% while its piers are of unequal height
that ranges from 12 to 28 m. The piers’ section is a rectangular hollow one, the
same for all pies (3.0m ×5.8m). The deck is continuous, made of prestressed
concrete and the total span reaches 482 m (36.7+9 ×45.5+35.5). The deck is a
single-cell box girder (fig. 2) with 8 different sections along its length.
All piers are connected to the deck via elastomeric or PTFE bearings, which
are considered as low damping bearings. Two fluid dampers in each direction
(longitudinal and transverse) are used at the end abutments, where the only joints
of the bridge deck are located. The dampers have practically hysteretic
behaviour, since they realize a velocity exponent a (F=C ⋅v a ) as low as 0.05. The
maximum strength they provide is 750 kN and 450 kN per damper, in the
longitudinal and transverse direction, respectively. The design of the actual
bridge was carried out by the firm T. Tsiknias & Associates (Athens).
Keywords
seismic isolation, bridges, damping, viscous dampers.
Related Book
Other papers in this volume
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