Reduction Of Inertial Seismic Forces
In Bridges By Using The Abutment Backwall
As A \“yielding” Stopper
Author(s)
S. Mitoulis & J. Tegos
Abstract
The reduction of inertial seismic forces in long bridges, whose decks are mainly
supported on piers through bearings, is a major challenge, given the fact that
codes require seismic design of these systems using a behaviour factor q equal to
1. The objective of this paper is the investigation of the feasibility of reducing
inertial forces through the development of appropriately configured and
reinforced abutment backwalls, which play the role of \“yielding” stoppers for
seismic action in the longitudinal direction. The reduction of inertial forces
contributes to a more economical design of piers, foundations, bearings and
terminal joints of the bridge, without reducing the safety requirements.
Keywords: bridge, pounding, backwall, earthquake resistant arm, kinetic
energy, dissipation, viscous damper.
1 Introduction
The present paper applies to all the types of long bridges, either the conventional
ones or not, whose deck is either, partially or totally, monolithically connected
with the piers, or is \“floating” on bearings, as also, in that case, to precast
bridges.
As it is already known, the design of long bridges has to satisfy both
functional and earthquake resistant requirements, which are conflictful
components of the same problem with reverse design demands.
\“Floating” systems deal with the problem of functional movements with the
use of steel-reinforced elastomeric bearings, which allow the free movement of
Keywords
bridge, pounding, backwall, earthquake resistant arm, kinetic
energy, dissipation, viscous damper.
Related Book
Other papers in this volume
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