Dual Earthquake Resistant Frames
Author(s)
T. L. Sophocleous & M. C. Phocas
Abstract
Structural control through energy dissipation systems has been increasingly
implemented internationally in recent years and has proven to be a most
promising strategy for the earthquake safety of structures. In extending the
\“classical” approach of the capacity design for earthquake structural resistance,
the integration of passive damping devices within the structure aims at energy
dissipation within specific structural zones. The present paper examines an
alternative control system for achieving dynamic structural adaptability, which
consists of an energy dissipation device and a cable bracing mechanism with a
kinetic closed circuit, working only in tension. The closed bracing mechanism
does not practically affect the initial stiffness of the system, i.e. the concept relies
on two completely \“separate” systems: a primary for the vertical- and wind loads
and a secondary for the earthquake loads. An additional feature of the bracingdamper
mechanism compared to conventionally passively controlled systems is
the contribution of all bracing members to the energy dissipation during a
loading cycle. Three \“dual systems” with different configurations of the closed
bracing mechanisms and damping devices are investigated in their dynamic
behaviour, in the time-history range under actual earthquakes of the Greek-
Mediterranean region. The study provides significant response comparisons of
the dual systems, in respect to the stiffness of the hysteretic dampers, its effect
on the base shear force and the maximum relative displacements of the systems
and to the energy dissipation behaviour of the bracing-damper mechanism.
Keywords: dual systems, hysteretic dampers, passive control.
1 Introduction
Form, construction and energy efficiency of the structures in earthquake prone
areas depend on the integration, from an early design stage, of those structural
Keywords
dual systems, hysteretic dampers, passive control.
Related Book
Other papers in this volume
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