Adaptable Dual Control Systems
For Earthquake Resistance
Author(s)
M. C. Phocas & T. L. Sophocleous
Abstract
The use of passive energy dissipation systems for seismic control has been
proven internationally over the past years as most promising. The proposed
concept of Adaptable Dual Control Systems (ADCS), presented in the present
paper, relies on the seismic performance of braced frames with cables or tension
only rods, following a closed circuit, and hysteretic dampers. ADCS are based on
a dual function of the component members, resulting in two practically
uncoupled systems: a primary and a secondary system. The primary frame is
responsible for the normal vertical and horizontal forces, while the closed
damper-bracing mechanism, for the earthquake forces and the necessary energy
dissipation. The bracing members are fixed at the bottom of the columns and are
free to move horizontally at the primary frame’s joints. Relative displacements
are induced between the energy dissipation system’s component members and
the main frame’s members. The potentials for maximum energy dissipation of
the proposed systems are investigated in three configurations of the control
system. In all cases the damper utilizes the relative displacement between its end
joints to yield in the inelastic region, enabling the primary frame to resist
elastically. ADCS may result to significant energy dissipation, when all design
parameters involved are accordingly predefined. The predominant parameters
that characterize ADCS seismic behavior are verified in respect to the
mechanical properties of the control elements under the action of ten selected
earthquake records of the Greek-Mediterranean region. A comparative
parametric analysis of the three systems’ seismic behavior leads to significant
recommendations for their application as alternative energy dissipation systems.
Keywords: earthquake resistance, frame structures, passive control, adaptable
systems.
Keywords
earthquake resistance, frame structures, passive control, adaptable
systems
Related Book
Other papers in this volume
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