37 research outputs found
The role of optimal damping allocation to control torsional seismic response in asymmetric-plan systems
A genetic algorithm for feed-forward control of semi-active devices within an early warning network system
A comparative analysis of the active control methodologies to reduce the seismic response of structures
Small scale experimental testing on base isolation and tuned mass damper combined control strategy
Reduction factors for performance based seismic design of structures with supplemental dampers
Torsional seismic response control of asymmetric-plan systems by using viscous dampers
A new approach to locating viscous dampers optimally is herein presented in order to control the
torsional seismic response of asymmetric-plan buildings. Firstly, the effects of the plan-wise distribution
of supplemental damping on torsionally dynamic behavior have been investigated by using modal
analysis techniques in the state space representation in order to highlight the main physical aspects of
the problem. Optimal design criteria have then been carried out by evaluating the H1 and H2 norms of
the transfer function relating the maximum edge displacement to the input seismic excitation. These
norms represent suitable performance indexes to investigate the optimal plan-wise distribution of
extra-structural dampers by means of parametrical analysis on varying the dynamic characteristics of
the asymmetric-plan system. The numerical constraints on the mechanical parameters related to the
practical application of the proposed control strategy are taken into account. Simple design formulae
to model the results for the H2 norm are proposed and positively verified through broad numerical
experimentation which compared the seismic response of asymmetric systems to synthetic and real
excitations for different design strategies in a plan-wise arrangement of supplemental damping