Effects of Damper Distribution in Controlling Multiple Torsional Response Parameters of Asymmetric Structures

Abstract eng:
Supplemental viscous dampers with suitable distribution are very effective to mitigate the earthquake induced damage in buildings with asymmetric plan. The main advantage of these types of dampers is that their forces are out of phase with the other forces applied to the structure so they can decrease the responses efficiently. Using supplemental viscous dampers decreases lateral displacement (drift) of the structures in earthquake but it may increase lateral acceleration of stories and injure secondary systems. The aim of this investigation is to find suitable distribution of these devices to decrease lateral displacement (drift) efficiently and also control lateral acceleration. To achieve this aim, several single-story structures with one-way stiffness, strength and damping eccentricities are considered. For each structure parameters of eccentricities changes and nonlinear time history analyses are performed on each case. The results show that for lower stiffness eccentricities, some suitable distribution of dampers could be found that make both lateral displacement and acceleration near to the symmetric case.

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