Optimal design of liquid dampers for torsionally coupled vibration of structures

In this paper, tuned liquid column dampers (TLCD) and circular tuned liquid column dampers (CTLCD) are used to control the torsionally coupled vibration of structures subjected to multidimensional earthquake excitations. The optimal parameters of the liquid dampers are designed for the structures excited by bi-directional seismic based on the genetic algorithms (GAs). Two kinds of target functions are used in this paper. The first one concerns the maximum structural floor response and the second deals with the responses of all structural degrees. A 12-story eccentric structure model is selected as an example. The results show that the optimal parameters with the second target function can effectively control the translational responses in x and y directions as well as the torsional response.