Control of Hysteretic Structures Using Hoo Algorithm and Stochastic Linearization Techniques.
Control of Hysteretic Structures Using Hoo Algorithm and
Stochastic Linearization Techniques.
Sadek, F.; Ftima, M. B.; El-Borgi, S.; McCormick, J.;
Riley, M. A.
U.S. National Conference on Earthquake Engineering, 7th
Proceedings. (7NCEE). Theme: Urban Earthquake Risk.
Earthquake Engineering Research Institute (EERI). July
21-25, 2002, Boston, MA, 1-10 pp, 2002.
algorithms; control algorithms; hysteretic structures;
H(infinity); static output feedback; stochastic
linearization; structural control
This paper presents a robust static output feedback
H(infinity) algorithm for control of hysteretic civil
engineering structures subjected to earthquake ground
motions. Hysteretic structures present a problem for
control design and algorithm development due to changes
in the structural parameters during large seismic
events. The conventional approach that has been employed
in the past is to linearize the structure at the initial
equilibrium state, thus ignoring the hysteretic
characteristics of the structure when computing the gain
matrices. This paper extends the H(infinity) algorithm,
which has been developed previously for linear
structures, into nonlinear structures using a newly
developed procedure that uses stochastic equivalent
linearization. In this procedure, the hysteretic
parameters are linearized assuming the ground motion to
be a filtered white noise using the Kanai-Tajimi power
spectral density. The effectiveness of this procedure
over the conventional approach is demonstrated by
simulation results of a hysteretic
single-degree-of-freedom structure subjected to
earthquake ground motion. This study also shows the
effectiveness of using static output feedback for
controlling hysteretic structures. For this case, the
control effectiveness is not lost when the measurement
of the hysteretic variable is ignored.