Design Of An Active Controller For Quincy Bayview Bridge, Illinois, U.s.a. Against Seismic Excitation-part Ii: Control Implementation

摘要

In this work two active controllers have been designed against seismic excitation of a real-life cable-stayed bridge, Quincy Bayview Bridge in IL, U.S.A. An updated finite element model of the bridge is constructed in Matlab~R . A linear evaluation model based on a dead-load-deformed structure is arrived at by nonlinear static analysis. The model is reduced by static condensation. The reduced model has been validated by comparing transfer functions corresponding to both linear and reduced linear evaluation models. The reduced model is transferred to state space for control implementation and is further reduced with balance realization for effective control design implementation. This reduction has also been validated using transfer functions. Two active controllers, one against uniform support excitation and the other against multiple support excitations, have been designed to control the response of the bridge against three representative earthquakes. Multiple support excitation case is considered for different angles of attack of earthquake excitation and time lags of incidence of earthquake wave in different supports. Performance indices of the controller show how it reduces the key peak pylon responses. It has been observed that the active controllers perform well against these adopted performance indices.