New strategy for controlling random seismic response of high-rise structure

Key words:  high-rise structure  vibration control  tuned mass damper  lead rubber bearing  complex mode analysis  random seismic response

Abstract:

Taking a high-rise shearing steel frame structure as engineering background, a new T-L control strategy combining the action of TMD and LRB was proposed. The nonlinear motion equations of three control structures, which included non-control, TMD control and T-L control, were equivalently linearized by nonlinear random vibration theory, respectively. The algorithm was given for obtaining the analytical solutions expressed in the first order vibration model of random seismic response for three control structures using complex mode theory, respectively. The results indicate that the T-L control strategy can more significantly reduce the displacement, velocity and acceleration response variance of high-rise structure than TMD control. The new algorithm can also be used to solve the random seismic responses of the high-rise structure with LRB storey-isolation. The peak displacement, velocity and acceleration response variance of the example are decreased by 29.3%, 27.8% and 31.6% in T-L control compared with TMD control, respectively.