Seismic Protection of a Model Structure Using Semi-Active Resetable Devices

摘要

In recent years, semi-active control systems have been considered for the control ofstructures subjected to seismic excitation. They are capable of generating large forces,offer highly reliable operation at a modest cost, and do not destabilize the structuralsystem. Semi-active control systems are essentially nonlinear in nature. Initial results indicate that newly developed semi-active resetable devices are quite promising for earthquake engineering applications. Semi-active resetable devices are fundamentally hydraulic or pneumatic spring elements. They possess the ability torelease the stored spring energy at any time.This paper describes analytical and experimental research into the effectiveness and feasibility of the semi-active control systems for structural protection during severe earthquake loading. The research involves experimental and analytical studies of a four-storey model structure subjected to seismic excitation and controlled by semiactive resetable energy dissipation devices. Analytical studies are carried out to determine the optimal placement and size of the semi-active devices in the miniature building structure. The effects on the structural response induced by damping and stiffness increases resulting from the addition of the devices are examined.Shaking table tests are performed on the model structure both with and without thesemi-active resetable devices. The devices are installed in the lateral bracing of themodel structure. The mechanical properties of the devices are modified according to acontrol algorithm that takes into account the measured response of the model structure.The results of the shaking table tests are presented, interpreted, and compared withanalytical predictions.