Shaking table test of super high-rise structure on liquefied ground

Shaking table test was designed and carried out to study the dynamic characteristics and dynamic response of super high-rise structure on liquefied ground under earthquake. The natural frequency, damping ratio, vibration mode, seismic acceleration response ,displacement response, composition of seismic acceleration response at the top of structure，and pore water pressure of foundation were calculated and analyzed. Test results show that the natural frequency of structure decreases and the damping ratio increases with the increase of acceleration peak, and the change of curve shape of structural vibration mode is not obvious which indicates that the change of structural stiffness is not evident. The dynamic response of structure is not only related to acceleration peak but also to the spectrum characteristics of seismic wave. The seismic acceleration response at the top of super high-rise structure is mainly composed of elasto-plastic deformation acceleration component, the second is swing acceleration component and translational acceleration component. When the first seismic acceleration peak arrives, the excess pore water pressure of sand is negative.