Shaking table test of Terminal A structure of Kunming International Airport

Based on the shaking table test of a 1/60 scale structural model of the Terminal A structure of the Kunming International Airport, the design method for complex isolated structure with large span is investigated. The dynamic characteristics and damping ratio, the acceleration, displacement and torsion responses under different seismic intensities, and the vertical vibration of the large cross-grid, etc., of the isolated and non-isolated structure models were examined. The failure mechanism and failure modes of the structure were studied. The results show that the base isolated structure could prolong the structural vibration periods efficiently and increase the damping ratio. The energy dissipation of the structure can be improved as well. Moreover, the result also shows that the peak acceleration of horizontal seismic input could be reduced to be 40% of the original values, which can effectively reduce the vertical vibration of the large cross-grid. But the vertical acceleration is not reduced at all. Furthermore, the acceleration, displacement and torsion responses of the structure under 8.2 degree of seismic intensity are less than those under 7.5 degree of seismic intensity. The maximum inter-story drift ratio of the isolated structure under 8.2 degree frequently occurred earthquake and rarely occurred earthquake are 1/636 and 1/201, indicating the design of the prototype structure is basically reasonable. The isolation can improve the seismic performance effectively. The horizontal earthquake action of the structure above isolation layer in 8.2 degree of seismic intensity are les than the corresponding value of the non-isolated structure in 7.5 degree of seismic intensity. Finally, some suggestions are put forward according to the test and analysis results.