Shaking table test on overall-scale model of long-span steel structure of Beijing Daxing International Airport terminal

The long-span curved surface steel structure of Beijing Daxing International Airport terminal is super long and large, and the form of the supporting C-shaped column is novel, the structural load bearing is complex. A 1/60 scale model was designed for shaking table test to study its dynamic characteristics under the actions of 8 degree frequent, seismic precautionary and rare earthquakes. The acceleration, displacement and strain under the conditions of one-way, two-way and three-way ground motions were analyzed. The test results show that the response of the overall model is the largest under three-way ground motion, and the structure is greatly affected by the vertical seismic action. The vertical response in the central area is intense, and the horizontal seismic response in other areas is even, which shows that the integrity of the model is good. The supporting structure has good lateral stiffness and its strain response is greatly affected by the horizontal seismic action. The inter-story drift angle under the condition of 8 degree frequent earthquake is 1/639, the inter-story drift angle under the condition of 8 degree rare earthquake is 1/54, which meets the requirement of seismic code. The structure does not collapse under the condition of 9 degree rare earthquake and does not show apparent failure. It is proved that the structure prototype has reasonable safety reserve. The seismic principle that "the structure hasn't damaged under frequent earthquake, repairable under precautionary earthquake, and doesn't collapse under rare earthquake" is reached, thus the structural design is reasonable. The design of C-shaped column is reasonable, and it has good supporting action and lateral stiffness. © 2021, Editorial Office of Journal of Building Structures. All right reserved.