Research and application of seismic isolation technology on Xi'an Silk Road International Conference Centre

With the increasing complexity of buildings and more application of isolation technology, it is necessary to study and discuss the key issues in isolation design process of large-span complex structures. This paper takes Xi'an Silk Road International Conference Centre as an example and illustrates the seismic isolation design for large-span complex structures. The aboveground part of the building is designed as a mega steel frame structure and the underground part is designed as a concrete frame-shear wall structure. The isolation layer locates at the top of columns under the basement roof. A combination of rubber isolation bearings, elastic sliding bearings and viscous dampers is used in this isolation layer. Through the layout schemes selection and computational analysis, it is proved that the isolation layer locating at the top of columns under the basement roof is more applicable, and the isolation design meets the requirements of the code. In light of the features of the structure, the following issues are investigated and discussed, including torsion control of isolation structures, temperature effects in extra-long span steel structures with seismic isolation, post-earthquake repositioning ability of isolation layer, error control in double bearing layout and levelness control of elastic sliding bearings. Corresponding solutions and control measures to all issues are proposed, which can provide reference for similar programs. © 2020, Editorial Office of Journal of Building Structures. All right reserved.