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Using FeiXi HuaMuCheng exhibition centre as a case study, this paper compares the implications of using two different types of models for structural analyses. One model only includes the upper part of the structure, while the other includes the supporting structures as well. Utilizing both the mode decomposition response spectrum method and a dynamic time history analysis to perform structural analysis, the structure's natural vibration frequency, displacement and support reaction are obtained. The results show that using the model which only includes the structure's upper part will reduce the safety of the structure's seismic design. As such, it is recommended that both the upper structure and its supporting structures are considered together when designing the steel roof's structure.

The main bridge in North Branch of Xiamen-Zhangzhou Cross-Sea Bridge is a 5-span continuous steel box girder double-pylon cable-stayed bridge with 780m main span and the basic earthquake intensity at the bridge site is VII. In order to ensure the safety of the bridge under earthquake, the special seismic design of the bridge must be carried out. In this paper, the critical issues in seismic design of the bridge are studied. Firstly, the seismic fortification objectives and criteria are determined, then the influence of seismic excitation method, pylon(pier)-girder connection type, pile-soil interaction, liquefaction and scouring on the bridge is analyzed, and finally the optimization design of the damper is conducted through the sensitivity analysis of parameters. This paper provides the general idea of the seismic design of long-span cable-stayed bridges, which can be adopted by the seismic design of similar bridges.