Design of multi-storey long cantilever steel structure in high seismic intensity area
Midea Center of Chang′an Yue is an important supporting project of the 14th National Games of the People′s Republic of China.It is an irregular complex structure with three layers of large cantilevers on the south side,with a maximum cantilever length of 38.5m.Steel frame-bracing system is adopted by the main structure,and steel truss structure is adoptd by the cantilever part.The analysis and research on the design difficulties of large cantilever structure were carried out.The scheme selection of the overall structure,the analysis results of the overall structure and the performance-based seismic design results of the structure were mainly introduced.The comfort analysis of cantilever steel truss under single walking excitation and crowd excitation,the construction simulation analysis considering the installation process,unloading sequence and floor stiffness formation sequence of long cantilever structure,and the influence of long cantilever on foundation design were also mainly introduced.The results show that the multi-story long cantilever structure of this project has a high safety reserve,and the overall structure has good seismic performance.In the design of long cantilever structure,special attention should be paid to the influence of construction process,and the adverse effect of vertical component tension should be considered in foundation design.
multi-storey long cantilever structuresteel frame-bracing systemperformance-based seismic designcomfortconstruction simulation
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