Energy dissipation design and comfort analysis of large-scale spiral ramp in Sanxingdui Museum of ancient Shu cultural relics
The spiral ramp in the atrium of the Sanxingdui Ancient Shu Cultural Relics Museum adopts a steel box girder structure system,with a maximum radius of 28.7m,a horizontal projection length of 118.5m and a width of 4.5～14.5m.The seismic isolation(vibration reduction)design process of the spiral ramp was introduced.The viscous dampers and tuned mass dampers were installed to minimize the structural response of the ramp under earthquake and pedestrian excitation.A multi-scale integral model was established using MIDAS Gen and ANSYS softwares to consider the interaction between the spiral ramp and main structure,and seismic time history analysis and pedestrian excitation comfort analysis were conducted.The results show that the damping efficiency of viscous dampers on spiral ramp under different levels of earthquakes is about 45%～50%for horizontal acceleration,and the damping efficiency for horizontal displacement is about 55%～70%,respectively.The damping efficiency of setting a tuned mass damper to reduce the vertical vibration acceleration of a spiral ramp is about 55%～60%,which effectively reduces the structural response of the ramp under pedestrian excitation.
Sanxingdui Museum of ancient Shu cultural relicslarge-scale spiral rampenergy dissipationpedestrian excitationcomfort analysisviscous dampertuned mass damperdamping efficiency
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