摘要
Abstract
For a 250 m super high-rise building located in a high seismic intensity area,three structural systems—namely mega-frame core-tube,frame-braced core-tube,and diagrid-braced core-tube—are adopted with reasonable layout designs.Appropriate seismic performance targets are set,and general structural analysis software YJK and MIDAS Gen are used for computational analysis,respectively.This achieves seismic performance-based design of the structure,supplemented by horizontal acceleration checks of the floors.The analysis shows that the frame-braced core-tube structure has the lightest mass,while the mega-frame core-tube structure is the heaviest.It is found that the diagrid-braced core-tube structure possesses the greatest spatial stiffness,the smallest lateral deformation,and the largest horizontal acceleration.For the mega-frame core-tube structure,stiffness and deformation in the vertical direction change abruptly at the mega-frame level,which restrains the overall lateral deformation.Regardless of the structural system adopted,the vertical positions of peak horizontal acceleration and maximum inter-story drift do not coincide,though their distribution patterns remain similar.Elastoplastic analysis is conducted using SAUSG,with checks on deformation,acceleration,internal forces,and energy dissipation parameters to evaluate the performance level of structural members.Areas with noticeable damage are identified to verify the reliability of the equivalent elastic design.The results indicate that slab damage is the least in the frame-braced core-tube structure,while core-tube damage is minimal in the diagrid-braced core-tube system.The equivalent damping ratio of core-tube strain energy is lowest in the diagrid-braced core-tube structure and highest in the mega-frame core-tube structure.关键词
超高层结构体系/巨型框架/巨型支撑/斜交网格支撑/楼面水平加速度/应变能等效阻尼比Key words
super high-rise structural system/mega-frame/mega-bracing/diagrid bracing/horizontal floor acceleration/equivalent damping ratio of strain energy分类
建筑与水利
