高烈度地区新型超高层建筑结构体系分析对比
Analysis and Comparison of New Structural Systems for A Super High-rise Building in High Seismic Intensity Area
对于高烈度地区250 m超高层建筑,分别采用巨型框架-核心筒、框架支撑-核心筒和斜交网格支撑-核心筒结构体系,进行合理的结构布置,通过设置适宜的抗震性能目标,采用结构通用分析软件YJK和MIDAS Gen分别进行计算分析,实现了结构的抗震性能化设计,并补充了楼面水平加速度验算。通过分析可知,框架斜撑-核心筒的质量最轻,巨型框架-核心筒最重。斜交网格支撑-核心筒的空间刚度最大,侧向变形最小,水平加速度也最大。巨型框架-核心筒沿竖向在巨型框架层刚度和变形有突变,约束整体侧向变形。不论采用何种结构体系,水平峰值加速度和最大层间位移竖向位置均不重合,但其分布规律基本一致。采用SAUSG进行弹塑性分析,分别对变形、加速度以及内力和耗能等参数进行复核,判断结构构件的性能水平,发现损伤明显的结构部位。通过分析发现,框架支撑-核心筒的楼盖损伤程度最轻,斜交网格支撑-核心筒的核心筒损伤程度最轻。斜交网格支撑-核心筒中的核心筒应变能等效阻尼比最低,巨型框架-核心筒中的核心筒应变能效阻尼比最高。
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.
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