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针对7度区7栋超高层框架-核心筒结构,加载8度罕遇地震作用进行计算分析。结果表明,结构的整体破坏主要原因是结构竖向刚度突变部位或底部加强部位发生较大范围的墙肢剪切破坏。同时,裙房顶和塔楼顶的部分框架柱发生拉弯破坏,而其他大部分外框架柱抗剪承载力有较大的富裕。结构发生剪切破坏时的楼层最大位移角在1/119~1/66之间。有限元分析表明,墙肢在小偏拉作用下抗剪强度显著下降,在特大地震作用下受拉墙肢的剪切破坏可能先于拉弯破坏。仅按规范剪压比限值0.15控制剪力墙的抗剪强度不能保证结构安全。
Aiming at the seven super high-rise frame-core tube structures in 7 degree area, the effect of 8 degree rare earthquakes is analyzed and calculated. The results show that the main cause of the overall structural failure is the large-scale shear failure of the wall members at the sudden change of the vertical stiffness of the structure or the reinforced part of the bottom. At the same time, some deformation of the skirting columns and some of the top of the tower led to the bending failure, while most of the other outer frame columns had a lot of shear capacity. The maximum displacement angle of the floor when the structure is sheared and destroyed is between 1/119 ~ 1/66. The results of finite element analysis show that the shear strength of the wall members decreases significantly under the action of small deflection, and the shear failure of the tensioned wall members may be earlier than the tensile failure under the severe earthquake. Only according to the standard shear pressure ratio limit 0.15 The shear strength of the shear wall can not guarantee the structural safety.