某超限高层的转换层构件验算分析

摘要

In order to identify whether the design performance of the transfer story components of a certain super high-rise building can meet the structure aseismatic design requirements,according to existing problems in the design,necessary improvement measures are proposed in this paper.Performance indexes of the transfer story components are calculated,and the calculation results are compared with quantitative control standards in the design code(GB50011-2010)and technical specification(JGJ3-2010).When small earthquakes act,the maximum axial load ratio of shear wall in the transfer story is 0.49,the maximum axial load ratio of transfer column is 0.44,the maximum axial load ratio of frame column is 0.51,and the minimum reinforcement ratio of shear wall is no less than 0.25 while the maximum reinforcement ratio reaches 1.31.When moderate earthquakes act,the maximum normal stress of part of the wall is + 1.28,and the values of performance indexes of components are within the specified range.When major earthquakes act,the maximum shear compression ratio of shear wall is 0.145,the maximum shear compression ratio of transfer column is 0.046,and the minimum ratio of the bearing capacity of transfer beams to each kind of earthquake effect is 1.36.Under the action of small earthquakes,moderate earthquakes,and major earthquakes respectively,the design performances of transfer components can meet the structure aseismaticrequirements in the design code (GB50011-2010)and technical specification (JGJ3-2010),but the reinforcement of shear wall in the transfer story is a little too large.Under the action of moderate earthquakes,part of the wall has normal stress,and is under small eccentric tension.%目的 判断某超限高层的转换层构件的设计性能是否满足结构抗震要求,提出在临近结构加强部位的部分墙体及顶部外形突变位置出现了较大变形时的改进措施.方法 计算转换层构件的各项性能指标,并将计算结果与国家标准《建筑抗震设计规范》(GB50011-2010)和行业标准《高层建筑混凝土结构技术规程》(JGJ3-2010)规定的量化控制标准进行对比.结果 小震时,转换层剪力墙最大轴压比为0.49,转换柱最大轴压比为0.44,框架柱最大轴压比为0.51,剪力墙肢最小配筋率不小于0.25,但最大配筋率达1.31;中震时,部分墙肢最大正应力为+1.28,构件各项性能指标的计算结果未超出规范及规程规定的限值范围;大震时,剪力墙肢最大剪压比为0.145,转换柱最大剪压比为0.046,转换梁承载能力与各种地震作用效应的最小比为1.36.结论 在小震、中震和大震分别作用下,转换层构件的设计性能均满足《建筑抗震设计规范》(GB50011-2010)和《高层建筑混凝土结构技术规程》(JGJ3-2010)规定的结构抗震要求,但转换层剪力墙肢配筋偏大.在中震作用下,个别墙肢出现正应力,且为小偏心受拉.