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运用大型有限元软件ANSYS建立了某超高层钢框架-混凝土核心筒混合结构的精细有限元模型。对该结构进行静力分析和模态分析,以验证有限元模型的有效性,并得到该结构的自振特性。在模态分析和反应谱分析的基础上,选用Elcentro波、Taft波对该结构进行7度(0.1g)的多遇地震和罕遇地震作用下的时程分析。结果表明:该结构的结构平面布置较合理,层间位移角满足设计要求;在46~49层处,层间位移角较大,为结构的薄弱部位,在抗震设计时应予以重视;钢框架钢梁与钢筋混凝土核心筒外墙连接节点处,钢梁局部应力较大,建议通过构造措施予以加强;结构在第3层处的核心筒墙体和外框架钢柱应力均较大,在实际的结构设计中应予以重视;在重力荷载代表值分别与多遇地震、罕遇地震作用下,钢框架的钢材均未进入屈服阶段,该结构抗震性能良好。
A large finite element software ANSYS was used to establish a fine finite element model of a super high-rise steel frame-concrete core tube hybrid structure. The static analysis and modal analysis of the structure are carried out to verify the validity of the finite element model and obtain the natural vibration characteristics of the structure. On the basis of modal analysis and response spectrum analysis, Elcentro wave and Taft wave were selected to analyze the time history of this structure under the action of frequent earthquake of 7 degrees (0.1 g) and rare earthquakes. The results show that the structural plane layout of the structure is reasonable and the displacement angle between layers meets the design requirements. At the 46th to 49th floors, the displacement angle between layers is large and weak part of the structure, so attention should be paid in seismic design. Steel girder and reinforced concrete core tube wall connection node, the local stress of steel girder larger, it is proposed to be strengthened by the structural measures; structure in the third layer of the core wall and outer frame steel column stress are larger, in the actual The structural design of the steel should pay attention to it. Under the action of the representative value of gravity load and the frequent earthquakes and rarely encountered earthquakes, the steel of the steel frame did not enter the yielding stage. The seismic performance of this structure is good.