南京德基广场三期超高层建筑结构设计
摘要：由于建筑平面、立面上的需求，塔楼在底部存在较大收进且结构角部在中、高区逐层内收，为避免过多的转换结构构件，最终采用斜柱的方式满足建筑要求；为解决结构侧向刚度不足的问题，设置了伸臂桁架加强层，是一个颇具有代表性的有较多斜柱的带加强层超高层建筑结构。以层间位移角为约束条件，基于增量敏感性优化方法对伸臂桁架的位置及设置道数进行研究分析，基于力学原理分析了斜柱结构的受力机理，并对受其影响的钢梁、楼板进行专项分析，通过ABAQUS有限元软件对分叉柱关键节点进行有限元分析。结果表明：在斜柱楼层范围内，斜柱轴力产生的水平力在核心筒墙体内会造成水平剪力，其拉、压受力特性与斜柱倾斜方向相关，应重点对内倾柱进行加强。斜柱转折处的楼板受到较大拉力时会发生开裂，因此钢梁应考虑能独立承担斜柱的水平分力，按拉、压弯构件进行强度验算。斜柱转折楼层、伸臂加强层及其相邻楼层，均为楼板应力较大位置，设计中需重点关注及加强。通过专项分析加强后主体结构能达到预定的性能目标，且结构关键构件在罕遇地震下不屈服，具有良好的延性。
关键词：超高层建筑；斜柱；伸臂桁架加强层；抗震性能化设计；敏感性分析；
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Structural design of Ⅲ super high-rise building of Nanjing Deji Plaza
Abstract: Due to the requirements of the building plane and elevation, the tower has a large intake at the bottom and the corner of the structure was drawn in storey by storey in the middle and high areas. In order to avoid excessive of the structural transfer members, inclined columns are finally adopted to meet the architectural requirements. In order to solve the problem of insufficient lateral stiffness of the structure, the use of an outrigger truss strengthen storey was adopted. It is a representative super high-rise building structure with reinforced story and more inclined columns. Based on the incremental sensitivity optimization method, the position and number of the outrigger truss were studied and analyzed under the constraint of the story drifts. Based on the mechanics principle, the force mechanism of inclined column structure was analyzed, and the steel beams and slabs affected by inclined column were analyzed specially. The key nodes of the bifurcated column were analyzed by ABAQUS. The results show that within the range of the inclined column story, the horizontal force generated by the inclined column axial force will cause horizontal shear force in the core wall, and the tensile and compressive force characteristics are related to the inclined direction of the inclined column, columns inclined inward shall be strengthened with emphasis. The storey around the bend of the inclined column will crack when it receives a large tensile force, so the steel beam should be considered to bear the horizontal component of the inclined column independently, and check the strength carrying capacity of the member under axial force and bending moment. The inclined column turning storey, outrigger truss strengthening story and its adjacent storey are all the places where the slab stress is relatively large, so it needs to be focused and strengthened in the design. The main structure can reach the predetermined performance target after the above special analysis and the key components of the structure do not yield under the rare earthquake, and it has good ductility.
Keywords: super high-rise building; inclined column; outrigger truss strengthen story; performance-based seismic design; sensitivity analysis
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